YONO: Your One-Stop Banking Solution YONO (You Only Need One) is a ground-breaking platform that captures the spirit of contemporary banking in a time when digital transformation is transforming the ffree slots that pay real moneyinancial services industry. YONO, a lifestyle platform that combines banking services with numerous other features, was introduced by the State Bank of India. It is not just another banking app. This cutting-edge app offers everything from account management and fund transfers to shopping & investment opportunities—all within a single interface—in an effort to meet the varied needs of its users.

Categories

• Earn App+
  • In addition, when progressive jackpot versions of Big Winner Slots are offered, players ought to take advantage of them. These games gradually build up jackpots, which frequently result in players who are fortunate enough to win life-altering sums. Players can greatly improve their overall gaming experience by combining strategic bonus and progressive jackpot use with prudent bankroll management. Big Winner Slots' jackpot system is one of its most alluring features, luring players in with the prospect of winnings that could change their lives.
  • The amount of activity users are putting into using the app is shown by engagement metrics like session length, frequency of use, and feature adoption. App developers can learn more about how well they are making money from users by utilizing monetization metrics like lifetime value (LTV) & average revenue per user (ARPU). Metrics related to virality, like referral rates & social sharing, show how effectively users are promoting the app on social media or through word-of-mouth. App developers are able to pinpoint areas that require improvement and focus their optimization efforts by routinely evaluating these performance metrics.
  • This could entail providing premium services, cutting-edge features, or exclusive content that improves user satisfaction and justifies the price. Also, to entice users to test out premium features or services prior to making a purchase or subscribing, app developers should think about implementing free trials or introductory offers. Also, in order to maximize their in-app purchase and subscription offerings, app developers should constantly evaluate user behavior and feedback. To increase conversion rates and income, this may entail testing out different price points, packaging options, and marketing techniques. App developers can create recurring revenue streams and give their users worthwhile experiences by making effective use of in-app purchases & subscriptions.
  • App developers must take user engagement, market demand, and competition into account when implementing successful app monetization strategies. App developers can customize their monetization strategies to optimize revenue and deliver value to users by comprehending their target audience and their preferences. Also, in order to maintain their competitiveness in the rapidly changing mobile app market, app developers should keep up with the most recent developments and industry best practices in app monetization.
  • This strategy guarantees that you can enjoy gaming without worrying about going over budget in addition to helping you manage your money. Players can greatly increase their chances of winning by fusing their understanding of the game with smart financial planning. A vast variety of game types that accommodate different tastes & playing styles are available in the highly diverse world of slot machines. Reminiscent of the vintage machines in physical casinos, traditional three-reel slots arouse nostalgia. The gameplay of these games is usually simple, with few paylines and basic symbols like bars and fruits.
  • App developers can look for ways to make extra money outside of the app store ecosystem in addition to varying revenue streams within the app itself. This could entail charging for goods bearing the app's name or content, providing in-app events or workshops, or licensing the technology or content for use in other apps or platforms. It could also entail offering premium services or experiences outside of the app.
  • The App Store ecosystem is a dynamic and complex setting with many different players involved, including users, platform owners like Apple and Google, and app developers. The App Store is where app developers publish and create apps, which users can download and use. Owners of platforms supply the tools and infrastructure required for developers to share their apps & for users to find and download them. App developers need to know what drives app discovery, downloads, & revenue in order to thrive in the App Store ecosystem. This entails being aware of user preferences and behavior in addition to the algorithms that app stores employ to rank and promote apps.
  • Success in the App Store ecosystem requires a thorough understanding of its many moving parts. In addition to the regulations controlling app distribution & monetization, app developers also need to understand the roles that users, platform owners, and other stakeholders play in the process. App developers can position themselves for success in the cutthroat app market by keeping up with the most recent trends and best practices in app development and marketing.
  • This resource frequently offers helpful details about typical withdrawal questions and problems. Players can find answers to their questions without requiring direct assistance by looking through this section before contacting support. But in order to guarantee a seamless withdrawal process, players must still get in touch with customer service if problems continue or if they need more explanation. In any financial transaction, security is crucial, but it's especially important in online gaming where private data is frequently shared. Strong security protocols are in place at Golden Slots Winner to safeguard players' financial and personal information while they are making withdrawals.
  • This could entail providing premium services, cutting-edge features, or exclusive content that improves user satisfaction and justifies the price. Also, to entice users to test out premium features or services prior to making a purchase or subscribing, app developers should think about implementing free trials or introductory offers. Also, in order to maximize their in-app purchase and subscription offerings, app developers should constantly evaluate user behavior and feedback. To increase conversion rates and income, this may entail testing out different price points, packaging options, and marketing techniques. App developers can create recurring revenue streams and give their users worthwhile experiences by making effective use of in-app purchases & subscriptions.
  • In order to maintain their competitiveness in the dynamic app market, developers must also keep up with the most recent trends and best practices in app marketing & development. Because breaking these guidelines can lead to the removal of the app or other consequences, app developers should be aware of the policies set forth by the platform owners. App developers can position themselves for success and optimize their app's growth and monetization potential by being aware of the various components of the App Store ecosystem and keeping up with them.
  • App developers can make money by collaborating with brands & advertisers through advertising & sponsorship opportunities, which are helpful monetization channels. Through the use of in-app advertising, one can place advertisements within an application & get paid when users interact with the ads—for example, by clicking or viewing them. App developers can also look into sponsorship opportunities, in which companies pay to have their goods or services more deeply integrated and immersively featured in the app. App developers must carefully consider factors like user experience, ad relevance, and engagement in order to make the most effective use of advertising and sponsorship opportunities. By incorporating advertisements in a way that improves rather than detracts from the user experience, it's critical to create a balance between monetization objectives & user satisfaction.
• Rummy APP+
  • Financial hardship may come to an end for some, but it may also lead to a voyage of adventure and self-discovery for others. Winners are prompted to reconsider their goals and priorities as a result of the significant win, which acts as a catalyst for change. They frequently find themselves debating how best to handle their wealth and what it means for their future as they traverse this unexplored area.
  • App developers can look for ways to make extra money outside of the app store ecosystem in addition to varying revenue streams within the app itself. This could entail charging for goods bearing the app's name or content, providing in-app events or workshops, or licensing the technology or content for use in other apps or platforms. It could also entail offering premium services or experiences outside of the app.
  • Maximize Earnings with App Downloads
  • In order to maintain their competitiveness in the dynamic app market, developers must also keep up with the most recent trends and best practices in app marketing & development. Because breaking these guidelines can lead to the removal of the app or other consequences, app developers should be aware of the policies set forth by the platform owners. App developers can position themselves for success and optimize their app's growth and monetization potential by being aware of the various components of the App Store ecosystem and keeping up with them.
  • Usually, there are two primary categories of jackpots: progressive jackpots and fixed jackpots. Regardless of the number of players or the amount wagered, fixed jackpots offer a fixed payout amount that never changes. Conversely, progressive jackpots grow gradually as players wager on the game; until someone wins it, a percentage of each wager goes toward the expanding jackpot pool. Players chase after ever-increasing sums in this dynamic, which creates an exciting atmosphere.
  • Maximize Earnings with App Downloads
  • In order to maintain their competitiveness in the dynamic app market, developers must also keep up with the most recent trends and best practices in app marketing & development. Because breaking these guidelines can lead to the removal of the app or other consequences, app developers should be aware of the policies set forth by the platform owners. App developers can position themselves for success and optimize their app's growth and monetization potential by being aware of the various components of the App Store ecosystem and keeping up with them.
  • Challenges, prizes, and leaderboards are examples of gamification features that can encourage users to use the app frequently and accomplish particular objectives. Push alerts are a useful tool for encouraging users to return to an app by providing them with pertinent updates, promotions, or reminders. App developers can improve their engagement strategies by regularly analyzing user behavior and feedback in addition to these approaches. To find the best strategies for raising user satisfaction and retention, this may entail A/B testing various engagement techniques. App developers can boost retention rates & downloads while cultivating a devoted user base that supports long-term growth by successfully engaging users.
  • This can speed up access to funds and lessen the possibility of issues with larger transactions. In order to guarantee that players have a satisfying experience when they take their winnings out of Golden Slots Winner, customer service is crucial. The platform usually provides a number of support channels, such as phone, email, and live chat. Players should not be afraid to ask for assistance if they run into problems or have inquiries about their withdrawals. Resolving issues with customer service agents promptly and effectively is frequently possible. Players should also become acquainted with Golden Slots Winner's FAQ section.
  • To increase ad relevance and effectiveness, app developers should also think about targeting ads based on user demographics, interests, & behaviors. Also, in order to maximize revenue and optimize their ad placements, app developers should keep up with the most recent trends and best practices in mobile advertising. Finding the best methods for interacting with & reaching users may require testing out various ad formats, placements, & targeting choices. App developers may diversify their revenue streams and offer value to advertisers and users at the same time by making good use of sponsorship and advertising opportunities. Since engaged users are more likely to find, download, & use an app over time, user engagement is crucial to increasing app downloads and retention.
  • This could entail providing premium services, cutting-edge features, or exclusive content that improves user satisfaction and justifies the price. Also, to entice users to test out premium features or services prior to making a purchase or subscribing, app developers should think about implementing free trials or introductory offers. Also, in order to maximize their in-app purchase and subscription offerings, app developers should constantly evaluate user behavior and feedback. To increase conversion rates and income, this may entail testing out different price points, packaging options, and marketing techniques. App developers can create recurring revenue streams and give their users worthwhile experiences by making effective use of in-app purchases & subscriptions.
  • App developers can use a variety of techniques to keep users interested, including push notifications, social features, gamification components, and personalized content recommendations. App developers can enhance user satisfaction & loyalty, which in turn drives up app downloads and retention rates, by offering an engaging and interactive app experience. Users can find relevant content or features within the app with the aid of personalized content recommendations, which are based on their preferences, actions, or previous interactions. Users' sense of community and social interaction can be fostered by social features like commenting, sharing, and multiplayer gaming, which can increase user engagement and retention.
• Disclaimer+
  • As they come to terms with the reality of their new situation, the initial euphoria may soon give way to anxiety. The Power of Luck: How It Changed the Life of a Slot Player Luck is sometimes thought of as a feisty mistress, a force that can suddenly propel someone from obscurity to prominence. When one slot player had a remarkable run of luck that permanently changed their life, this idea became a real one.
  • This could entail providing premium services, cutting-edge features, or exclusive content that improves user satisfaction and justifies the price. Also, to entice users to test out premium features or services prior to making a purchase or subscribing, app developers should think about implementing free trials or introductory offers. Also, in order to maximize their in-app purchase and subscription offerings, app developers should constantly evaluate user behavior and feedback. To increase conversion rates and income, this may entail testing out different price points, packaging options, and marketing techniques. App developers can create recurring revenue streams and give their users worthwhile experiences by making effective use of in-app purchases & subscriptions.
  • Success in the App Store ecosystem requires a thorough understanding of its many moving parts. In addition to the regulations controlling app distribution & monetization, app developers also need to understand the roles that users, platform owners, and other stakeholders play in the process. App developers can position themselves for success in the cutthroat app market by keeping up with the most recent trends and best practices in app development and marketing.
  • App developers must take user engagement, market demand, and competition into account when implementing successful app monetization strategies. App developers can customize their monetization strategies to optimize revenue and deliver value to users by comprehending their target audience and their preferences. Also, in order to maintain their competitiveness in the rapidly changing mobile app market, app developers should keep up with the most recent developments and industry best practices in app monetization.
  • While adjusting to their new circumstances, many winners struggle with identity changes. The lifestyle shifts brought on by newly acquired wealth may cause people to feel cut off from communities or old friends who may have different values or experiences. Social expectations about how wealthy people should act or spend their money can exacerbate this feeling of alienation. Because of this, it becomes essential for winners to embrace their new reality while staying rooted in and true to their core beliefs. Also, the psychological effects encompass personal well-being in addition to social dynamics.
  • App developers can look for ways to make extra money outside of the app store ecosystem in addition to varying revenue streams within the app itself. This could entail charging for goods bearing the app's name or content, providing in-app events or workshops, or licensing the technology or content for use in other apps or platforms. It could also entail offering premium services or experiences outside of the app.
  • Success in the App Store ecosystem requires a thorough understanding of its many moving parts. In addition to the regulations controlling app distribution & monetization, app developers also need to understand the roles that users, platform owners, and other stakeholders play in the process. App developers can position themselves for success in the cutthroat app market by keeping up with the most recent trends and best practices in app development and marketing.
  • App developers can use a variety of techniques to keep users interested, including push notifications, social features, gamification components, and personalized content recommendations. App developers can enhance user satisfaction & loyalty, which in turn drives up app downloads and retention rates, by offering an engaging and interactive app experience. Users can find relevant content or features within the app with the aid of personalized content recommendations, which are based on their preferences, actions, or previous interactions. Users' sense of community and social interaction can be fostered by social features like commenting, sharing, and multiplayer gaming, which can increase user engagement and retention.
  • When you hit a set loss threshold, for example, it's better to walk away rather than trying to recover your losses. On the other hand, rather than playing with all of your winnings on the line after striking it rich, think about cashing out a portion of your winnings. By taking a balanced approach, you can avoid taking on too much risk with your bankroll while still having fun while playing the slots.
  • This could entail providing premium services, cutting-edge features, or exclusive content that improves user satisfaction and justifies the price. Also, to entice users to test out premium features or services prior to making a purchase or subscribing, app developers should think about implementing free trials or introductory offers. Also, in order to maximize their in-app purchase and subscription offerings, app developers should constantly evaluate user behavior and feedback. To increase conversion rates and income, this may entail testing out different price points, packaging options, and marketing techniques. App developers can create recurring revenue streams and give their users worthwhile experiences by making effective use of in-app purchases & subscriptions.
  • App developers can look for ways to make extra money outside of the app store ecosystem in addition to varying revenue streams within the app itself. This could entail charging for goods bearing the app's name or content, providing in-app events or workshops, or licensing the technology or content for use in other apps or platforms. It could also entail offering premium services or experiences outside of the app.
  • The amount of activity users are putting into using the app is shown by engagement metrics like session length, frequency of use, and feature adoption. App developers can learn more about how well they are making money from users by utilizing monetization metrics like lifetime value (LTV) & average revenue per user (ARPU). Metrics related to virality, like referral rates & social sharing, show how effectively users are promoting the app on social media or through word-of-mouth. App developers are able to pinpoint areas that require improvement and focus their optimization efforts by routinely evaluating these performance metrics.
• Disclaimer+
  • This resource frequently offers helpful details about typical withdrawal questions and problems. Players can find answers to their questions without requiring direct assistance by looking through this section before contacting support. But in order to guarantee a seamless withdrawal process, players must still get in touch with customer service if problems continue or if they need more explanation. In any financial transaction, security is crucial, but it's especially important in online gaming where private data is frequently shared. Strong security protocols are in place at Golden Slots Winner to safeguard players' financial and personal information while they are making withdrawals.
  • Users who are willing to pay for extra features, content, or services within the app can become revenue producers for app developers through in-app purchases and subscriptions, two effective monetization strategies. Subscriptions provide users with ongoing access to premium content or services, whereas in-app purchases usually involve one-time transactions for virtual goods or premium features. Apps like productivity, entertainment, and gaming apps—which provide users with continuous value or utility—benefit greatly from these monetization strategies. App developers must carefully craft their offerings to offer users compelling value if they hope to successfully leverage in-app purchases and subscriptions.
  • The App Store ecosystem is a dynamic and complex setting with many different players involved, including users, platform owners like Apple and Google, and app developers. The App Store is where app developers publish and create apps, which users can download and use. Owners of platforms supply the tools and infrastructure required for developers to share their apps & for users to find and download them. App developers need to know what drives app discovery, downloads, & revenue in order to thrive in the App Store ecosystem. This entails being aware of user preferences and behavior in addition to the algorithms that app stores employ to rank and promote apps.
  • The display of advertisements within an app and the revenue generated from user interaction with these ads make up another well-liked monetization technique. Also, sponsors can pay for their products or services to be featured in an app; app developers can investigate these opportunities. Through affiliate marketing, app developers can also make money by promoting third-party goods and services inside the app and getting paid a commission for each lead or sale that is created.
  • Gamers need to improve their ability to read the table, predict the moves of their opponents, and make well-informed decisions even when they don't have all the facts. In order to reduce their opponents' chances of creating winning combinations, the top rummy players know when to discard cards & when to hold onto them for possible future melds. Also, the abilities needed for rummy go beyond simple card management; they also include psychological savvy and emotional intelligence. Players must maintain composure under duress, particularly in high-stakes games where every choice they make could have a big effect on the result.
  • App developers must take user engagement, market demand, and competition into account when implementing successful app monetization strategies. App developers can customize their monetization strategies to optimize revenue and deliver value to users by comprehending their target audience and their preferences. Also, in order to maintain their competitiveness in the rapidly changing mobile app market, app developers should keep up with the most recent developments and industry best practices in app monetization.
  • App developers must take user engagement, market demand, and competition into account when implementing successful app monetization strategies. App developers can customize their monetization strategies to optimize revenue and deliver value to users by comprehending their target audience and their preferences. Also, in order to maintain their competitiveness in the rapidly changing mobile app market, app developers should keep up with the most recent developments and industry best practices in app monetization.
  • App developers can use a variety of tactics to effectively monetize their apps. App monetization is the process of making money from mobile apps. A popular method of app monetization is the freemium model, which provides a free version of the app along with the option to subscribe to premium features or content through in-app purchases. By offering their apps for free, developers can draw in a sizable user base & make money from those who are prepared to pay for more features or content.
  • This can speed up access to funds and lessen the possibility of issues with larger transactions. In order to guarantee that players have a satisfying experience when they take their winnings out of Golden Slots Winner, customer service is crucial. The platform usually provides a number of support channels, such as phone, email, and live chat. Players should not be afraid to ask for assistance if they run into problems or have inquiries about their withdrawals. Resolving issues with customer service agents promptly and effectively is frequently possible. Players should also become acquainted with Golden Slots Winner's FAQ section.
  • App developers can build a more resilient business model that lowers risk & optimizes growth potential by strategically varying revenue streams. This might entail keeping up with the most recent trends and industry best practices in mobile monetization while carefully weighing various monetization strategies in light of user preferences and market demand. App developers can build a more resilient business model that adjusts to shifting market conditions and maximizes overall revenue potential by strategically diversifying revenue streams both inside and outside of the app store ecosystem. To sum up, being aware of the App Store ecosystem is essential for being successful in the cutthroat world of mobile applications.
  • To increase ad relevance and effectiveness, app developers should also think about targeting ads based on user demographics, interests, & behaviors. Also, in order to maximize revenue and optimize their ad placements, app developers should keep up with the most recent trends and best practices in mobile advertising. Finding the best methods for interacting with & reaching users may require testing out various ad formats, placements, & targeting choices. App developers may diversify their revenue streams and offer value to advertisers and users at the same time by making good use of sponsorship and advertising opportunities. Since engaged users are more likely to find, download, & use an app over time, user engagement is crucial to increasing app downloads and retention.
  • App developers can build a more resilient business model that lowers risk & optimizes growth potential by strategically varying revenue streams. This might entail keeping up with the most recent trends and industry best practices in mobile monetization while carefully weighing various monetization strategies in light of user preferences and market demand. App developers can build a more resilient business model that adjusts to shifting market conditions and maximizes overall revenue potential by strategically diversifying revenue streams both inside and outside of the app store ecosystem. To sum up, being aware of the App Store ecosystem is essential for being successful in the cutthroat world of mobile applications.
• Rummy APP+
  • One typical reflection is the understanding that luck is erratic and that, despite its capacity to alter lives in an instant, it should not be taken for granted. As they realize how each experience has molded them into the person they are today, many winners grow to feel a deep sense of gratitude for all of their experiences, both positive & negative. This renewed understanding frequently inspires people to approach opportunities and challenges in life with greater mindfulness. The value of resilience in navigating both luck and misfortune is another lesson that winners usually acquire. They learn from the experience that material wealth is not the same as happiness & that genuine fulfillment stems from developing oneself, making meaningful connections, and giving back to the community. Looking back on their journey, many discover that they are dedicated to living genuinely and purposefully—not just indulging in excesses, but using their good fortune as a springboard for constructive change.
  • The display of advertisements within an app and the revenue generated from user interaction with these ads make up another well-liked monetization technique. Also, sponsors can pay for their products or services to be featured in an app; app developers can investigate these opportunities. Through affiliate marketing, app developers can also make money by promoting third-party goods and services inside the app and getting paid a commission for each lead or sale that is created.
  • This could be improving features or content in response to user feedback, experimenting with various monetization techniques to increase income, or honing marketing strategies to increase user acquisition. App developers can maximize their apps' potential for success and promote sustainable growth by methodically optimizing app performance metrics. For app developers to minimize their dependency on a single monetization strategy & optimize their total revenue potential, they must diversify their sources of income. Through a variety of revenue-generating options, including in-app purchases, subscriptions, advertising, sponsorships, and affiliate marketing, app developers can build a more flexible business model that can adjust to shifting user preferences and market conditions.
  • The amount of activity users are putting into using the app is shown by engagement metrics like session length, frequency of use, and feature adoption. App developers can learn more about how well they are making money from users by utilizing monetization metrics like lifetime value (LTV) & average revenue per user (ARPU). Metrics related to virality, like referral rates & social sharing, show how effectively users are promoting the app on social media or through word-of-mouth. App developers are able to pinpoint areas that require improvement and focus their optimization efforts by routinely evaluating these performance metrics.
  • As they come to terms with the reality of their new situation, the initial euphoria may soon give way to anxiety. The Power of Luck: How It Changed the Life of a Slot Player Luck is sometimes thought of as a feisty mistress, a force that can suddenly propel someone from obscurity to prominence. When one slot player had a remarkable run of luck that permanently changed their life, this idea became a real one.
  • Maximize Earnings with App Downloads
  • The amount of activity users are putting into using the app is shown by engagement metrics like session length, frequency of use, and feature adoption. App developers can learn more about how well they are making money from users by utilizing monetization metrics like lifetime value (LTV) & average revenue per user (ARPU). Metrics related to virality, like referral rates & social sharing, show how effectively users are promoting the app on social media or through word-of-mouth. App developers are able to pinpoint areas that require improvement and focus their optimization efforts by routinely evaluating these performance metrics.
  • App developers can make money by collaborating with brands & advertisers through advertising & sponsorship opportunities, which are helpful monetization channels. Through the use of in-app advertising, one can place advertisements within an application & get paid when users interact with the ads—for example, by clicking or viewing them. App developers can also look into sponsorship opportunities, in which companies pay to have their goods or services more deeply integrated and immersively featured in the app. App developers must carefully consider factors like user experience, ad relevance, and engagement in order to make the most effective use of advertising and sponsorship opportunities. By incorporating advertisements in a way that improves rather than detracts from the user experience, it's critical to create a balance between monetization objectives & user satisfaction.
  • Slot games, on the one hand, are essentially based on chance; random number generators (RNGs) decide the results, making every spin distinct and unpredictable. Because of this randomness, no amount of strategy or skill can ensure a win on any particular spin. Components of Skill in Big Winner Slot Machine Play. It is possible for players to be at the mercy of chance when it comes to triggering bonus features or hitting winning combinations. To play Big Winner Slots successfully, though, you need to have some skill.
  • App developers must evaluate and refine app performance metrics in order to assess their apps' current state and pinpoint areas in need of development. Key performance metrics such as user acquisition, retention, engagement, monetization, and virality provide valuable insights into how users are interacting with the app & where opportunities for optimization exist. Through consistent monitoring of these metrics and data-driven decision-making, app developers can optimize their apps' performance and increase their growth and revenue potential. App developers can assess the efficacy of their marketing campaigns to acquire new users by utilizing user acquisition metrics like conversion rates and charge per install (CPI). Churn rate and cohort analysis are examples of retention metrics that provide information about how well an app is keeping users over time.
  • The App Store ecosystem is a dynamic and complex setting with many different players involved, including users, platform owners like Apple and Google, and app developers. The App Store is where app developers publish and create apps, which users can download and use. Owners of platforms supply the tools and infrastructure required for developers to share their apps & for users to find and download them. App developers need to know what drives app discovery, downloads, & revenue in order to thrive in the App Store ecosystem. This entails being aware of user preferences and behavior in addition to the algorithms that app stores employ to rank and promote apps.
  • App developers must evaluate and refine app performance metrics in order to assess their apps' current state and pinpoint areas in need of development. Key performance metrics such as user acquisition, retention, engagement, monetization, and virality provide valuable insights into how users are interacting with the app & where opportunities for optimization exist. Through consistent monitoring of these metrics and data-driven decision-making, app developers can optimize their apps' performance and increase their growth and revenue potential. App developers can assess the efficacy of their marketing campaigns to acquire new users by utilizing user acquisition metrics like conversion rates and charge per install (CPI). Churn rate and cohort analysis are examples of retention metrics that provide information about how well an app is keeping users over time.