As the mobile app market continues to evolve, publishers are more and more keen to seek more efficient and seamless ways to monetize their apps. CastarSDK offers an innovative ad-free monetization solution, which empowers you to generate stable revenue on the basis of user activity, device online time, and more without relying on ads. Research shows that subscription models are more sustainable than ad models, which also further preserve user experience. Whether you’re developing on Android, iOS, or Windows, CastarSDK opens up new monetization opportunities for you to achieve long-term and stable revenue growth.