What's the best Android app for relaxing with paint-by-numbers?

Color Aura is a well-regarded paint-by-numbers app designed specifically for relaxation and creative focus. Its core appeal lies in offering a digital alternative to physical coloring books, with a library that receives daily updates. Users can select from a wide array of categories, including animals, landscapes, and mandalas, with each image clearly segmented into numbered sections. The difficulty ranges significantly, allowing beginners to tackle simpler designs while offering complex, detailed canvases for more experienced users seeking deeper immersion. A tap-to-fill control scheme makes the process intuitive, and a hint system can assist with particularly crowded areas. For consistent use, the app provides a daily free picture and a reward system for logging in. However, some user feedback indicates a desire for a one-time purchase option to remove ads and unlock unlimited hints, as the current model relies on watching ads or using earned coins for these features. Reviews frequently highlight the image quality and the app's effectiveness as a replacement for other discontinued coloring apps, making it a strong candidate for those seeking a low-stakes, meditative activity.