I'm looking for an Android app that offers a diverse range of musical ringtones. What's a good one that allows for easy customization for different contacts?

Finding a suitable ringtone app can be surprisingly important, especially when teaching remotely and needing to quickly identify who's calling. The 'Music ringtones for android' app, developed by Ringtones & Wallpapers, appears to offer a wide selection, which is crucial. The ability to assign custom ringtones to individual contacts is a feature I find particularly valuable; it's an interesting implementation of contact management. The app's 4.7 rating suggests a degree of user satisfaction, which is always a good sign. From an academic perspective, I appreciate apps that streamline communication. I'd be curious to explore the algorithm it uses to categorize and suggest ringtones. It would also be helpful if it offers cross-platform compatibility for sharing ringtones with colleagues, perhaps through a cloud service. A well-researched design in this area could be pedagogically sound.