Datally was a data-saving app that allowed users to monitor the data apps used and shut it down whenever necessary to save on data charges.
Google silently removed the app from Play Store in 2019, as first reported by Android Police. They haven’t come up with an official statement, other than that the app won’t function on Android 10.
The common presumption is that the app was proved redundant by Android features. The app was mainly aimed at users from developing countries since the data charges there are expensive. However, more and more smartphones can track data usage and turn it off for specific apps. The cost of data has also been decreasing, so apps such as Datally are no longer targeting an acute pain point.
For those who don’t have a pre installed option on their device, or prefer an additional app to manage their data usage, there are still some good choices such as DataEye (which is free but have some ads), or GlassWire (which has premium options for up to $9.99/month)