I use the Screen Time feature built into iOS. It looks like Android has similar capabilities:

iOS: https://support.apple.com/en-us/HT208982#:~:text=Go%20to%20S....

Android: https://support.google.com/android/answer/9346420?hl=en#zipp...

It comes standard on iOS. "Screen time" under settings.

It’s not cheap (like $99 annually) but I’ve gained a ton of time back with Opal. I think this is a referral link, but I’ve already paid for it. Founders are young, out of Paris. https://link.opal.so/D3ttGLGSF9xGFNVj7

Love this app. Funny enough I found via a Twitter ad, the only Twitter ad that's successfully converted me - https://one-sec.app/