FocusMe works well
Android
DROID DOES
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This is built into Android now. It's called "private space". It's in the "security and privacy" settings.
Most I can find the there is the before mentioned Private Folder?
What Android version are you on?
Android 16, One UI 8
Dunno if it is an android 16 feature or a crdroid feature, but I have this:

Android's "Work Profile" feature provides you a sandbox, allowing you to isolate "work" apps from your regular phone apps. I've never used Samsung's secure folder, but it looks like the two are similar.
"Shelter" (Available on F-Droid) provides an easy way to setup and manage your work profile.
With the work profile set up, you can lock the work profile behind a separate password. (Settings -> Security & Privacy -> More security & privacy. Disable "Use one lock" and set a password)
Can confirm secure folder, that's how I use it. And it's neat that you can rename it and give it a different icon. Mine is "Settings" with a cog icon.
i've used "digital detox" for this: https://play.google.com/store/apps/details?id=com.urbandroid.ddc
now i have a physical timer lock box to lock away the whole phone.
No, but I just use a browser for everything. That alters my habits quite a bit. The apps are optimised for retention. When I'm in a browser, it just hits different for me, like I'm going to a public commons versus some lord or the rings magic jewelry kept in my digital pocket. It is not a thing I own, or am a part of in a tribalistic sense.