What actually happens
Every screenshot below is real, off a test phone. The break shots were caught mid-break over Instagram, TikTok and YouTube; whatever eats your evenings, Curtail treats it the same way. In some of them the feed behind Cash is softened: that’s an optional blur setting, off by default.
1
You set the budget
Setup is eight small questions: what to call your cat, which apps, how long a sitting should last, how long a break, and whether you want a daily cap or a bedtime window. Popular time-sinks come pre-checked; everything is editable, forever, from Settings.
Your phone, messages, contacts, alarms, settings and home screen never appear in that list. Curtail asks Android which apps those are and refuses to guard them, because you might need them in an emergency.
The default is ten minutes per sitting with a five-minute break. Time in any guarded app draws from one shared budget, or you can switch on per-app timers and give each app its own.

2
You scroll, the budget drains
You use your phone normally. A few minutes before the budget runs out, a quiet notification warns you: time to finish that thread.
Then the budget hits zero, and Cash walks in over whatever you’re looking at.

3
You can watch, you can’t tap
The app keeps running underneath. Videos keep playing. But the screen belongs to Cash now: every tap lands on fur, not your feed, until the countdown ends.
Cash doesn’t nag and doesn’t lecture. He just sits there, glancing at you now and then, grooming a paw.

4
You choose what a break looks like
By default the feed stays exactly as it was: readable, playing, just untouchable. A visible feed under the cat is the whole idea.
If seeing it is the temptation, there’s an optional blur: mild takes the effort out of reading, hard melts the page into fog. Same break, same cat, your choice of view.

5
Stay long enough and he falls asleep
Give him a long break and he settles, stretches out, and sleeps on your feed. It’s the least judgmental screen-time intervention you will ever meet.

6
The break ends, or you end it
When the countdown finishes, Cash leaves and your budget resets. Or you dismiss him early, from Curtail’s notification or the app, never from the overlay itself. Having to reach somewhere else is the deliberate bit of friction: it makes autopilot pause and decide.
There’s no penalty either way. Early dismissals are the one thing your streak counts, and even that forgives one bad day a week.
The two permissions
Two permissions make the whole thing work. Here is what each one does, and what it can’t.
Usage access
What it unlocks: Curtail checks once a second which app is in the foreground, so it knows when a guarded app is open and how long you’ve been there.
What it cannot do: it can’t read what’s on your screen, see inside your apps, or read your messages. It sees an app name and a clock, nothing else. Nothing is logged off-device or transmitted; the app has no network code.
Display over other apps
What it unlocks: this is how Cash appears on top of your feed. It draws a picture over the screen, with a countdown.
What it cannot do: it can’t read, tap, record, or capture anything in the app underneath. It is a picture, sitting on top, catching your taps.
Notifications, the ordinary one
Used for the guard-status notification (which is also where the Dismiss button lives), the optional pre-limit warning, and an alert if a permission gets switched off mid-run.

The full detail lives in the privacy policy, which says the same thing in slightly more lawyerly sentences.
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