Cutoff — Caffeine & Sleep

Cutoff shows how much caffeine is in your body right now, and estimates a wind-down window — the range of times it typically drops below the level that starts affecting sleep. A range, not a single time, because caffeine's half-life varies from about 2 to 10 hours between people.

It also shows two different answers for when to stop drinking: one from caffeine's half-life, and one from sleep research — which points to cutting off considerably earlier. They genuinely disagree, so Cutoff shows both rather than picking a winner.

Support

Questions, bugs, or feedback: jstarcke5@gmail.com

Cutoff keeps everything on your device, so there is no account to recover and no data on a server. If something looks wrong, Settings → Export as CSV will give you your log.

Privacy

Cutoff collects nothing.

No account, no sign-in, no email.
Everything you log stays on your device. It is never uploaded.
No analytics, no crash reporting, no advertising, no tracking, no third-party SDKs.
The app contains no networking code at all — it cannot send your data anywhere.
Deleting the app deletes your data. Settings → Delete all data does the same.
If you connect Apple Health, sleep is read on-device only and never uploaded.

Because nothing leaves your device, there is nothing to sell, share, or hand over.

Full policy: privacy.html

Not medical advice

Cutoff is for general information and self-awareness. It doesn't diagnose, treat or prevent anything, and it can't tell you how you'll sleep — caffeine is one of many things that affect that. Estimates are based on a simplified pharmacokinetic model and published averages; individual metabolism varies widely. If you're pregnant, taking medication, or have questions about caffeine and your health, talk to a healthcare professional.