Personal Project · 2026 · v1.3
CoFasting 16:8
A fasting timer built for two.
Fasting is easier with someone. Send one invite by iMessage or AirDrop and your partner joins you on the same ring — no account, no email, no password. Pick from six schedules, from 12:12 to one meal a day, and let Pip walk the lap with you. Log a meal in plain words and your phone estimates it, without uploading a thing. Your fasts stay on your device and in your own iCloud.
Fast together, not alone
New in 1.3: track water together, and hear when your partner starts or finishes a fast.
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Built for two
Send one invite by iMessage or AirDrop and your partner is on the same ring within seconds. See when they start, when they’re close, and when they finish.
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No account, ever
No sign-up, no email, no password. CoFasting links the two of you through your own iCloud, so there’s nothing to create and nothing to remember.
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Six schedules
12:12, 14:10, 16:8, 18:6, 20:4 and one meal a day. Switch whenever your week changes — travel, a late dinner, a slow Sunday.
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A lap, not a lecture
Pip walks your fasting window like a running track and passes checkpoints along the way, to make the hours more interesting to watch.
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Food notes, on device
Describe what you ate in plain words and get an estimated calorie and macro entry, worked out on your phone. Edit any number you disagree with.
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When the timer ends
An alarm you’ll actually hear, even with the ringer off. Plus a Home Screen widget and a Live Activity, so the ring is always one glance away.
Frequently Asked Questions
Is CoFasting free?
Yes, to download and use. The 16:8 schedule, the timer, your full history, unlimited food notes, the widgets, the Live Activity and CSV export are free for everyone. CoFasting Plus unlocks the other five schedules, the silent-mode finish alarm, laps that start themselves, and inviting a partner. It’s a 3-month or 12-month subscription, or a one-time purchase.
Does my partner need to pay or sign up?
No. If you have Plus you can invite a partner, and they never need to buy anything. Accepting an invitation never requires Plus, and nobody needs an account.
Where is my data stored?
On your iPhone and in your own private iCloud. There’s no CoFasting server holding your fasts, and no third-party analytics. You can export and import everything as CSV.
Is CoFasting medical advice?
No. It’s a timer and a tracking tool. The checkpoint labels are time-based educational estimates, not measurements of your body. Talk with a health professional before changing how you eat.
CoFasting is a timer and a tracking tool. It does not provide medical advice, diagnosis or treatment. Talk with a qualified health professional before changing how you eat — particularly if you are pregnant or breastfeeding, under 18, taking medication, living with a medical condition, or have a history of disordered eating.
Try CoFasting 16:8
Available now on iPhone. Free to start, no account needed, and your data stays yours.