Postivo

Postivo is a calm intermittent-fasting timer for iPhone. You start a fast with one tap, watch your progress on a simple ring, and learn which stage your body is likely in as the hours pass. There is no account to create and it works fully offline.

All the classics — 12:12, 14:10, 16:8, 20:4 — plus fully custom windows, longer fasts, and open-ended fasts. You can change your schedule any time, and Postivo will suggest a starting point based on when you usually eat.

As a fast progresses, your body moves through phases such as digestion winding down and fat-burning ramping up. Postivo shows an approximate timeline with plain-language explanations. Timings vary from person to person, and the stages are educational — not a medical measurement.

Yes. Your fasts, weight, and water logs stay on your device. Postivo has no account. The app records only anonymous usage statistics (like which screens are used) that are never linked to you and never include your health data. Optional backups go to your own iCloud Drive or a file you choose — never to Pretty Toolkit servers.

Yes, optionally. You can turn on Health sync to save your weight entries and completed fasts to Apple Health. It is off by default, asks for permission first, and can be switched off at any time.

Postivo is a timer and learning companion, not medical advice. Fasting is not suitable for everyone — including people who are pregnant, under 18, or managing certain conditions. Talk to a qualified clinician before changing how you eat.