# Fenster: Fasting Timer

> 16:8 & Intermittent

Canonical page: [https://chrome-stats.com/d/id6801228469](https://chrome-stats.com/d/id6801228469)

## Overview

- **ID:** `id6801228469`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Mihael Bosnjak
- **Category:** Health & Fitness
- **Version:** 1.0
- **Last updated:** 2026-09-11
- **First published:** 2026-09-11
- **Size:** 1.53 MB
- **Data as of:** 2026-09-14
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/fenster-fasting-timer/id6801228469)
- **Website:** [https://fenster.bosnjak.io](https://fenster.bosnjak.io/)
- **Privacy policy:** [https://fenster.bosnjak.io/privacy.html](https://fenster.bosnjak.io/privacy.html)

## Description

A fasting clock. Hours on, hours off. No streaks, no scores, no invented biology. Your data stays on your phone.

Fenster is a fasting clock. You open a window, you close a window. That is the whole app, done properly.

THE CLOCK
Pick a protocol: 16:8 and 12:12 free forever, 14:10, 18:6, 20:4, OMAD, and custom hours with the lifetime unlock. The ring counts your window. Go past your target and the clock counts overtime instead of pretending you finished.

HONEST BY DESIGN
No streaks. No scores. No "fat-burning zones." No ketosis claims a clock cannot measure. Fasting stages are shown as rough bands with real physiology and honest limits, because your body is not a progress bar.

EVERYWHERE
Home screen widget with the live ring. Dynamic Island and Lock Screen Live Activity. Siri, Shortcuts, the Action Button, and a Control Center control: start a fast without opening the app. Close a finished window straight from the notification.

APPLE HEALTH, MINIMALLY
Health can fill your profile (age, height, weight). Fenster writes exactly one thing back: the weight you choose to save. Fasts stay in Fenster. Apple has no fasting type, and we do not invent one.

SAFETY FIRST
Clear guidance about who should not fast, visible stop rules, a gentler mode with shorter windows, and a check-in if a window stays open too long. Fenster is a clock, not a clinic.

PRIVATE
No account. No tracking. No servers. Your data lives on your device, in English and German. More languages coming.

One optional payment. $9.99, lifetime, done.

## Rankings

- #1,335,389 — Overall

## Similar extensions and apps

- [FastWindow: Fasting Timer](https://chrome-stats.com/d/id6764386746)
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- [My Fasting Timer: IF Clock](https://chrome-stats.com/d/id6759697468) — 4.60 / 5
- [FastWindow: Fasting Log](https://chrome-stats.com/d/id6788596590)
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- [Fasting Clock: Timer & Streaks](https://chrome-stats.com/d/id6757719151)
- [Fasting Tracker & 16:8 Timer](https://chrome-stats.com/d/id6806782372)
- [Moonfast](https://chrome-stats.com/d/id6799545081) — 5.00 / 5
- [Fastwell: Intermittent Fasting](https://chrome-stats.com/d/id6789995014)
- [Fastly - Fast Timer & Tracker](https://chrome-stats.com/d/id6762475115) — 5.00 / 5
- [Window - Fasting Timer](https://chrome-stats.com/d/id6757469789) — 5.00 / 5
- [Faast - Fasting Timer](https://chrome-stats.com/d/id6787727897)

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6801228469)