Fasting Island
Should you keep going, or break the fast? With angel and devil on your shoulders.
A fasting companion app with a comical angel-and-devil exchange on each shoulder. Simple timer + six body-state stages explained + unlimited on-device history. Fully free, no in-app purchases — just one quiet banner ad.
Angel & Devil Series
Should you keep going, or break the fast? With angel and devil on your shoulders.
- Supported OS
- iOS 18.0+ / Android 7.0+
- Version
- 1.2.7
- Category
- Health & Fitness
- Price
- Fully free (with banner ad)
Screenshots
In the app
Features
Key features
A simple timer
Start, end, that's it. Track your fast in just two taps.
Angel & devil companions
On each shoulder, a kind voice and a devilish whisper bicker through the hours, with plenty of dialogue and occasional role reversals.
Six body-state stages explained
Digestion → glycogen depletion → fat burning → ketosis → autophagy → deep repair — each stage explains what is happening inside, with peer-reviewed PubMed papers (de Cabo 2019 / Longo 2014 / Anton 2018) cited as sources in the in-app "Learn" tab.
Unlimited history
All sessions, kept forever, on your device. A 7-day bar chart shows your streak.
Three plans
Pick the pace that fits you: 12:12 / 14:10 / 16:8.
Goal celebrations
Reach a milestone and the angel celebrates with you — gentle motivation to keep going.
Our Promise
Our pledge
Fully free
No subscriptions, no one-time purchases — there are no in-app purchases of any kind.
Banner ads only
No interstitials or video ads—only banners placed inside app screens.
Backed by research
The in-app "Learn" tab cites peer-reviewed PubMed papers (de Cabo 2019 / Longo 2014 / Anton 2018) as sources.
On-device data
Health data stays on your device. We never send it to third parties.
FAQ
Frequently asked
How many sessions can history hold?
Unlimited. Everything stays on your device, kept indefinitely.
Can I migrate history to a new device?
Automatic migration and restore from backup are not currently supported. You can export your history as CSV from Settings for safekeeping.
Are there any in-app purchases?
No. The app is fully free, with no subscriptions or one-time purchases. It uses in-screen banner ads only, with no paid ad-removal option.
What if I feel unwell?
Stop fasting immediately, take fluids, salt, and a light snack. If symptoms persist, see a healthcare provider. This app is not medical advice.
Notifications aren't coming through
iOS: Settings → Notifications → app name → enable. Android: App info → Notifications.
Get started today
Fast at your own pace, with a companion on each shoulder.
Share link
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