Fast.io vs Just Fasting
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Fast.io
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Fast.io is a beautifully simple intermittent fasting timer designed to help you stay consistent and focused on your fasting goals. Track your fast in real time, monitor hydration, and stay motivated with clear insights, widgets, and Live Activities. Perfect for popular fasting schedules like **16:8, 18:6, or OMAD**. #### TRACK YOUR FAST β’ Start fasting sessions with presets like 16:8, 18:6, or create custom fasting intervals β’ See elapsed time, remaining time, and fasting phases\ β’ Follow your fasting progress in real time #### TRACK YOUR WEIGHT β’ Sync weight with Apple Health β’ Monitor weight changes during fasting β’ Understand how fasting affects your body #### STAY CONSISTENT β’ Local reminders for fasting milestones β’ Daily hydration tracking β’ Motivation through achievements and streaks #### SEE YOUR PROGRESS β’ History with notes and mood tracking β’ Weekly, monthly, and yearly statistics β’ Understand and improve your fasting habits #### BUILT FOR APPLE DEVICES β’ Live Activities and Dynamic Island β’ Home Screen and Lock Screen widgets β’ Apple Watch companion app #### PRO FEATURES β’ Oneβtime purchase (no subscription) β’ Advanced customization β’ Extended fasting history Fast.io is designed to make intermittent fasting simple, beautiful, and effective.
Just Fasting
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ust Fasting is built to stay out of your way. Open the app and start fastingβno clutter, no noise. Start fasts your way β’ 16-hour fast β one tap, last meal is now (adjust if you need to). β’ Custom fast β pick hours (1β72) or longer fasts in days (4+), with no upper limit on days in the picker. β’ Last meal time defaults to now but you can change it if you finished eating earlier. Stay oriented A large countdown and an arc show how far youβve come through your fast. When you hit your goal, wrap up with a tap. See your progress Statistics include total fasts, total time fasted, average length, longest fast, current streak, and best streak. The app remembers your last fast length so starting the same routine again is quick.
Screenshots
Verdict
The clearest difference is in-app purchases: Just Fasting at none against Fast.io's 1. Just Fasting also leads on update cadence (every 2 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Fast.io sells 1 one-off in-app purchase. Just Fasting asks for nothing beyond the download.
Fast.io ships an update monthly, Just Fasting every 2 days. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.
| Parameter | Fast.io | Just Fasting |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Every 2 days β better |
| Ads | No | No |
| In-app purchases | Yes | No β better |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Requires iOS | 26.0 β better | 26.4 |
| Further details β not scored | ||
| Size | 23 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Stefan Sturm | Matthew Clark |
In-app purchases
Fast.io
- Fast.io Pro$6.99
Just Fasting
No in-app purchases









