Comparison

Fast.io vs Just Fasting

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Fast.io

Features
Read full description

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€’ One‑time purchase (no subscription) β€’ Advanced customization β€’ Extended fasting history Fast.io is designed to make intermittent fasting simple, beautiful, and effective.

About

Just Fasting

Features
Read full description

ust Fasting is built to stay out of your way. Open the app and start fastingβ€”no 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 (1–72) 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 you’ve 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

Fast.io4 screens
Just Fasting3 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Fast.io sells 1 one-off in-app purchase. Just Fasting asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard2 real differences Β· 4 level
Fast.io versus Just Fasting: the parameters behind the verdict, then further details
ParameterFast.ioJust Fasting
PriceFreeFree
Update frequencyMonthlyEvery 2 days β€” better
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, Apple WatchiPhone, iPad
Requires iOS26.0 β€” better26.4
Further details β€” not scored
Size23 MB2 MB
Age rating4+4+
DeveloperStefan SturmMatthew Clark

In-app purchases

1 purchases

Fast.io

One-time1
  • Fast.io Pro$6.99
None

Just Fasting

No in-app purchases

Questions

Is Fast.io free?
Fast.io is free to download, with in-app purchases available.
Is Just Fasting free?
Just Fasting is free to download, with no in-app purchases.
Do Fast.io or Just Fasting have ads?
Neither Fast.io nor Just Fasting shows ads.
Which is updated more often, Fast.io or Just Fasting?
Fast.io ships an update monthly, and Just Fasting every 2 days. Most recently, Fast.io was updated on October 13, 2026 and Just Fasting on October 6, 2026.

Other comparisons