Comparison

Fasting Clock vs FastJoy

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

Head to head
About

Fasting Clock

Features
Read full description

Start a fasting timer, close the app, and trust the number when you come back. FastTrkr tracks your intermittent fasting window β€” 16:8, 14:10, 12:12, 18:6, 20:4 or OMAD β€” shows elapsed time against your target, then counts down the eating window that follows. Most fasting apps want your email, your weight, your meal photos and a coaching plan. FastTrkr is the opposite: a precise fasting clock with an honest log. The timer is anchored to your iPhone's continuous system clock, so elapsed time stays correct through reboots, timezone changes and clock adjustments. And it records the hours that actually ran β€” end at 15.2 hours and the log says 15.2, never a rounded-up target. WHAT YOU GET β€’ Open the app 14 hours into a 16:8 and "14:22:07 of 16h" is already on the ring β€” the clock kept counting while the app was closed β€’ End the fast and an eating-window countdown takes its place, so you know dinner has to land inside the next 7 hours 40 minutes β€’ One local reminder fires the minute your window completes β€” no fast quietly stretching to 19 hours because you forgot it was running β€’ A day streak, windows-met total and lifetime fast count sit under the ring every time you open the app β€’ Tapped End by accident at hour 3? Edit the start and end times and the session is corrected, with a note field for how it felt β€’ A 14-day bar chart shows your recorded fasting hours at a glance PERFECT FOR β€’ 16:8 beginners who want one number, not a lifestyle program β€’ OMAD and 20:4 practitioners who need a timer that takes long windows seriously β€’ Anyone who quit a fasting app because it demanded an account and a weigh-in first β€’ Shift workers whose windows move β€” custom hour targets when the standard presets don't fit WHY NOT JUST USE THE CLOCK APP? A plain timer forgets everything when it ends, loses your fast when the phone reboots, and knows nothing about eating windows. FastTrkr survives a reboot mid-fast, logs every session to an editable history, keeps your streak, and tells you when the eating window closes β€” things a stopwatch will never do. PRIVATE BY DEFAULT No account, no analytics, no ads, no server. Every session is stored on your iPhone and the app works fully offline. Nothing you record ever leaves the device. FastTrkr is a timer, not medical advice. Fasting is not suitable for everyone β€” read the in-app safety guidance and talk to a clinician if you are unsure. FULL ACCESS FastTrkr Pro unlocks the extended protocols β€” 18:6, 20:4, OMAD and custom targets up to 23 hours β€” plus the 14-day hours chart. Choose a weekly or yearly subscription, or a one-time lifetime purchase. Start your first 16:8 tonight β€” by breakfast the ring will tell you exactly where you stand. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia

About

FastJoy

Features
Read full description

FastJoy is the simple, private way to track intermittent fasting. Pick a protocol, start the timer, and watch your fasting and eating windows in real time β€” no account, no paywall on the core timer, and everything stays on your device. WHY FASTWINDOW - Beautiful animated fasting timer with live elapsed time and progress ring - Choose 16:8, 18:6, 20:4, OMAD or a custom fasting window - Informational fasting stages as the hours add up (fat burning, ketosis, autophagy zone) - Current streak, today's eating window and target end time at a glance - Edit your start time anytime β€” perfect when you forget to hit start TRACK EVERYTHING - Full history of every fast with met-goal status - GitHub-style consistency heatmap of your fasting days - Weekly fasting hours and calendar overview STATS & PROGRESS - Average fast length, longest fast, completion rate and streaks - Fast-duration trend chart and this-week-vs-last comparison - Patterns by weekday and start time of day - Optional weight log with a clean trend chart - Dozens of achievements to keep you motivated REMINDERS THAT HELP - Get notified the moment your fasting goal is reached - Optional "time to start fasting" and hydration reminders - 100% local notifications β€” no servers, no tracking of your habits PRIVATE BY DESIGN - No sign-up, works fully offline - Optional Face ID / Touch ID lock - Export and import your data as JSON anytime - Available in English, Spanish, French, Italian, German and Portuguese FastJoy is a tracking aid only and does not provide medical or nutritional advice. Intermittent fasting is not suitable for everyone, including during pregnancy or with certain medical conditions. Consult a qualified healthcare professional before changing your eating patterns. Start your first fast today and build a routine that lasts.

Screenshots

Fasting Clock4 screens
FastJoy4 screens

Verdict

The call

The clearest difference is ads: Fasting Clock at none against FastJoy's shown. FastJoy's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

Scorecard3 real differences Β· 3 level
Fasting Clock versus FastJoy: the parameters behind the verdict, then further details
ParameterFasting ClockFastJoy
PriceFreeFree
Update frequencyEvery 4 monthsβ€”
AdsNo β€” betterYes
In-app purchasesNoNo
DevicesiPhoneiPhone, iPad, iPod β€” better
Requires iOS17.013.0 β€” better
Further details β€” not scored
Size3 MB41 MB
Age rating4+12+
DeveloperLEAN ASIA CO., LTDFerran Espuna

In-app purchases

None

Fasting Clock

No in-app purchases

None

FastJoy

No in-app purchases

Questions

Is Fasting Clock free?
Fasting Clock is free to download, with no in-app purchases.
Is FastJoy free?
FastJoy is free to download, with no in-app purchases.
Do Fasting Clock or FastJoy have ads?
FastJoy shows ads; Fasting Clock does not.

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