Comparison

Fasting interval 16 vs Fasting Clock

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

Head to head
About

Fasting interval 16

This app helps you track your intermittent fasting schedule. Simply input your fasting start time, and it will monitor your progress and notify you when your fasting interval concludes. It's designed to support your intermittent fasting journey.

Highlights
  • Intermittent fasting tracking
  • Fasting start time input
  • Fasting interval end notification
  • Supports 16:8 fasting schedule
  • Proven effectiveness support
Features
Read full description

Intermittent fasting is not a new trend. In fact, interval fasting has been well researched and its effectiveness is proven. With this app we would like to support you. Just enter the start time and the app will tell you exactly how long you've been fasting and when your fasting interval ends.

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 โ€” 16:8, 14:10, 12:12, 18:6, 20:4 or OMAD โ€” 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 โ€” end at 15.2 hours and the log says 15.2, never a rounded-up target. WHAT YOU GET โ€ข Open the app 14 hours into a 16:8 and "14:22:07 of 16h" is already on the ring โ€” the clock kept counting while the app was closed โ€ข 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 โ€ข One local reminder fires the minute your window completes โ€” no fast quietly stretching to 19 hours because you forgot it was running โ€ข A day streak, windows-met total and lifetime fast count sit under the ring every time you open the app โ€ข 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 โ€ข A 14-day bar chart shows your recorded fasting hours at a glance PERFECT FOR โ€ข 16:8 beginners who want one number, not a lifestyle program โ€ข OMAD and 20:4 practitioners who need a timer that takes long windows seriously โ€ข Anyone who quit a fasting app because it demanded an account and a weigh-in first โ€ข Shift workers whose windows move โ€” 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 โ€” 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 โ€” read the in-app safety guidance and talk to a clinician if you are unsure. FULL ACCESS FastTrkr Pro unlocks the extended protocols โ€” 18:6, 20:4, OMAD and custom targets up to 23 hours โ€” plus the 14-day hours chart. Choose a weekly or yearly subscription, or a one-time lifetime purchase. Start your first 16:8 tonight โ€” 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

Screenshots

Fasting interval 164 screens
Fasting Clock4 screens

Verdict

The call

The clearest difference is update cadence: Fasting interval 16 at weekly against Fasting Clock's every 4 months. Fasting interval 16 also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Fasting interval 16 ships an update weekly, Fasting Clock every 4 months. The most recent releases landed on October 12, 2026 and October 11, 2026 respectively.

Scorecard3 real differences ยท 5 level
Fasting interval 16 versus Fasting Clock: the parameters behind the verdict, then further details
ParameterFasting interval 16Fasting Clock
PriceFreeFree
Positive reviews50.0% of reviewsโ€”
Update frequencyWeekly โ€” betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeโ€”
DevicesiPhone, iPad, iPod โ€” betteriPhone
Requires iOS11.0 โ€” better17.0
Further details โ€” not scored
Size25 MB3 MB
Age rating12+4+
DeveloperDirk StorjohannLEAN ASIA CO., LTD

In-app purchases

None

Fasting interval 16

No in-app purchases

None

Fasting Clock

No in-app purchases

Questions

Is Fasting interval 16 free?
Fasting interval 16 is free to download, with no in-app purchases.
Is Fasting Clock free?
Fasting Clock is free to download, with no in-app purchases.
Do Fasting interval 16 or Fasting Clock have ads?
Neither Fasting interval 16 nor Fasting Clock shows ads.
Which is updated more often, Fasting interval 16 or Fasting Clock?
Fasting interval 16 ships an update weekly, and Fasting Clock every 4 months. Most recently, Fasting interval 16 was updated on October 12, 2026 and Fasting Clock on October 11, 2026.

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