Comparison

JustFast vs Simple Fasting Timer

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

Head to head
About

JustFast

This app offers a straightforward intermittent fasting timer. It focuses on tracking your fast with a clear, calm interface, providing insights into metabolic stages without gamification or pressure. It prioritizes privacy with on-device data storage and no accounts.

Highlights
  • One-tap start and stop
  • Live timer with accurate timekeeping
  • Metabolic milestone tracking
  • Plain-language explanations of milestones
  • Adjustable start/stop times
  • Ongoing notification for duration
  • Simple history of past fasts
  • 18 languages and dark design
Features
Read full description

Fasting is a beautifully simple intermittent-fasting timer that does one thing well: it tracks your fast. No goals to hit. No streaks to protect. No accounts, no ads, no clutter. Just tap once to begin, and a calm live timer counts your fast while a glowing ring fills toward the next stage your body moves through. WHY IT'S DIFFERENT Most fasting apps pile on dashboards, reminders, and pressure. This one strips fasting back to its essence — a clear timer you can glance at and put away. It's designed to feel quiet and focused, not gamified. WHAT YOU GET • One-tap start and stop, with a big, satisfying button • A live timer that keeps perfect time across restarts, time-zone changes, and daylight saving • Metabolic milestones — the ring fills toward the next stage (blood sugar settling, glycogen burning, fat burning, ketosis, autophagy, and more) • Tap any milestone for an honest, plain-language explanation of what's happening in your body • Forgot to start the timer? Just tap the ring to fix your start time. Forgot to stop? End your fast at the right time after the fact. • An ongoing notification shows your current duration at a glance • A simple history of past fasts — swipe to delete • 18 languages and a clean dark design HONEST BY DESIGN The milestone descriptions are written plainly and honestly. Where the science is still early or based mostly on animal research, we say so. This app is a timer and an educational companion — not medical advice. PRIVATE BY DEFAULT Your data stays on your device. There are no accounts, no sign-ups, no tracking, and nothing is uploaded. Fasting works for 16:8, OMAD, alternate-day, extended fasts, or any schedule you like — because it never forces a schedule on you. Note: Fasting is not a medical device and does not provide medical advice. Talk to a healthcare professional before starting any fasting regimen, especially if you are pregnant, nursing, taking medication, or have a medical condition.

About

Simple Fasting Timer

Read full description

Just a fasting timer. No account, no coaching, no subscription traps. One-time purchase unlocks everything, forever. Simple Fasting Timer helps you start and track intermittent fasting windows. Free includes 16:8 and 18:6. Pro adds 20:4, OMAD, and custom fasting windows. Open the app, choose a window, start fasting, and come back anytime. What you get: - Clean fasting timer with progress ring - Live Activity and Dynamic Island support - Home Screen widget with remaining time - Local goal notification - Local fasting history and streak - Weekly fasting schedule - No account required - Works offline Pro is a one-time purchase. It unlocks advanced and custom fasting protocols, complete history and CSV export, weekly schedules, milestone reminders, all themes, and iCloud backup and restore. No subscriptions. Simple Fasting Timer is for personal wellness tracking only and is not medical advice.

Screenshots

JustFast4 screens
Simple Fasting Timer3 screens

Verdict

The call

The clearest difference is in-app purchases: JustFast at none against Simple Fasting Timer's 1. Simple Fasting Timer's advantage is update cadence (daily vs fortnightly). On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Simple Fasting Timer sells 1 one-off in-app purchase. JustFast asks for nothing beyond the download.

UpkeepUpdate frequency

JustFast ships an update fortnightly, Simple Fasting Timer daily. The most recent releases landed on September 28, 2026 and September 11, 2026 respectively.

Scorecard2 real differences · 7 level
JustFast versus Simple Fasting Timer: the parameters behind the verdict, then further details
ParameterJustFastSimple Fasting Timer
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyFortnightlyDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.6 — better
Further details — not scored
Size20 MB2 MB
Age rating4+4+
DeveloperVitalii VyrodovSerghei Eschin

In-app purchases

None

JustFast

No in-app purchases

1 purchases

Simple Fasting Timer

One-time1
  • Pro Lifetime$6.99

Questions

Is JustFast free?
JustFast is free to download, with no in-app purchases.
Is Simple Fasting Timer free?
Simple Fasting Timer is free to download, with in-app purchases available.
Do JustFast or Simple Fasting Timer have ads?
Neither JustFast nor Simple Fasting Timer shows ads.
Which is updated more often, JustFast or Simple Fasting Timer?
JustFast ships an update fortnightly, and Simple Fasting Timer daily. Most recently, JustFast was updated on September 28, 2026 and Simple Fasting Timer on September 11, 2026.

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