Comparison

FastBell vs Acclimb

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

Head to head
About

FastBell

Features
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FastBell is the simplest way to start intermittent fasting. When the bell rings, eat. When it rings again, stop. Simple enough to stick with. 6 FASTING PLANS - 12:12 โ€” 12 hours fasting / 12 hours eating (free, gentle start) - 14:10 โ€” 14 hours fasting / 10 hours eating (free, easy intro) - 16:8 โ€” 16 hours fasting / 8 hours eating (most popular) - 18:6 โ€” 18 hours fasting / 6 hours eating - 20:4 โ€” 20 hours fasting / 4 hours eating - OMAD โ€” One Meal A Day (23:1) KEY FEATURES - Large countdown timer shows remaining time at a glance - Start and stop fasting with a single tap - Streak tracking to build your fasting habit - Push notifications when fasting starts and ends - Dark theme for comfortable nighttime use - Fully offline โ€” no internet required - No ads โ€” stay focused PRIVACY FIRST All data stays on your device. Nothing is ever sent to a server. FASTBELL PRO Upgrade to Pro to unlock the 16:8, 18:6, 20:4, and OMAD plans, detailed statistics, custom notifications, and widgets. 12:12 and 14:10 are free. Subscription Info: - Weekly, monthly, and yearly plans available - Billing begins after you confirm the selected plan - Payment is charged to your Apple ID account - Subscription auto-renews unless canceled at least 24 hours before the end of the current period - Manage or cancel in Settings > Apple ID > Subscriptions Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://starcrown.co.jp/privacy

About

Acclimb

Features
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Climb Mount Everest with the steps you already take. Not a progress bar dressed up as scenery โ€” an illustrated Everest that relights from dawn to midnight, drifts with high-altitude cloud, tilts with your phone, and holds your climber exactly where your body has earned. Completely free. No ads, no subscriptions, no in-app purchases. Acclimb turns your real Apple Health activity into a faithful expedition up Everest. Every flight of stairs, walk, run, hike and workout becomes vertical meters and distance along the real South Col route โ€” from Base Camp to the summit at 8,848 m. WHAT YOU GET โ€ข A living Everest scene โ€” sun-following sky, drifting cloud, parallax that answers your hand โ€ข Your route, traced โ€” Base Camp, Camp Iโ€“IV, the Balcony, the South Summit, the Hillary Step โ€ข Per-workout credit โ€” see how much that morning hike moved you up the face โ€ข Everyday stairs, counted โ€” the flights you climb without thinking about it โ€ข Two ways to climb โ€” Medium counts every metre the same; Hard thins the air near the top โ€ข Camp cinematics โ€” reach a camp and the camera moves, with a keepsake card โ€ข Route briefings and landmark cards โ€” the 1953 ascent, the Khumbu Icefall, the Death Zone โ€ข Real metrics โ€” summit ETA, 7-day trend, momentum and a daily progress chart โ€ข A permanent Summit Log โ€” every summit you reach is kept forever โ€ข Share cards โ€” rendered entirely on your device, framing the camp you reached โ€ข A global Game Center leaderboard for your highest altitude โ€” opt-in, off by default, and it shares only that one number HOW IT WORKS Real vertical counts most. Stairs and any workout that gains elevation count in full, at any pace โ€” a hilly hike always beats an hour on flat ground. A workout's own elevation already credits any stairs climbed during it, so nothing is counted twice. Choose how hard the mountain is. On Medium every metre counts the same: climb 150 m on a trail and you climb 150 m on Everest. On Hard the air thins as you go, as on the real mountain โ€” that same 150 m counts about 120 m near Camp III and about 100 m near the summit. Switch any time. Everything else still counts. Flat and indoor effort โ€” a treadmill run, a spin class, a long city walk โ€” is converted from active energy into equivalent meters and discounted, so it moves you without ever rivaling a real climb. You have to cover the ground too. Progress runs on two budgets, distance and height, and you stand at the furthest point where both are satisfied. No stair-climbing to the summit. And you can always see the math. A "What moves you up the mountain" view is one tap away and shows how every number was produced. No black box. NO STREAKS, NO GUILT There are no streaks to lose, no fail states, no red rings. Progress only ever moves forward. Take a week off and the mountain simply waits โ€” a rest day is a rest day, and Acclimb will never tell you otherwise. There is no manual "add progress" button either: your body is the only input. Turn on Reduce Motion and Acclimb honors it: the tilt-parallax stops and the sky settles almost still. YOUR HEALTH DATA STAYS YOURS Acclimb reads from Apple Health with your explicit, per-type permission, and never writes back. There is no backend, no account to create and no analytics. Only your derived progress โ€” your altitude and position on the route โ€” syncs to your own private iCloud, which only you can read. Nothing is sold, shared or used for advertising. Acclimb is declared to Apple as "Data Not Collected." The whole experience works offline. The mountain does not need a signal. Requires iOS 26 and an iPhone. Apple Health access is optional, and Acclimb needs it to move you up the mountain. Acclimb is a wellness companion and a game about your movement โ€” it is not a medical device. It does not diagnose, treat or interpret anything, and it makes no medical claims. The activity figures it shows are neutral mirrors of your own Apple Health numbers. For anything medical, consult a qualified professional.

Screenshots

FastBell3 screens
Acclimb4 screens

Verdict

The call

The clearest difference is in-app purchases: Acclimb at none against FastBell's 6. FastBell's advantage is iOS requirement (17.0 vs 26.0). On price, update cadence, ads and device support 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. FastBell sells 6 in-app purchases, starting at $0.99 per 7 days. Acclimb asks for nothing beyond the download.

UpkeepUpdate frequency

FastBell ships an update every 5 days, Acclimb every 8 days. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

Scorecard2 real differences ยท 4 level
FastBell versus Acclimb: the parameters behind the verdict, then further details
ParameterFastBellAcclimb
PriceFreeFree
Update frequencyEvery 5 days โ€” betterEvery 8 days
AdsNoNo
In-app purchasesYesNo โ€” better
DevicesiPhone, iPad โ€” betteriPhone
Requires iOS17.0 โ€” better26.0
Further details โ€” not scored
Size4 MB14 MB
Age rating+44+
DeveloperStarcrown IncRudra Jikadra

In-app purchases

6 purchases

FastBell

Subscriptions3
  • FastBell Pro Weekly3 Days trial$0.997 Days
  • Monthly Plan$2.991 Month
  • Yearly Plan$17.991 Year
One-time3
  • Coffee$0.99
  • Cookie$2.99
  • Cake$6.99
None

Acclimb

No in-app purchases

Questions

Is FastBell free?
FastBell is free to download, with in-app purchases available.
Is Acclimb free?
Acclimb is free to download, with no in-app purchases.
Do FastBell or Acclimb have ads?
Neither FastBell nor Acclimb shows ads.
Which is updated more often, FastBell or Acclimb?
FastBell ships an update every 5 days, and Acclimb every 8 days. Most recently, FastBell was updated on October 31, 2026 and Acclimb on November 6, 2026.

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