Comparison

Flat Belly Workout Plan vs OneCheck

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

Head to head
About

Flat Belly Workout Plan

Achieve a toned stomach with a 30-day home workout plan. This app offers effective exercises to burn fat, build muscle, and define abs in just 10-20 minutes daily. See results within your first week.

Highlights
  • 30-day flat belly program
  • Daily 10-20 minute workouts
  • Home-based exercises
  • Fat burning and muscle building
  • Visible results in the first week
Features
Read full description

Whether you want a flat stomach for its aesthetic appeal or indicator of strength, you can be sure that it won’t happen without a certain amount of discipline and dedication. Luckily, there are lots of exercises you can do to burn fat, build muscle, and define your abs. If the endless lists of stomach exercises leave you unsure of which to choose, we’ve got you covered. We gathered the top flat belly exercises that you can do from the comfort of your own home in just 30 days. Each day you will need only 10 to 20 minutes of your time to perform these exercises and you will see the amazing results during your first week.

About

OneCheck

Features
Read full description

Did I lock the door? Is the stove really off? OneCheck helps you break the loop of walking back to check. Record the moment once — the key turning, the click of the lock — and when the urge to re-check comes, wait out a short mindful delay and watch your recording instead of going back. HOW IT WORKS • Capture a routine moment as a photo (or a short clip with OneCheck+) • When an urge hits, OneCheck first asks you to pause — a breathing delay you choose yourself • Then watch the recording and answer your own validation question ("Was the door really locked?") • One confirmation per recording — a new recording starts fresh, and there are no streaks or scores CALM BY DESIGN • Recordings never auto-play • "I'm not sure" gives exactly one extra viewing, never a shortcut around the delay • An urge log and reflections help you notice patterns • Export a summary for your therapist (CSV) PRIVACY FIRST Everything stays on your device. No account, no cloud, no analytics, no tracking. FREE AND PLUS The free version includes three routines with photo checks. OneCheck+ (monthly subscription) adds video recordings, unlimited routines, flows that group routines — like "Leaving the house" — and custom app icons + themes. OneCheck does not replace professional care. ``` Privacy Policy: https://mautj333.github.io/onecheck-site/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Flat Belly Workout Plan4 screens
OneCheck4 screens

Verdict

The call

The clearest difference is ads: OneCheck at none against Flat Belly Workout Plan's shown. Flat Belly Workout Plan's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price, update cadence and in-app purchases 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. Flat Belly Workout Plan sells 8 one-off in-app purchases and OneCheck sells 1 in-app purchase, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on August 25, 2026 and September 15, 2026 respectively.

Scorecard3 real differences · 6 level
Flat Belly Workout Plan versus OneCheck: the parameters behind the verdict, then further details
ParameterFlat Belly Workout PlanOneCheck
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 3 weeksEvery 3 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better17.0
Further details — not scored
Size34 MB15 MB
Age rating4+4+
DeveloperSamantha RoobolMaurice De Mooij

In-app purchases

8 purchases

Flat Belly Workout Plan

One-time8
  • Remove ads$1.99
  • Lose Belly Fat$1.99
  • Exercises for Beginners$1.99
Show 5 more
  • Fat Burning HIIT Workout$1.99
  • Abs, Butt and Thighs$1.99
  • Plank Variations Exercises$1.99
  • Ultimate 10-Week Program$2.99
  • Full Bundle$4.99
1 purchases

OneCheck

Subscriptions1
  • OneCheck+ Monthly$2.991 Month

Questions

Is Flat Belly Workout Plan free?
Flat Belly Workout Plan is free to download, with in-app purchases available.
Is OneCheck free?
OneCheck is free to download, with in-app purchases available.
Do Flat Belly Workout Plan or OneCheck have ads?
Flat Belly Workout Plan shows ads; OneCheck does not.
Which is updated more often, Flat Belly Workout Plan or OneCheck?
Flat Belly Workout Plan ships an update every 3 weeks, and OneCheck every 3 weeks. Most recently, Flat Belly Workout Plan was updated on August 25, 2026 and OneCheck on September 15, 2026.

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