# Flat Belly Workout Plan vs OneCheck

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.

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.

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

## The numbers

| Metric | Flat Belly Workout Plan | OneCheck |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flat-belly-workout-plan/id1574475049/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 34 MB | 15 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Samantha Roobol](https://appshunter.io/developer/1415281405) | [Maurice De Mooij](https://appshunter.io/developer/6788103406) |

## What reviewers say

### Flat Belly Workout Plan

[App page](https://appshunter.io/ios/app/flat-belly-workout-plan/id1574475049)

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:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $1.99 | one-time |
| Lose Belly Fat | $1.99 | one-time |
| Exercises for Beginners | $1.99 | one-time |
| Fat Burning HIIT Workout | $1.99 | one-time |
| Abs, Butt and Thighs | $1.99 | one-time |
| Plank Variations Exercises | $1.99 | one-time |
| Ultimate 10-Week Program | $2.99 | one-time |
| Full Bundle | $4.99 | one-time |


### OneCheck

[App page](https://appshunter.io/ios/app/onecheck-check-less/id6788103404)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OneCheck+ Monthly | $2.99 | per month |


## Frequently asked 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.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*