# マッスルロック vs StepOpen

The clearest difference is in-app purchases: マッスルロック at none against StepOpen's 4. StepOpen's advantage is update cadence (daily vs every 10 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. StepOpen sells 4 in-app purchases, starting at $1.99 per month. マッスルロック asks for nothing beyond the download.

マッスルロック ships an update every 10 days, StepOpen daily. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | マッスルロック | StepOpen |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 60 MB | 7 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [yuto kobayashi](https://appshunter.io/developer/1604355732) | [Takumi Shirai](https://appshunter.io/developer/6782597417) |

## What reviewers say

### マッスルロック

[App page](https://appshunter.io/ios/app/id6749794210)

This app helps combat smartphone addiction by replacing the urge to open locked apps with physical exercises. Users complete custom workouts to unlock their chosen apps for a limited time, building focus and physical strength simultaneously.

**Highlights:** Replace app usage with custom workouts, Randomized exercise missions, Timed app unlocking, Track workout progress and screen time, Customizable exercise routines, Schedule-based app locking

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

**In-app purchases:** none


### StepOpen

[App page](https://appshunter.io/ios/app/stepopen/id6782597415)

**Features:** Apple Watch app

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StepOpen Plus 月額 | $1.99 | per month |
| StepOpen Pro 月額 | $3.99 | per month |
| StepOpen Plus 年額 | $19.99 | per year |
| StepOpen Pro 年額 | $29.99 | per year |


## Frequently asked questions

### Is マッスルロック free?

マッスルロック is free to download, with no in-app purchases.

### Is StepOpen free?

StepOpen is free to download, with in-app purchases available.

### Do マッスルロック or StepOpen have ads?

Neither マッスルロック nor StepOpen shows ads.

### Which is updated more often, マッスルロック or StepOpen?

マッスルロック ships an update every 10 days, and StepOpen daily. Most recently, マッスルロック was updated on October 16, 2026 and StepOpen on October 5, 2026.

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