# Back Ext. Counter! vs 音でわかる！腹筋カウンター

The clearest difference is in-app purchases: Back Ext. Counter! at none against 音でわかる！腹筋カウンター's 1. Back Ext. Counter! also leads on iOS requirement (16.6 vs 18.2). 音でわかる！腹筋カウンター's advantage is ads (none vs shown) and update cadence (every 4 days vs every 4 months). On price and device support there is nothing between them.

Both are free to download. 音でわかる！腹筋カウンター sells 1 one-off in-app purchase. Back Ext. Counter! asks for nothing beyond the download.

Back Ext. Counter! ships an update every 4 months, 音でわかる！腹筋カウンター every 4 days. The most recent releases landed on September 10, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Back Ext. Counter! | 音でわかる！腹筋カウンター |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 4 days** |
| Size | 31 MB | 6 MB |
| Requires iOS | **16.6** | 18.2 |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Intersect](https://appshunter.io/developer/641416964) | [Yousuke Ota](https://appshunter.io/developer/1895337148) |

## What reviewers say

### Back Ext. Counter!

[App page](https://appshunter.io/ios/app/back-ext-counter/id1365383530)

**In-app purchases:** none


### 音でわかる！腹筋カウンター

[App page](https://appshunter.io/ios/app/id6763486984)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム解放 | $0.49 | one-time |


## Frequently asked questions

### Is Back Ext. Counter! free?

Back Ext. Counter! is free to download, with no in-app purchases.

### Is 音でわかる！腹筋カウンター free?

音でわかる！腹筋カウンター is free to download, with in-app purchases available.

### Do Back Ext. Counter! or 音でわかる！腹筋カウンター have ads?

Back Ext. Counter! shows ads; 音でわかる！腹筋カウンター does not.

### Which is updated more often, Back Ext. Counter! or 音でわかる！腹筋カウンター?

Back Ext. Counter! ships an update every 4 months, and 音でわかる！腹筋カウンター every 4 days. Most recently, Back Ext. Counter! was updated on September 10, 2026 and 音でわかる！腹筋カウンター on September 20, 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.*