# 30 Day Back Ext. Challenge! vs ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ

The clearest difference is in-app purchases: 30 Day Back Ext. Challenge! at none against ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ's 1. ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ's advantage is review sentiment (67% vs 46%) and update cadence (every 3 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ sells 1 in-app purchase, starting at $7.99 per month. 30 Day Back Ext. Challenge! asks for nothing beyond the download.

30 Day Back Ext. Challenge! ships an update every 3 months, ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ every 3 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | 30 Day Back Ext. Challenge! | ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/30-day-back-ext-challenge/id1435562187/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 46.2% of reviews | **66.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 21 MB | 44 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Intersect](https://appshunter.io/developer/641416964) | [MEDIASEEK Inc.](https://appshunter.io/developer/333911151) |

## What reviewers say

### 30 Day Back Ext. Challenge!

[App page](https://appshunter.io/ios/app/30-day-back-ext-challenge/id1435562187)

This app helps you track your daily back extensions for a 30-day challenge. It allows you to count your exercises, manage your progress, and receive notifications. You can also record active energy and workouts to Apple Health.

**Highlights:** Count back extensions daily, Manage achievement days, Receive notifications, Record active energy, Sync with Apple Health, Track workouts

**In-app purchases:** none


### ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ

[App page](https://appshunter.io/ios/app/id1609839995)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $7.99 | per month |


## Frequently asked questions

### Is 30 Day Back Ext. Challenge! free?

30 Day Back Ext. Challenge! is free to download, with no in-app purchases.

### Is ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ free?

ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ is free to download, with in-app purchases available.

### Do 30 Day Back Ext. Challenge! or ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ have ads?

Both 30 Day Back Ext. Challenge! and ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ show ads.

### Which is updated more often, 30 Day Back Ext. Challenge! or ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ?

30 Day Back Ext. Challenge! ships an update every 3 months, and ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ every 3 weeks. Most recently, 30 Day Back Ext. Challenge! was updated on October 24, 2026 and ダイエット・筋トレアプリ：カリスマトレーナー岡部友の宅トレ on October 27, 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.*