# 30 Day Back Ext. Challenge! vs Kenshin Note

The clearest difference is ads: Kenshin Note at none against 30 Day Back Ext. Challenge!'s shown. Kenshin Note also leads on update cadence (every 9 days vs every 3 months). 30 Day Back Ext. Challenge!'s advantage is iOS requirement (16.6 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

30 Day Back Ext. Challenge! ships an update every 3 months, Kenshin Note every 9 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 30 Day Back Ext. Challenge! | Kenshin Note |
| --- | --- | --- |
| 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 | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Ad-supported | — |
| Size | 21 MB | 8 MB |
| Requires iOS | **16.6** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [Intersect](https://appshunter.io/developer/641416964) | [Shubham Shetkar](https://appshunter.io/developer/1850275034) |

## 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


### Kenshin Note

[App page](https://appshunter.io/ios/app/kenshin-note/id6754816662)

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

**In-app purchases:** none


## 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 Kenshin Note free?

Kenshin Note is free to download, with no in-app purchases.

### Do 30 Day Back Ext. Challenge! or Kenshin Note have ads?

30 Day Back Ext. Challenge! shows ads; Kenshin Note does not.

### Which is updated more often, 30 Day Back Ext. Challenge! or Kenshin Note?

30 Day Back Ext. Challenge! ships an update every 3 months, and Kenshin Note every 9 days. Most recently, 30 Day Back Ext. Challenge! was updated on October 24, 2026 and Kenshin Note on October 25, 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.*