# Timer99 vs 21日で学ぶ歎異抄

The clearest difference is update cadence: Timer99 at every 2 days against 21日で学ぶ歎異抄's every 4 days. Timer99 also leads on iOS requirement (13.0 vs 17.0). On price, ads, 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.

Timer99 ships an update every 2 days, 21日で学ぶ歎異抄 every 4 days. The most recent releases landed on October 4, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Timer99 | 21日で学ぶ歎異抄 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 days |
| Size | 8 MB | 6 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Takahashi Naoto](https://appshunter.io/developer/375321356) | [Yoshihide Matsumoto](https://appshunter.io/developer/6788531770) |

## What reviewers say

### Timer99

[App page](https://appshunter.io/ios/app/timer99/id1501276905)

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

**In-app purchases:** none


### 21日で学ぶ歎異抄

[App page](https://appshunter.io/ios/app/21/id6788531768)

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

**In-app purchases:** none


## Frequently asked questions

### Is Timer99 free?

Timer99 is free to download, with no in-app purchases.

### Is 21日で学ぶ歎異抄 free?

21日で学ぶ歎異抄 is free to download, with no in-app purchases.

### Do Timer99 or 21日で学ぶ歎異抄 have ads?

Neither Timer99 nor 21日で学ぶ歎異抄 shows ads.

### Which is updated more often, Timer99 or 21日で学ぶ歎異抄?

Timer99 ships an update every 2 days, and 21日で学ぶ歎異抄 every 4 days. Most recently, Timer99 was updated on October 4, 2026 and 21日で学ぶ歎異抄 on October 7, 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.*