# DiaryTutor vs SubFit

The clearest difference is in-app purchases: DiaryTutor at none against SubFit's 2. DiaryTutor also leads on update cadence (every 3 days vs every 11 days) and iOS requirement (13.0 vs 15.0). SubFit's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. SubFit sells 2 in-app purchases, starting at $1.99 per month. DiaryTutor asks for nothing beyond the download.

DiaryTutor ships an update every 3 days, SubFit every 11 days. The most recent releases landed on August 8, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | DiaryTutor | SubFit |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 11 days |
| Size | 65 MB | 13 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YEN-HSUN LI](https://appshunter.io/developer/1894530013) | [Cheng-Gang Wang](https://appshunter.io/developer/6790284003) |

## What reviewers say

### DiaryTutor

[App page](https://appshunter.io/ios/app/diarytutor/id6762529082)

**In-app purchases:** none


### SubFit

[App page](https://appshunter.io/ios/app/subfit/id6790284001)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SubFit Plus 會員 | $1.99 | per month |
| SubFit Pro 會員 | $3.99 | per month |


## Frequently asked questions

### Is DiaryTutor free?

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

### Is SubFit free?

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

### Do DiaryTutor or SubFit have ads?

DiaryTutor shows ads; SubFit does not.

### Which is updated more often, DiaryTutor or SubFit?

DiaryTutor ships an update every 3 days, and SubFit every 11 days. Most recently, DiaryTutor was updated on August 8, 2026 and SubFit on September 26, 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.*