# 三省 vs Review Diary

The clearest difference is in-app purchases: Review Diary at none against 三省's 3. Review Diary also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 三省 sells 3 in-app purchases, starting at $2.99 per month. Review Diary asks for nothing beyond the download.

三省 ships an update every 6 months, Review Diary every 5 months. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | 三省 | Review Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/id6470999911/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 months** |
| Monetization | Free with in-app purchases | — |
| Size | 30 MB | 12 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [嘉达 黄](https://appshunter.io/developer/1708566399) | [嵩 欧阳](https://appshunter.io/developer/1832764725) |

## What reviewers say

### 三省

[App page](https://appshunter.io/ios/app/id6470999911)

This cognitive tool uses cards for recording, reviewing, and self-dialogue to aid memory and clear thinking. It offers flexible input methods, knowledge networking, and visual mind mapping to enhance understanding and reflection.

**Highlights:** Card input (typing & handwriting), Bidirectional knowledge linking, Visual mind maps, Self-dialogue mechanism, Spaced repetition review, Cognitive graph building

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThreeTimes - Monthly Plan | $2.99 | per month |
| ThreeTimes - Yearly Plan | $4.99 | per year |
| ThreeTimes - Lifetime Plan | $9.99 | one-time |


### Review Diary

[App page](https://appshunter.io/ios/app/review-diary-time-management/id6756975727)

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

**In-app purchases:** none


## Frequently asked questions

### Is 三省 free?

三省 is free to download, with in-app purchases available.

### Is Review Diary free?

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

### Do 三省 or Review Diary have ads?

Neither 三省 nor Review Diary shows ads.

### Which is updated more often, 三省 or Review Diary?

三省 ships an update every 6 months, and Review Diary every 5 months. Most recently, 三省 was updated on October 16, 2026 and Review Diary on October 14, 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.*