# 稳了! vs MistakeBook

The clearest difference is price: 稳了! at Free against MistakeBook's $1.99. 稳了! also leads on update cadence (daily vs monthly). MistakeBook's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

稳了! is free to download; MistakeBook costs $1.99 up front. 稳了! sells 1 in-app purchase, starting at $2.99 per month. MistakeBook asks for nothing beyond the download.

稳了! ships an update daily, MistakeBook monthly. The most recent releases landed on September 2, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | 稳了! | MistakeBook |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Monthly |
| Monetization | — | Paid |
| Size | 30 MB | 26 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [探渊科技](https://appshunter.io/developer/1814267710) | [Xiamen City Fanyou Network Technology Co., Ltd.](https://appshunter.io/developer/1842524161) |

## What reviewers say

### 稳了!

[App page](https://appshunter.io/ios/app/ai/id6754680276)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度订阅 | $2.99 | per month |


### MistakeBook

[App page](https://appshunter.io/ios/app/mistakebook-wrong-answer-log/id6770173206)

Log and review incorrect answers to improve learning. Organize mistakes by subject and topic, and utilize spaced repetition to reinforce weak areas. Track progress with visual charts and daily check-ins for effective test preparation.

**Highlights:** Log mistakes with photos and notes, Organize by subject and custom tags, Spaced repetition review mode, Ebbinghaus forgetting curve schedule, Progress charts and stats dashboard, Data import/export backup

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

**In-app purchases:** none


## Frequently asked questions

### Is 稳了! free?

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

### Is MistakeBook free?

MistakeBook costs $1.99, with no in-app purchases.

### Do 稳了! or MistakeBook have ads?

Neither 稳了! nor MistakeBook shows ads.

### Which is updated more often, 稳了! or MistakeBook?

稳了! ships an update daily, and MistakeBook monthly. Most recently, 稳了! was updated on September 2, 2026 and MistakeBook on September 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*