# MistakeBook vs BY My Question

MistakeBook and BY My Question are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. MistakeBook sells 1 in-app purchase, starting at $0.99 per 6 months and BY My Question sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

MistakeBook ships an update every 2 weeks, BY My Question every 9 days. The most recent releases landed on October 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | MistakeBook | BY My Question |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Size | 72 MB | 25 MB |
| Requires iOS | 18.6 | **17.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Wei Shuo Wu](https://appshunter.io/developer/527929940) | [Jia Hong Kuo](https://appshunter.io/developer/1896336194) |

## What reviewers say

### MistakeBook

[App page](https://appshunter.io/ios/app/mistakebook/id6757340127)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MistakeBook訂閱方案 | $0.99 | per 6 months |


### BY My Question

[App page](https://appshunter.io/ios/app/by-my-question/id6766905159)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50 AI 點數 | $2.99 | one-time |
| 200 AI 點數 | $9.99 | one-time |
| 500 AI 點數 | $19.99 | one-time |


## Frequently asked questions

### Is MistakeBook free?

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

### Is BY My Question free?

BY My Question is free to download, with in-app purchases available.

### Do MistakeBook or BY My Question have ads?

Neither MistakeBook nor BY My Question shows ads.

### Which is updated more often, MistakeBook or BY My Question?

MistakeBook ships an update every 2 weeks, and BY My Question every 9 days. Most recently, MistakeBook was updated on October 3, 2026 and BY My Question on October 24, 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.*