# Drill.ai vs MistakeBook

The clearest difference is ads: MistakeBook at none against Drill.ai's shown. Drill.ai's advantage is update cadence (every 2 days vs every 2 weeks) and iOS requirement (15.1 vs 18.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Drill.ai sells 1 in-app purchase, starting at $9.99 per month and MistakeBook sells 1 in-app purchase, starting at $0.99 per 6 months. Whichever you choose, the download price is not the number that matters.

Drill.ai ships an update every 2 days, MistakeBook every 2 weeks. The most recent releases landed on October 10, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Drill.ai | MistakeBook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 2 weeks |
| Size | 48 MB | 72 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuta Kobayashi](https://appshunter.io/developer/1858966177) | [Wei Shuo Wu](https://appshunter.io/developer/527929940) |

## What reviewers say

### Drill.ai

[App page](https://appshunter.io/ios/app/drillai/id6756187061)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Proプラン（月額） | $9.99 | per month |


### 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 |


## Frequently asked questions

### Is Drill.ai free?

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

### Is MistakeBook free?

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

### Do Drill.ai or MistakeBook have ads?

Drill.ai shows ads; MistakeBook does not.

### Which is updated more often, Drill.ai or MistakeBook?

Drill.ai ships an update every 2 days, and MistakeBook every 2 weeks. Most recently, Drill.ai was updated on October 10, 2026 and MistakeBook on October 3, 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.*