# Herman vs MistakeBook

The clearest difference is update cadence: Herman at every 10 days against MistakeBook's monthly. MistakeBook's advantage is price ($1.99 vs $2.99) and iOS requirement (13.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

Herman costs $2.99 and MistakeBook $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Herman ships an update every 10 days, MistakeBook monthly. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Herman | MistakeBook |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/herman/id6743255218/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Monthly |
| Monetization | **Free** | Paid |
| Size | 2 MB | 26 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [H Valeur](https://appshunter.io/developer/621824042) | [Xiamen City Fanyou Network Technology Co., Ltd.](https://appshunter.io/developer/1842524161) |

## What reviewers say

### Herman

[App page](https://appshunter.io/ios/app/herman/id6743255218)

This app offers over 300 unique calculators for finance, math, and everyday problems. It provides a user-friendly interface for quick and accurate calculations, working offline for convenience.

**Highlights:** Over 300 unique calculators, Finance and business calculations, Math and fraction tools, Unit conversions (length, mass, time, volume), Offline functionality, User-friendly design

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

**In-app purchases:** none


### 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 Herman free?

Herman costs $2.99, with no in-app purchases.

### Is MistakeBook free?

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

### Do Herman or MistakeBook have ads?

Neither Herman nor MistakeBook shows ads.

### Which is updated more often, Herman or MistakeBook?

Herman ships an update every 10 days, and MistakeBook monthly. Most recently, Herman was updated on October 14, 2026 and MistakeBook on October 20, 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.*