# Orthographic Projection vs MistakeBook

The clearest difference is review sentiment: MistakeBook at 100% against Orthographic Projection's 0%. MistakeBook also leads on update cadence (monthly vs every 57 months) and iOS requirement (13.0 vs 15.0). Orthographic Projection's advantage is price (Free vs $1.99) and device support (5 vs 3). On ads and in-app purchases there is nothing between them.

Orthographic Projection is free to download; MistakeBook costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Orthographic Projection ships an update every 57 months, MistakeBook monthly. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Orthographic Projection | MistakeBook |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/orthographic-projection/id1062526689/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 57 months | **Monthly** |
| Monetization | **Free** | Paid |
| Size | 384 MB | 26 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Hajdu](https://appshunter.io/developer/896377670) | [Xiamen City Fanyou Network Technology Co., Ltd.](https://appshunter.io/developer/1842524161) |

## What reviewers say

### Orthographic Projection

[App page](https://appshunter.io/ios/app/orthographic-projection/id1062526689)

Master orthographic projection with this interactive educational app. Ideal for technical students and engineers, it offers engaging ways to learn and test your skills in 1st and 3rd angle projections through fun, gamified modes. Build your knowledge and earn stars as you progress.

**Highlights:** Interactive orthographic projection learning, 1st and 3rd Angle Projection modes, Easy and Hard difficulty modes, Spatial orientation improvement, Symbolic drawing creation, 32+ parts for practice

**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 Orthographic Projection free?

Orthographic Projection is free to download, with no in-app purchases.

### Is MistakeBook free?

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

### Do Orthographic Projection or MistakeBook have ads?

Neither Orthographic Projection nor MistakeBook shows ads.

### Which is updated more often, Orthographic Projection or MistakeBook?

Orthographic Projection ships an update every 57 months, and MistakeBook monthly. Most recently, Orthographic Projection was updated on October 24, 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.*