# Algebra I Quick Reference vs 3D Rotations and Quaternions

The clearest difference is price: 3D Rotations and Quaternions at Free against Algebra I Quick Reference's $0.99. 3D Rotations and Quaternions also leads on update cadence (every 3 weeks vs every 36 months) and device support (3 vs 1). Algebra I Quick Reference's advantage is iOS requirement (12.0 vs 15.0). On ads and in-app purchases there is nothing between them.

3D Rotations and Quaternions is free to download; Algebra I Quick Reference costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Algebra I Quick Reference ships an update every 36 months, 3D Rotations and Quaternions every 3 weeks. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Algebra I Quick Reference | 3D Rotations and Quaternions |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 3 weeks** |
| Size | 4 MB | 1 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## What reviewers say

### Algebra I Quick Reference

[App page](https://appshunter.io/ios/app/algebra-i-quick-reference/id560359498)

**Features:** macOS Compatibility

**In-app purchases:** none


### 3D Rotations and Quaternions

[App page](https://appshunter.io/ios/app/3d-rotations-and-quaternions/id6618113140)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Algebra I Quick Reference free?

Algebra I Quick Reference costs $0.99, with no in-app purchases.

### Is 3D Rotations and Quaternions free?

3D Rotations and Quaternions is free to download, with no in-app purchases.

### Do Algebra I Quick Reference or 3D Rotations and Quaternions have ads?

Neither Algebra I Quick Reference nor 3D Rotations and Quaternions shows ads.

### Which is updated more often, Algebra I Quick Reference or 3D Rotations and Quaternions?

Algebra I Quick Reference ships an update every 36 months, and 3D Rotations and Quaternions every 3 weeks. Most recently, Algebra I Quick Reference was updated on October 6, 2026 and 3D Rotations and Quaternions on October 10, 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.*