# RustAcademy vs Opcodes

The clearest difference is price: Opcodes at Free against RustAcademy's $5.99. Opcodes also leads on update cadence (every 8 days vs every 6 weeks). RustAcademy's advantage is in-app purchases (none vs 1) and iOS requirement (16.4 vs 18.0). On ads and device support there is nothing between them.

Opcodes is free to download; RustAcademy costs $5.99 up front. Opcodes sells 1 one-off in-app purchase. RustAcademy asks for nothing beyond the download.

RustAcademy ships an update every 6 weeks, Opcodes every 8 days. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | RustAcademy | Opcodes |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | — | **[4.8 (6 ratings)](https://appshunter.io/ios/app/opcodes-retro-cpu-reference/id6760205834/reviews)** |
| Number of ratings | — | **6** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 8 days** |
| Monetization | Paid | **Free** |
| Size | 54 MB | 58 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SimTeCon GmbH](https://appshunter.io/developer/1761797043) | [John Kennedy](https://appshunter.io/developer/284943103) |

## What reviewers say

### RustAcademy

[App page](https://appshunter.io/ios/app/rustacademy/id6740005880)

Learn Rust programming through focused, bite-sized lessons and daily challenges. Master core concepts, algorithms, and syntax with guided practice and code reading. Ideal for developers seeking a deeper understanding of Rust.

**Highlights:** Bite-sized Rust lessons, Guided practice and code reading, Daily recall challenges, Structured algorithm track, Code completion exercises, Favorite module saving

**Features:** macOS Compatibility

**In-app purchases:** none


### Opcodes

[App page](https://appshunter.io/ios/app/opcodes-retro-cpu-reference/id6760205834)

This app provides a comprehensive reference for retro CPU opcodes, including detailed descriptions, assembly examples, and historical context. It covers eighteen iconic processors and offers features like search, sorting, and filtering for easy exploration of historical computing information.

**Highlights:** Opcode reference for 18 iconic processors, Detailed instruction descriptions, Hex, octal, decimal values, Flags affected, addressing modes, cycle counts, Assembly code examples, CPU history and pinout diagrams, Simple assembler/disassembler

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy Me a Coffee | $0.99 | one-time |


## Frequently asked questions

### Is RustAcademy free?

RustAcademy costs $5.99, with no in-app purchases.

### Is Opcodes free?

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

### Do RustAcademy or Opcodes have ads?

Neither RustAcademy nor Opcodes shows ads.

### Which is updated more often, RustAcademy or Opcodes?

RustAcademy ships an update every 6 weeks, and Opcodes every 8 days. Most recently, RustAcademy was updated on October 20, 2026 and Opcodes on October 7, 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.*