# Opcodes vs Turing Lab

The clearest difference is in-app purchases: Turing Lab at none against Opcodes's 1. Turing Lab also leads on device support (4 vs 2) and iOS requirement (15.0 vs 18.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Opcodes sells 1 one-off in-app purchase. Turing Lab asks for nothing beyond the download.

Opcodes ships an update every 8 days, Turing Lab weekly. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Opcodes | Turing Lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/opcodes-retro-cpu-reference/id6760205834/reviews)** | — |
| Number of ratings | **6** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 days | **Weekly** |
| Monetization | Free | — |
| Size | 58 MB | 36 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [John Kennedy](https://appshunter.io/developer/284943103) | [Thales Santos](https://appshunter.io/developer/6782515895) |

## What reviewers say

### 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 |


### Turing Lab

[App page](https://appshunter.io/ios/app/turing-lab/id6801653541)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Opcodes free?

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

### Is Turing Lab free?

Turing Lab is free to download, with no in-app purchases.

### Do Opcodes or Turing Lab have ads?

Neither Opcodes nor Turing Lab shows ads.

### Which is updated more often, Opcodes or Turing Lab?

Opcodes ships an update every 8 days, and Turing Lab weekly. Most recently, Opcodes was updated on October 7, 2026 and Turing Lab 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.*