# Another Turing Machine vs Opcodes

The clearest difference is price: Opcodes at Free against Another Turing Machine's $1.99. Another Turing Machine's advantage is in-app purchases (none vs 1) and update cadence (daily vs every 8 days). On ads, device support and iOS requirement there is nothing between them.

Opcodes is free to download; Another Turing Machine costs $1.99 up front. Opcodes sells 1 one-off in-app purchase. Another Turing Machine asks for nothing beyond the download.

Another Turing Machine ships an update daily, Opcodes every 8 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Another Turing Machine | Opcodes |
| --- | --- | --- |
| Price | $1.99 | **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 | **Daily** | Every 8 days |
| Monetization | — | Free |
| Size | 1 MB | 58 MB |
| Requires iOS | 18.2 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Stefan JOSTEN](https://appshunter.io/developer/949662361) | [John Kennedy](https://appshunter.io/developer/284943103) |

## What reviewers say

### Another Turing Machine

[App page](https://appshunter.io/ios/app/another-turing-machine/id6742148242)

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

**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 Another Turing Machine free?

Another Turing Machine costs $1.99, with no in-app purchases.

### Is Opcodes free?

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

### Do Another Turing Machine or Opcodes have ads?

Neither Another Turing Machine nor Opcodes shows ads.

### Which is updated more often, Another Turing Machine or Opcodes?

Another Turing Machine ships an update daily, and Opcodes every 8 days. Most recently, Another Turing Machine was updated on October 28, 2026 and Opcodes on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*