# Opcodes vs Henge

Opcodes and Henge are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Opcodes sells 1 one-off in-app purchase and Henge sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Opcodes ships an update every 8 days, Henge every 10 days. The most recent releases landed on October 7, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Opcodes | Henge |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 10 days |
| Monetization | Free | — |
| Size | 58 MB | 11 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [John Kennedy](https://appshunter.io/developer/284943103) | [river.io llc](https://appshunter.io/developer/452867373) |

## 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 |


### Henge

[App page](https://appshunter.io/ios/app/henge/id6798126839)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The full version | $19.99 | one-time |


## Frequently asked questions

### Is Opcodes free?

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

### Is Henge free?

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

### Do Opcodes or Henge have ads?

Neither Opcodes nor Henge shows ads.

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

Opcodes ships an update every 8 days, and Henge every 10 days. Most recently, Opcodes was updated on October 7, 2026 and Henge on October 18, 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.*