# RealXV6 vs Opcodes

The clearest difference is in-app purchases: RealXV6 at none against Opcodes's 1. RealXV6 also leads on rating (5.0 vs 4.8). Opcodes's advantage is update cadence (every 8 days vs every 4 months) and ratings volume (6 vs 1). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Opcodes sells 1 one-off in-app purchase. RealXV6 asks for nothing beyond the download.

RealXV6 holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Opcodes has 6 ratings behind it against 1, so its average is the more settled of the two.

RealXV6 ships an update every 4 months, Opcodes every 8 days. The most recent releases landed on June 29, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | RealXV6 | Opcodes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/realxv6/id6757357040/reviews)** | [4.8 (6 ratings)](https://appshunter.io/ios/app/opcodes-retro-cpu-reference/id6760205834/reviews) |
| Number of ratings | 1 | **6** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | Free | Free |
| Size | 15 MB | 58 MB |
| Requires iOS | **17.2** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Zheng Fang](https://appshunter.io/developer/1258046278) | [John Kennedy](https://appshunter.io/developer/284943103) |

## What reviewers say

### RealXV6

[App page](https://appshunter.io/ios/app/realxv6/id6757357040)

Explore the legendary Lions' Commentary on UNIX 6th Edition by bringing its source code to life. This app provides an interactive virtual machine to dynamically experience OS kernel operations, offering source-level debugging and precise execution control for a deeper understanding.

**Highlights:** Interactive virtual machine for OS study, Source-level debugging, Precise execution control (step in, over, out), Trace context switching and interrupts, Simplified 8086 architecture, Portable OS laboratory

**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 RealXV6 free?

RealXV6 is free to download, with no in-app purchases.

### Is Opcodes free?

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

### Which has better reviews, RealXV6 or Opcodes?

RealXV6 is rated higher. RealXV6 averages 5.0 out of 5 from 1 ratings, while Opcodes averages 4.8 from 6 ratings.

### Do RealXV6 or Opcodes have ads?

Neither RealXV6 nor Opcodes shows ads.

### Which is updated more often, RealXV6 or Opcodes?

RealXV6 ships an update every 4 months, and Opcodes every 8 days. Most recently, RealXV6 was updated on June 29, 2026 and Opcodes on September 20, 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.*