# FPCClarksville vs Opcodes

The clearest difference is in-app purchases: FPCClarksville at none against Opcodes's 1. FPCClarksville also leads on device support (4 vs 2) and iOS requirement (15.1 vs 18.0). Opcodes's advantage is update cadence (every 8 days vs every 5 months). On price and ads there is nothing between them.

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

FPCClarksville ships an update every 5 months, Opcodes every 8 days. The most recent releases landed on September 30, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | FPCClarksville | Opcodes |
| --- | --- | --- |
| 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 | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 8 days** |
| Monetization | — | Free |
| Size | 56 MB | 58 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [First Presbyterian Church of Clarksville, Inc.](https://appshunter.io/developer/1661738096) | [John Kennedy](https://appshunter.io/developer/284943103) |

## What reviewers say

### FPCClarksville

[App page](https://appshunter.io/ios/app/fpcclarksville/id1661738094)

**Features:** 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 FPCClarksville free?

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

### Is Opcodes free?

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

### Do FPCClarksville or Opcodes have ads?

Neither FPCClarksville nor Opcodes shows ads.

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

FPCClarksville ships an update every 5 months, and Opcodes every 8 days. Most recently, FPCClarksville was updated on September 30, 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.*