Comparison

FPCClarksville vs Opcodes

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

FPCClarksville

Features
Read full description

This app will help you stay connected with the day-to-day life of our church, preschool, and Learning Center. With this app you can: watch or listen to past messages; stay up to date with push notifications about special events; share your favorite messages via Twitter, Facebook, or email; and download messages for offline listening. Join in prayer and Bible Study with members of our congregation. Mobile app version: 6.23.8

About

Opcodes

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
Read full description

Opcodes – The Retro CPU Reference The definitive opcode reference for the legendary processors that launched the personal computer revolution. Whether you're a retrocomputing enthusiast, a student of computer history, writing code for classic hardware, or just a big old nerd - the Opcodes app gives you everything you need. Eighteen iconic processors covered: Intel 4004 · Intel 8008 · Intel 8080 · Intel 8085 · Intel 8088 · Zilog Z80 · Motorola 6800 · Intel 8085 · Motorola 6809 · MOS 6502 · Signetics 2650 · RCA 1802 - SC/MP · Motorola 68000 · Intel 8086 · WDC 65816 · Texas Instruments TMS9900 · INMOS Transputer · ARM2 For every opcode:  • Full description of what the instruction does. • Hex, octal, and decimal values. • Flags affected. • Addressing modes and cycle counts. • Assembly code examples - including loops, conditionals, and common patterns. More than just opcodes:  • CPU history and historical context. • IC pinout diagrams. • Notable systems that used each CPU, with memory maps and other background information. • Chip variants and successors. • A silly card game(!) • Simple assembler / disassembler for many CPUs. Built for exploration:  • Search for opcodes by name or category. • Sort by mnemonic, opcode byte, or category. • Filter by category, Quick Find with a colorful map. • Undocumented instructions clearly marked and optionally displayed. More than microprocessors:  • Information on key support chips: video, sound, memory and more. Cool design:  • Clean, readable layout optimised for quick reference. • Multiple colour themes. • Full "dark mode" support. Everything is included with absolutely no in-app purchase required. Recent additions: • Quiz game - test your CPU knowledge! • Share CPU cards - beautiful shareable images showing specs and history for any processor • External references - curated links to community resources for all 18 CPUs • "Opcodes display first" setting - choose whether selecting a CPU shows opcodes or info first • Chip-maker colour themes - Zilog, MOS Tech, and Motorola replace the old themes • Enhanced 6502 docs - JMP page boundary bug, BRK behaviour, and Read-Modify-Write quirks • Fixed Scratchpad hang when switching tabs

Screenshots

FPCClarksville3 screens
Opcodes4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard4 real differences · 5 level
FPCClarksville versus Opcodes: the parameters behind the verdict, then further details
ParameterFPCClarksvilleOpcodes
PriceFreeFree
Rating—4.8 (6 ratings) — better
Number of ratings—6 — better
Update frequencyEvery 5 monthsEvery 8 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free
DevicesiPhone, iPad, iPod, Apple TV — betteriPhone, iPad
Requires iOS15.1 — better18.0
Further details — not scored
Size56 MB58 MB
Age rating4+4+
DeveloperFirst Presbyterian Church of Clarksville, Inc.John Kennedy

In-app purchases

None

FPCClarksville

No in-app purchases

1 purchases

Opcodes

One-time1
  • Buy Me a Coffee$0.99

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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