Best Dec Opcodes Apps

250+ iOS apps curated and reviewed

4.8 avg rating
20 free apps
Updated August 2026

With an average user rating of 4.8★, the dec opcodes category is one of the App Store's strongest. Browse all 250+ apps we track, sorted so the most loved ones surface first.

Compare top Dec Opcodes Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1DEC OpcodesDEC OpcodesFree5.0★ (3)NoYesJul 2026
2Opcodes - retro CPU referenceOpcodes - retro CPU referenceFree4.8★ (6)NoYesSep 2026
3Numerical³Numerical³Free4.8★ (1.3K)NoNoSep 2026
4Adelis QR ScannerAdelis QR ScannerFree5.0★ (1)YesNoJul 2026
5Developer Calc Hex Dec Oct BinDeveloper Calc Hex Dec Oct BinFree4.1★ (15)YesNoSep 2026
6CMD: SSH, Terminal, DOS, PingCMD: SSH, Terminal, DOS, PingFree5.0★ (76)YesNoSep 2026
7Kenbak-1Kenbak-1FreeNoNoMay 2026
8SDK85SDK85Free4.0★ (1)NoNoAug 2026

Top Picks for Dec Opcodes

DEC Opcodes#1

DEC Opcodes by John Kennedy

Reference for DEC computers
Editor's Choice
📚 Education
5.0(3 ratings)
FreeIn-App Purchases
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Explore the instruction sets of legendary DEC computers like the PDP and VAX. This app provides detailed information on each instruction, historical context, and interactive lessons. Discover the machines that shaped modern computing.

Opcodes - retro CPU reference#2

Opcodes - retro CPU reference by John Kennedy

Decades of nerd knowledge
Strong Contender
📚 Education
4.8(6 ratings)
FreeIn-App Purchases
Opcodes - retro CPU reference screenshot 1
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Opcodes - retro CPU reference screenshot 6

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.

Numerical³#3

Numerical³ by Andrew J Clark

The Calculator Without Equal
Worth Considering
🔧 Utilities
4.8😊(1.3K ratings)
Free
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Numerical³ screenshot 6

A powerful and beautifully designed calculator app that offers advanced scientific functions, automatic bracket handling, and a unique no-equals button interface. It integrates seamlessly with iOS features like widgets and keyboards for calculations anywhere.

What We Love

  • 🚀 Great app
  • 👍 Simple and intuitive
  • 👍 Clean and beautiful design
  • 🚀 Fast and responsive
  • 👍 Customizable themes
  • 👍 Useful features (history, editing, no equals)
  • 👍 No ads

Room to Improve

  • 🐛 Bugs and glitches (unresponsive keys, calculation errors)
  • 🔍 Lack of advanced functions (scientific, unit conversion)
  • 💡 Needs more theme options
  • 💡 Needs iPad support
  • 💡 Needs widget support

More Dec Opcodes apps to explore

FAQ about Dec Opcodes

What are the best dec opcodes apps for iPhone?
DEC Opcodes tops our dec opcodes apps ranking as of August 2026, with a 5.0-star average from 3 App Store ratings, and it's free to download.
Yes — 20 of the top dec opcodes apps we rank are free to download, including DEC Opcodes and Opcodes - retro CPU reference.
DEC Opcodes has no ads and offers in-app purchases, according to its App Store listing as of August 2026.
We track 250+ dec opcodes apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
DEC Opcodes covers five iconic DEC architectures: PDP-1 (1960), PDP-8 (1965), PDP-10 (1966), PDP-11 (1970), and VAX (1977). It provides detailed instruction sets, system specifications, and historical context for each.
For every instruction, DEC Opcodes offers a full description, octal and hex encoding, flags affected, addressing modes, word count, cycle counts, and assembly code examples. It also includes implementation notes and historical context.