Best apps like Opcodes - retro CPU reference

9+ similar apps compared and reviewed

4.9 avg rating

9 free apps

Updated September 2026

John Kennedy

Opcodes is great, but it's not the only option. Explore 9+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.

Top Alternatives to Opcodes

Kim6502 by Michael Herman

A retro 6502 CPU simulator

Editor's Choice

📚 Education

0.0(0 ratings)

FreeIn-App Purchases

Kenbak-1 by Takhir Zakirov

Strong Contender

📚 Education

0.0(0 ratings)

Free

iAltair by Peter Schorn

Vintage computing made easy

Worth Considering

📚 Education

4.8(21 ratings)

Free

Experience vintage computing with a simulation of the MITS Altair 8800. Explore old software like CP/M 2 and run programs such as Eliza using built-in BASIC. This self-contained system offers a unique glimpse into early computing history.

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Blumoto

A Heathkit ET-3400 Simulator

From transistor to computer

Learn FORTH on your iPhone

Lions' Unix v6 Source Study

Free

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.

Interactive virtual machine for OS studySource-level debuggingPrecise execution control (step in, over, out)

Logic Gates, Flip-Flop & more