Draw and simulate digital logic circuits on your phone, tablet or desktop.
Build circuits with logic gates, latches, flip-flops, clocks, switches, RAM/ROM, 7-segment displays and ready-made parts like adders and an ALU. Press Run and watch the signals flow, or step one clock edge at a time.
NEW: Subcircuits. Save any circuit and reuse it as a chip inside bigger circuits.
- Example circuits to learn from, including counters
- Undo/redo, multi-select, text notes
- Automatic saving, import and share circuit files
- Dark and light themes, 9 languages
The free version can save up to 2 subcircuits per project. A one-time purchase unlocks unlimited subcircuits.
Found a bug or want a new component? Report it from the About page.
- Subcircuits: save any circuit and reuse it as a chip inside other circuits
- Memory: RAM and ROM with a built-in memory viewer
- New Step button: advance one clock edge at a time
- Open .els circuit files straight from Files or other apps
- Faster, more accurate simulation, plus many bug fixes
