An electronic circuit simulator that runs in the browser, letting you build and simulate analog and digital circuits interactively.
2.5K+9 this week443TypeScriptGPL-2.0Well maintainedUpdated 3 days ago
1 alternative
Best open-source alternatives to Falstad Circuit Simulator (2026)
Looking for a free, open-source alternative to Falstad Circuit Simulator? These 1 projects can replace it. Each one passed our quality screening and is explained in plain words, so you can compare stars, license and maintenance at a glance.
Quick comparison
| Project | Stars | License | Last commit |
|---|---|---|---|
| pfalstad/circuitjs1 | ★ 2.5K | GPL-2.0 | 3 days ago |
FAQ
- Is there a free, open-source alternative to Falstad Circuit Simulator?
- Yes. The most popular open-source alternatives to Falstad Circuit Simulator on Repolode are circuitjs1.
- Which Falstad Circuit Simulator alternative should I choose?
- circuitjs1 has the most GitHub stars and is released under GPL-2.0. Compare the license and last commit of each option in the table above before choosing.
How this list is made: AI reads each project's documentation to match it with products it can replace, every project passes our quality screening, and the list is ranked by GitHub stars. Stars updated Nov 5, 2026. How Repolode works