Simulator licence and source code

The circuit simulator at electrician.wiki/simulator/ is CircuitJS1 by Paul Falstad and Iain Sharp. It is free software, licensed under the GNU General Public License, version 2 or later. We host the compiled program unmodified, and we thank its authors for their work. The help pages are served as they appear in the source repository: the web-analytics script that the upstream website's hosting adds to them is removed, so using the simulator here never reports you to a third party.

Complete corresponding source

• Upstream repository: github.com/pfalstad/circuitjs1
• Commit: 5a707168778216bb6ed01bfdd62e8bbf7ae0a032 (2026-09-23), browse
• A copy of that source, served by us: circuitjs1-5a70716.zip (2.0 MB)
• Compiled build mirrored from falstad.com/circuit/circuitjs110/ on 2026-10-14; file list in mirror-manifest.json.

If we modify the simulator in future, the modified source will be published here and in a public repository before the modified build goes live. Questions: contact us.