Source: https://mokxi.com/vs/falstad Updated: 2026-09-27 Comparison # Mokxi and Falstad’s circuit simulator, compared fairly Paul Falstad’s circuit simulator, often called CircuitJS, is a free, open-source, browser-based tool for real-time analog and digital circuit simulation with live current and voltage animation. It is built to teach how a circuit behaves, not to run Arduino firmware. Mokxi runs real firmware on a real breadboard. The two are complementary rather than competing on the same job. or see the plans - 192 parts on the bench - 25 boards running now - 1.00x real time, on every board Click to open it in the editor Running here on our own RISC-V core, on the machine in front of you. The Mokxi editor running a 555 astable on the bench, with an oscilloscope showing the square wave and a meter reading its average. ## Where Falstad (CircuitJS) leads These are the strongest reasons to choose Falstad (CircuitJS) today. - Free, open source, and has run in a browser for a very long time, with a huge library of shared, linkable example circuits. - Excellent live animation of current flow and voltage, which makes it a genuinely strong tool for building intuition about analog and simple digital circuits. - No account, no boards to pick, and a circuit is shareable as a single link with its state encoded in the URL. - A broad, general-purpose electronics teaching tool, not narrowed to any one microcontroller family. ## Where Mokxi leads These are working parts of Mokxi you can open and test for yourself. - Runs real, compiled C++ against a cycle-accurate Arduino Uno or ESP32-C3; Falstad’s simulator has no built-in notion of compiling and executing microcontroller firmware. - A breadboard at real 0.1 inch pitch, wired the way a physical build is wired, rather than a schematic-style canvas. - Real parts, including a 74HC595 shift register, an NE555 and 74HC-series logic, alongside a microcontroller on the same board. - Aimed at people building a specific Arduino or ESP32-C3 project, rather than at general circuit theory. ## Side by side Checked on 2026-09-16. If anything here has gone stale, that is our mistake and we want to know. Mokxi Falstad (CircuitJS) Aimed at Firmware and breadboard work General circuit theory and analog intuition Runs firmware Yes, real compiled C++ No Layout A real breadboard A schematic canvas Sharing A link that carries the whole circuit, no account needed, or a saved project’s link State encoded directly in the URL Price Free Free ## Which one should you use Straight answers. Where the other one is the right call, we say so. ### You want to build intuition about a generic RLC or diode circuit Falstad’s simulator is built exactly for that. ### You want to run an actual Arduino or ESP32-C3 sketch Mokxi. Falstad’s simulator does not run microcontroller firmware. ### You want to wire a project on something that looks like a real breadboard Mokxi. ### You want to share a tiny circuit as a single link with no account Either. Both put the whole circuit in the link, so neither needs an account. ## Compare the other options The same straight comparison for the tools teachers, students and makers also consider. Mokxi vs Tinkercad Circuits Mokxi vs Wokwi Mokxi vs Proteus Mokxi vs Fritzing Mokxi vs SimulIDE Mokxi vs Multisim Mokxi vs LTspice Compare every simulator ## In short Should I use Mokxi if you want to build intuition about a generic rlc or diode circuit? Falstad’s simulator is built exactly for that. Should I use Mokxi if you want to run an actual arduino or esp32-c3 sketch? Mokxi. Falstad’s simulator does not run microcontroller firmware. Should I use Mokxi if you want to wire a project on something that looks like a real breadboard? Mokxi. Should I use Mokxi if you want to share a tiny circuit as a single link with no account? Either. Both put the whole circuit in the link, so neither needs an account. ## Try it yourself A comparison page is somebody else’s opinion. Open the editor, press Run and make up your own mind. Start building Open the editor