Planar linkage simulator in your browser
Drop pins, connect links, add sliders — and watch your mechanism come alive. Powered by a Newton-Raphson constraint solver. No install, no account, no limits.
Everything you need to design linkages
Pin & Link Editor
Place grounded pivots, free joints, and connect them with rigid links. Drag to reposition, click to edit properties.
Rail, Arc & Circle Sliders
Linear rails, arc paths, and full circle sliders — passive or motor-driven. Mix slider types in a single mechanism.
Newton-Raphson Solver
Levenberg-Marquardt constraint solver resolves complex chains in real time. Configurable tolerance and iterations.
Data Recorder
Record position, velocity, and acceleration for any tracked joint. Export to CSV for analysis in Excel or MATLAB.
Trace Paths
Visualize coupler curves in real time. Enable trace on any pin to see the path it draws during simulation.
Save & Load
Download your mechanism as a portable .mechsim.json file. Reload anytime — no account needed.
Three steps to your first mechanism
Place ground pivots
Press G and click on the canvas to place two grounded pins. Set angular speed on one to make it the crank.
Add joints & links
Press J to add free pins, then L to connect them with rigid links. The solver auto-detects the chain.
Hit Play
Press Space and watch it move. Enable trace paths, record data, or adjust speed — all in real time.
Start building mechanisms now
Free, browser-based, no installation. Works in Chrome, Edge, Firefox and Safari.
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