Hi Product Hunt! I built MechSim because I was tired of firing up heavy CAD software just to test a simple linkage idea. As an engineer, I needed something fast, free, and browser-based—no bloat, no licenses, just mechanics. So I built it. What it does: Sketch & Simulate planar mechanisms in seconds with an intuitive interface Analyze motion in real-time (velocity, acceleration, constraints) Run anywhere—no installation, 100% free, works entirely in your browser Under the hood, it uses a Newton-Raphson constraint solver for professional-grade accuracy. Works whether you're a student learning kinematics or an engineer prototyping a linkage. I'd love your feedback: How's the solver performance on your mechanisms? What features would you want next? (DXF export, more joint types, etc.) Give it a try and let me know what you think!

MechSim — Kinematics simulator

Simulate planar mechanisms in seconds. No install required

Simulate planar mechanisms in seconds. No install required