CNCjs vs Mainsail
A side-by-side comparison of CNCjs and Mainsail — pricing, license, deployment, and where each tool wins.
CNCjs
cnc.js.org
Web interface for CNC milling controllers running Grbl, Smoothieware, or TinyG.
Mainsail
docs.mainsail.xyz
Modern and responsive user interface for the Klipper 3D printer firmware. Control and monitor your printer from everywhere, from any device.
| Feature | CNCjs | Mainsail |
|---|---|---|
| Pricing | Free | Free |
| Model | Open-source | Open-source |
| License | CC-BY-SA-3.0 | CC-BY-SA-3.0 |
| Deployment | Self-hosted | Self-hosted |
| Category | Manufacturing | Manufacturing |
| Self-hosted | ✓Yes | ✓Yes |
| Free tier | ✓Yes | ✓Yes |
Pick CNCjs if…
- ✓You prefer CNCjs's feature set or ecosystem fit.
Pick Mainsail if…
- ✓You prefer Mainsail's feature set or ecosystem fit.
4–20hmedium risk
Plan a sprint — 4-20 engineering hours, run in parallel for a week.
Export from CNCjs: CSV, JSON
2 things to watch
- ⚠Manual data review recommended
- ⚠Fewer tutorials online for Mainsail — expect more trial-and-error