Mach3 is a popular CNC control software that allows you to control and operate CNC machines.
Best CNCjs Alternatives ranked by AI · updated Aug 2026
CNCjs is an open-source web-based G-code sender for CNC machines using GRBL, TinyG, Smoothieware, and related controllers. It runs on a computer or single-board system and provides browser-based control, visualization, macros, and monitoring.
Top 6 CNCjs alternatives
2
Universal Gcode Sender
Will Winder and contributors
Universal Gcode Sender is a cross-platform desktop G-code sender for CNC routers, mills, laser engravers, and other compatible machines. It supports controllers...
Pros
- Supports more controller families than most GRBL-focused senders
- Runs on Windows, macOS, and Linux
- Includes 3D toolpath visualization and machine controls
Cons
- More complex to configure than Candle or OpenBuilds CONTROL
- Java installation and serial settings can add setup friction
- Interface feels less streamlined than newer senders such as gSender
Free, open source
3
bCNC
Vlachoudis
bCNC is an open-source CNC controller, sender, and basic CAM utility for machines that use G-code. It is aimed at hobbyists and...
Pros
- Free and open-source with cross-platform support
- Adds machine control, jogging, probing, and G-code sending beyond jscut
- Useful for GRBL-based CNC machines
Cons
- CAM design features are less complete than jscut or commercial suites
- Interface is more technical and less polished
- Requires more manual machine configuration
4
gSender
Sienci Labs
gSender is a desktop G-code sender for GRBL and compatible CNC controllers, designed for routers, mills, and laser machines. It emphasizes guided...
Pros
- More polished and approachable interface than Universal Gcode Sender
- Strong probing, jogging, and work-coordinate workflows
- Includes helpful machine setup and troubleshooting tools
Cons
- Narrower controller support than Universal Gcode Sender
- Primarily targets GRBL-based machines
- Some features are most closely integrated with Sienci hardware
5
OpenBuilds CONTROL
OpenBuilds
OpenBuilds CONTROL is a desktop machine-control application for GRBL-based CNC routers, lasers, and other motion systems. It combines G-code sending with jogging,...
Pros
- Simpler setup experience than Universal Gcode Sender for many GRBL machines
- Strong calibration, probing, and machine-maintenance workflows
- Available for Windows, macOS, and Linux
Cons
- Less flexible for non-GRBL controllers than Universal Gcode Sender
- Some workflows are oriented toward OpenBuilds hardware
- Fewer advanced controller integrations than CNCjs
6
Candle
Denvi
Candle is a lightweight open-source G-code sender and visualizer for GRBL-controlled CNC machines. It provides job loading, 3D preview, jogging, overrides, and...
Pros
- Lighter and faster to launch than Universal Gcode Sender
- Clear 3D toolpath preview for basic GRBL jobs
- Simple interface is suitable for straightforward machine control
Cons
- Supports fewer controller types than Universal Gcode Sender
- Fewer probing, automation, and workflow features than bCNC
- Less polished documentation and packaging across platforms
Free, open source
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