Read, check and understand any G-code program.

Program outline

The program is split into its header and footer, operations at each tool change or comment marker, canned cycles with their holes, and subprograms with their calls. Click an item to jump to its code.

Colour-coded code

Every word is coloured by what it is: G and M codes, tool and offset numbers, feeds, speeds and comments. Codes the controller doesn't know are kept and marked, never dropped.

Flagged lines and checks

Lines worth a second look get a ⚠ flag, with the reason:

• cutting with no tool loaded, no feed rate, or the spindle off
• an arc whose end isn't on its circle
• two codes from one modal group, an unclosed comment, unknown codes

Modal state at the cursor

The status bar shows what is active on the current line: motion mode, plane, units, absolute or incremental, work offset, tool and offsets, spindle, coolant and feed.

3D path, step, play and Simulate

See the toolpath in 3D with step and play through the moves, top and ISO views of the part or the machine, saved views, and Simulate when you want to watch it cut.

Hover help for every code

Point at a G or M code, or an address letter, for a plain-English explanation. Help is written from public documentation, with controller-specific notes for Haas and Grbl.

Edit, save and autosave

Edit the code and it is read again as you pause. Ctrl/⌘+S saves back to the same file, keeping its line endings. Unsaved edits are kept in the browser and offered back next visit.

Your machines and tools

Keep a shop list of machines with their controller, units, travel, spindle and the tools in each pocket. Start from the Machine Library or a blank machine, and export or import it as a shop file.