Rapier

Rapier gives you and ChatGPT an editable page to work on together. Write and organise Markdown, edit code blocks, add pictures, draw, paint and build diagrams in the same document.

Ask ChatGPT to turn an idea into a plan, explain something visually, rewrite a section, sketch a layout or map out a system. You can edit the page yourself, rearrange drawing objects and review proposed changes before accepting them. ChatGPT can make focused edits and undo its own recorded changes while preserving your later work.

Keep your work as portable Markdown. In a host with file and code execution, the included skills can also make a single editable HTML file that opens offline, or help embed Rapier in your own app. The hosted editor does not need a Rapier account.

Only the document you share with the hosted workspace is sent to Rapier's service. Hosted workspaces expire after 30 idle days; save a copy to keep it. Rapier cannot access unshared files or notes on your device. Painting and JPEG XL pictures depend on the host browser's image support.