LDraw
Draw and edit diagrams with Excalidraw, keep editable .excalidraw files, and export PNG or SVG. Drawings stay in this browser; download copies for backup.
Contract reviewed 25 October 2026. The same name appears in the app’s own repository and interface.
Desktop supported · Phone limited
Device requirements and checks
Creator’s intended target: Desktop and mobile. This is a build requirement; tested support is listed separately.
- Desktop · Main task: supported. Verified in Chromium with a keyboard and pointer. Physical devices and screen readers remain unchecked. Requires keyboard, pointer, file-download, file-picker. Checked 2026-10-24 using browser emulation: Chromium: native drawing/text, file roundtrip, PNG/SVG preview/export, autosave and offline current-scene reload. Composer issue #290. · source
c9c2339a1296. - Phone · Main task: limited. 390px Chromium drawing, text, native file and SVG journeys passed with a pointer and keyboard. Physical touch and mobile file handling remain unchecked. Requires keyboard, pointer, file-download, file-picker. Checked 2026-10-24 using browser emulation: Chromium: native drawing/text, file roundtrip, PNG/SVG preview/export, autosave and offline current-scene reload. Composer issue #290. · source
c9c2339a1296. - Tablet · Main task: not checked yet. Tablet editing, stylus and file handling have not been checked.
You can open the app to inspect it. Copying its address does not transfer browser-local files or unsaved work.
What this app does.
Sketch a system, a game scene or a music workflow. Use editable examples as starting points.
- Draw with Excalidraw’s shapes, text, arrows, images, selection and undo.
- Keep an editable .excalidraw file; import a checked native scene or export PNG and SVG.
- Autosave in this browser, with a previous snapshot and a revision check against another tab.
Make it yours. Open the independent editor and choose drawing colours and export settings. Keep an editable download before clearing browser data.
Works with. Uses its own origin and browser storage. An authorised agent can work with native .excalidraw files or the same-tab window.ldraw interface. Composer does not receive the drawing; there is no MCP service.
Build with this app
Use LDraw’s native .excalidraw files and independent editor source. Give your agent the released source and an editable scene; browser access stays under your authorisation.