OpenCanvas · agent-driven canvas

An infinite canvas
your LLM draws on.

Ask anything. The agent renders typed widgets on a tldraw canvas — markdown, charts, kanbans, code, tables, web embeds, sandboxed plugins. Every conversation indexes back into a local SQLite KB, so the canvas gets smarter with every turn.

Get it on GitHub Watch demo

BYO model MCP-native Local-first MIT 596 tests

why it's different

Chat is a stream. Real work is a canvas.

Every output is a typed contract between the agent and the renderer. Add new widget kinds without fine-tuning. Plug in any MCP server. Drive the canvas from any process.

Typed widgets, not text

15 built-in widget kinds — markdown, code, tables, charts, kanban, calendars, web embeds, sandboxed plugins. Each is a Zod schema + a React component. Add more without retraining.

BYO model

Six provider adapters: Claude (Agent SDK or direct), OpenAI, OpenRouter, Ollama (fully local), Sourcegraph Amp. Switch via one config field. Run it 100% offline if you want.

MCP-native

Drop in any Model Context Protocol server — Confluence, Jira, filesystem, GitHub. Every LLM provider gets them via tool-use, whether it's Claude, GPT, or a local Llama.

Self-improving KB

Every conversation auto-indexes into a local SQLite + sqlite-vec store. Old turns become searchable across all your chats. Hybrid BM25 + vector retrieval. Bigger context with use.

REST-driven

Any local process — cron jobs, watchers, scripts — can render widgets via POST /v1/canvas/widgets. Authenticated. Browser tab sees them live via SSE.

Local-first + secure

Token-authenticated local backend. Strict CORS. Sandboxed plugin iframes (null origin, no parent DOM access). No telemetry, no remote services unless you point it at one.

install

Four commands. Local. MIT.

terminal

# Clone, install, configure, run.
git clone https://github.com/ashark-ai-05/opencanvas.git
cd opencanvas
pnpm install
cp .env.example .env       # set at least one provider key
pnpm electron:dev          # full stack: backend + Vite + Electron

Packaged installers (.dmg / .exe / .AppImage) ship via the Releases tab.

REST API

Drive the canvas from anywhere.

The canvas isn't just for the agent. Any local process can place widgets, stream long answers, register custom widget kinds, and inspect canvas state via a REST API. Full /openapi.yaml spec ships in the repo; Swagger UI lives at /docs when the backend's running.

Browse the API Raw spec (YAML)