Dim0

Dim0 is an open-source, MIT-licensed collaborative canvas that combines rich notes, AI-generated React mini-apps and a board-aware agent on one infinite board. It supports eight model families, real-time multiplayer and self-hosting.

Dim0 is an open-source, real-time collaborative canvas that puts notes, documents, code, hand-drawn shapes and AI agents on a single infinite board. It is aimed at people whose thinking is split across a notes app, a whiteboard and a chat window, and who are tired of pasting material between them. The core idea is spatial: instead of a chat sidebar that buries context, AI output lands on the board as editable nodes beside everything else. In practice, a user addresses the board agent with a request, and the agent reads the surrounding content before it acts. It can search the web, run code and write back results such as reports, mind maps, charts or summaries. Mini-apps are the most distinctive piece: describing a calculator, quiz or visualizer produces a working React app that lives on the canvas as a node, can read the notes next to it, and can be used live by teammates or opened for code edits. Other features include nested boards that behave like folders, frames that turn into presentation slides, Markdown-based rich notes with math and toggles, a Mapify gesture that converts notes into diagrams, and eight light and dark themes. Models from Anthropic, OpenAI, Google, Mistral, DeepSeek, Alibaba, Moonshot and Z.ai can be swapped without changing the workflow. Collaboration covers live cursors, presence and shared agents, with sync handled through operational transforms and last-write-wins conflict handling. The hosted cloud has Free, Basic and Plus tiers that differ in AI request limits, board counts and model quality, while the MIT-licensed code can be self-hosted with local Postgres and personal model keys. Dim0 runs in the browser only, with tablets working well and phones better suited to reading. Among alternatives, it competes with Miro and Excalidraw on the whiteboard side, Notion and Obsidian on notes, and ChatGPT Canvas or Claude artifacts on generated apps. The site publishes comparison pages for several of them. Its appeal is the combination in one open codebase, with the trade-off that each individual area is less mature than a dedicated specialist tool.