A Lean Canvas with a real local AI coach. Your idea stays on your laptop.

精益画布在九个格子里做的事。

精益画布是一份单页的商业模式——问题、解决方案、独特价值主张、渠道、客户细分、不公平优势、关键指标、成本结构、收入来源。它用九个创业者真正必须回答的问题，替代一份 30 页的商业计划书，用来判断这个想法是否成立。

Totally Lean 在你的浏览器里跑这份画布。没有账户，没有服务器，数据留在你本地的存储里。三个本地 AI 助手帮你填写；一段 90 秒的语音路演生成器，把画布变成你能直接递给陌生人的东西。

点击"开始"，几秒钟内就能编辑——不注册、不留邮箱、没有团队工作区。想让别人加入，就把 URL 分享出去。想留一份副本，就导出 JSON。

其他创业者把同一份画布套用的方式。

同样的九个格子，针对不同时刻被裁切。选一份贴合你当下处境的。

• 不是电子表格 · 不是路演稿你真的还会再打开一次的那份商业计划，配套的精益画布。
• 在路演稿之前在你写路演稿之前先写的一份精益画布。
• 为晚上 11 点冒出来的那个想法准备想法冒出来那天晚上就动手写的精益画布。
• 没有账户 · 没有服务器 · 没有挤满人的会议室从来不离开你笔记本电脑的那份精益画布。
• 打字 · 听一听 · 发出去九个格子，九十秒。带语音路演的精益画布。

Frequently asked

Can Claude, Codex, or Cursor operate this canvas for me?

Yes. Totally Lean publishes an operating manual for AI agents at /agent.txt — a public document describing the canvas data model, stable DOM selectors, keyboard shortcuts, and rules agents should follow. Any browser-driving agent (Claude for Chrome, Codex Chrome extension, Operator-class tools) can read the manual and operate the canvas through documented affordances. The agent talks to your browser, not to us — your canvas never reaches a server. The .leancanvas JSON file format gives agents a structured read/write channel as well.

What do the three local AI agents do? Why three?

Three different conversations help at different stages of writing a canvas. Onboarding interviews you when the canvas is blank. Critic challenges what you've written — weak Problem statements, vague Customer Segments, hand-wavy Unfair Advantages. Explorer brainstorms adjacencies you haven't considered. Each holds a structured written conversation about the canvas; none overwrites it directly. All three run on your machine — WebGPU in your browser or your own Ollama daemon.

Is the AI really local? Where does the model actually run?

Two paths. (1) WebGPU — model weights download once and cache in your browser; inference runs on your GPU. (2) Ollama — your own daemon running locally; the browser talks to it via localhost. Neither sends canvas content to any server we operate. The default behavior is fully offline.

Can I read or write the .leancanvas file with my own tools?

Yes. The format is documented at /file-format with a JSON Schema (Draft 2020-12). Open it in a text editor, parse it with any JSON library, edit it programmatically — versioned, stable, agent-friendly. The format is the same shape the editor uses internally; no proprietary lock-in layer between what you see and what gets exported. If Totally Lean disappears, your canvases stay readable forever.