JustOpen Canvas

Browser-based AI workspace. No setup.

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Project:
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Agent chat

deepseek-v4-flash

No API key
Ask the agent for a code change. The agent can read and directly edit the files in this browser workspace. Create a Markdown outline, write a Python script, or build a small HTML page.
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Canvas

Browser workspace

Blank canvas
Ln 1, Col 1 0 bytes Plain text Autosaves locally
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Preview

Sandboxed iframe

Preview activates when the workspace contains index.html. It is optional for notes and non-web code.

JustOpen Canvas settings

Profiles, project files, chat history, layout, and appearance stay in this browser. API keys are never included in workspace exports.

Model profile

Create separate profiles for cloud keys, local servers, or different models.

Connection tests use a lightweight authenticated provider request and do not send a chat prompt. Automatic usage details are shown only when the selected provider exposes a browser-accessible check.

Advanced agent runtime
Advanced request JSON

Key safety

Cloud requests must use HTTPS. Plain HTTP is allowed only for localhost endpoints. Requests reject redirects so a bearer key cannot be silently forwarded to another destination.

Direct browser calls depend on the selected endpoint permitting cross-origin requests. Browser storage is convenient, not a secure vault: do not remember a key on a shared device.

About JustOpen Canvas

Browser-based AI workspace. No setup.

Your workspace stays in your browser

JustOpen Canvas is a static browser app. It has no app server, account system, analytics script, or shared key vault. Project files, chat history, appearance settings, and model profiles are stored locally in this browser.

What leaves the browser

Nothing is sent anywhere merely by opening the canvas or editing files. When you deliberately send an agent request, your browser sends the prompt, relevant workspace context, tool results, and that profile’s API key directly to the endpoint you selected. If you turn on optional Web search, search queries go directly to the configured search endpoint and returned snippets are provided to the selected model as reference material. A localhost model can keep inference on your own machine.

Keys

Model and search API keys are session-only unless you enable remembered storage. Workspace exports never include API keys. Browser storage is convenient, not a hardware vault, so avoid remembered keys on shared devices.

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