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cnvs.app

cnvs.app is a free, browser-based collaborative whiteboard for people and AI agents.

Place
#25 of 56
Score
6.8
cnvs.app's website

What cnvs.app is

cnvs.app is a free, browser-based collaborative whiteboard for people and AI agents. Anyone with a board URL can join and edit live without signing up, and changes sync over WebSockets. Its canvas supports freehand drawing, Markdown text, sticky notes, diagram boxes, connectors, image and URL pasting, and pan and zoom. Users can render Mermaid diagrams from text, including flowcharts, sequence diagrams, ER diagrams, Gantt charts, and mindmaps. An empty board can switch to a kanban task board with columns, lanes, and cards for descriptions, due dates, priorities, and assignees. MCP-capable clients and REST API clients can read and edit boards without an API key. Boards can be printed or exported as PDFs; board JSON and task CSV exports are also listed. The installable Progressive Web App works on phones and tablets and provides read-only access to previously cached boards offline. Traffic is TLS-encrypted, and access keys can restrict writing or both reading and writing. Boards are purged after 30 days of inactivity, with no user-facing recycle bin or individual-board recovery.

Good

  • Anyone with a board URL can collaborate without signing up.
  • Supports Mermaid diagrams and kanban task boards.
  • MCP and REST API clients can edit boards without an API key.
  • Works on phones and tablets as an installable web app.
  • Offers PDF, board JSON, and task CSV exports.

Watch out

  • Boards are purged after 30 days of inactivity.
  • There is no individual-board recovery or user-facing recycle bin.
  • Offline access to cached boards is read-only.
  • Per-board limits include 500 text nodes and 2,000 strokes.

Who it suits

cnvs.app suits people and AI agents that need to collaborate on a browser-based whiteboard without sign-up. It may fit teams that use diagrams or kanban boards and can work within the inactivity retention limit.

Verdict

cnvs.app combines live guest collaboration with drawing, diagramming, kanban, and AI-client access. Its inactivity purge and per-board limits are important considerations for ongoing work.

Plans and prices

From cnvs.app's own pricing page, checked 9 Oct 2026.

All about pricing
PlanPriceWhat it gives you
FreeFreeUnlimited boards · unlimited collaborators · 30-day inactivity retention · forever

The facts

Each one read from cnvs.app's own pages, with the date it was checked.

What it does

AI integrations
MCP-capable clients and REST API clients can read and edit the same live boards without an API key.checked 9 Oct 2026
Canvas tools
The canvas supports freehand drawing, text with Markdown, sticky notes, diagram boxes, connectors, image and URL pasting, and pan and zoom.checked 9 Oct 2026
Diagrams
Mermaid diagrams, including flowcharts, sequence diagrams, ER diagrams, Gantt charts, and mindmaps, render from text in a canvas node.checked 9 Oct 2026
Exports
The product supports printing and PDF export, and the app page also lists board JSON and task CSV export options.checked 9 Oct 2026
Kanban mode
An empty board can be switched to a kanban task board with columns, lanes, and cards carrying descriptions, due dates, priorities, and assignees.checked 9 Oct 2026
Mobile and offline
It is an installable Progressive Web App that works on phones and tablets and provides read-only access to previously cached boards offline.checked 9 Oct 2026
Privacy
The maker says board content is excluded from AI training and analytics; its privacy policy says Google Analytics may collect page and coarse usage data on tagged pages.checked 9 Oct 2026
Retention limit
Boards are purged from the live service after 30 days of inactivity, and there is no user-facing recycle bin or individual-board recovery.checked 9 Oct 2026
Security
Traffic is TLS-encrypted, and boards can be locked with an access key for write access or both reading and writing.checked 9 Oct 2026
Sharing and sync
Anyone with a board URL can collaborate live without signing up, and edits sync over WebSockets.checked 9 Oct 2026
Support
The privacy policy directs privacy questions to [email protected] and says users can submit information through the feedback form or support email.checked 9 Oct 2026
Usage limits
Developer documentation lists per-board limits of 500 text nodes, 50 images totaling up to 10 MB, and 2,000 strokes.checked 9 Oct 2026
What it does
cnvs.app is a free, browser-based collaborative whiteboard for people and AI agents.checked 9 Oct 2026

The company

Maker
The about page identifies CODER AI as the maker of cnvs.app.checked 9 Oct 2026

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