DiagramThe best AI diagram tools in 2026
The best AI diagram tool is the one that puts the diagram where it needs to live. Eraser suits architecture docs, Napkin slides and posts, Whimsical and Miro team workspaces, draw.io and Excalidraw files you edit by hand, and Claude quick diagrams for people who use Claude. Diagram, which we make, lets the AI you already use save each diagram at a link that stays current. Prices are from each tool’s pricing page on October 17, 2026.
Pick by what you need
- Eraser (DiagramGPT): you want architecture docs as diagram code, with an AI that edits the code.
- Napkin AI: you want a polished visual for a slide or post from text you already wrote.
- Whimsical: you want flowcharts and wireframes in a clean shared workspace.
- Mermaid Chart: you want Mermaid you can keep in your docs, with AI to write it.
- Lucidchart (Lucid AI): your company already uses Lucid.
- Miro AI: the diagram belongs on the team’s whiteboard next to everything else.
- draw.io: you want to drag every box yourself and you’re fine sharing a file.
- Excalidraw: you want a hand-drawn sketch you keep tweaking yourself.
- Claude (artifacts): everyone you’re sharing with uses Claude.
- Diagram: the AI you already use draws it, and you want a link that stays current.
Eraser (DiagramGPT)
Generates flowcharts, ER diagrams, cloud architecture and sequence diagrams from a prompt or pasted code, and edits them with AI. Has an MCP server.
- For
- Software and architecture teams.
- Free plan
- 3 files and 3 AI diagrams.
- Paid
- Starter $15 per member a month billed yearly, $20 monthly.
- Editable
- Yes: by prompt, as diagram code, or by hand.
- Sharing
- Public view or edit links on every plan; private files from Starter.
- Pick it if
- You want architecture docs as diagram code, with an AI that edits the code.
Napkin AI
Turns text you select into visuals: infographics, flowcharts, mind maps and charts.
- For
- People making slides, posts and docs.
- Free plan
- 500 AI credits a week, PNG and PDF export, with Napkin branding.
- Paid
- Plus from $9 a person a month.
- Editable
- Yes, in Napkin.
- Sharing
- Invite people, or a link anyone can view without signing in.
- Pick it if
- You want a polished visual for a slide or post from text you already wrote.
Whimsical
An agent that makes flowcharts, wireframes and mind maps in the app, and an MCP server for outside AI tools.
- For
- Product and design teams.
- Free plan
- 50 board objects a month, watermarked exports.
- Paid
- Pro $10 per editor a month billed yearly; viewers are free.
- Editable
- Yes, as Whimsical boards.
- Sharing
- Share links and free guests on every plan.
- Pick it if
- You want flowcharts and wireframes in a clean shared workspace.
Mermaid Chart
Turns a prompt, a doc or a transcript into a Mermaid diagram, with AI in the code panel and an MCP server.
- For
- Developers and technical writers who use Mermaid.
- Free plan
- A few diagrams and limited AI.
- Paid
- Plus $10 a user a month billed yearly.
- Editable
- Yes, as Mermaid code or on a visual canvas.
- Sharing
- A link that opens without logging in.
- Pick it if
- You want Mermaid you can keep in your docs, with AI to write it.
Lucidchart (Lucid AI)
Generates flowcharts, ER diagrams, mind maps and org charts from text or an image, and edits a selected diagram. In beta and free on all plans for now.
- For
- Business and enterprise teams.
- Free plan
- 3 editable documents, 75 shapes each.
- Paid
- See Lucid’s pricing page.
- Editable
- Yes, as Lucid shapes.
- Sharing
- Lucid’s document sharing.
- Pick it if
- Your company already uses Lucid.
Miro AI
Generates diagrams, tables and summaries on a whiteboard, clusters sticky notes, and connects to Claude, Cursor and Copilot through MCP.
- For
- Teams running workshops and planning on whiteboards.
- Free plan
- 3 editable boards and a taste of AI.
- Paid
- Starter $8 per member a month billed yearly.
- Editable
- Yes, as board items.
- Sharing
- Board sharing; public editing without sign-in from Starter.
- Pick it if
- The diagram belongs on the team’s whiteboard next to everything else.
draw.io
A Generate button that drafts UI mock-ups, cloud diagrams and Mermaid with OpenAI, Claude or Gemini, or your own keys. Also an official MCP server.
- For
- Anyone who wants a free, fully editable diagram.
- Free plan
- The editor is free.
- Paid
- None for the web editor.
- Editable
- Yes, completely.
- Sharing
- draw.io stores nothing: you save the file to Drive, OneDrive, GitHub or your device and share it from there.
- Pick it if
- You want to drag every box yourself and you’re fine sharing a file.
Excalidraw
Text to diagram, Mermaid to Excalidraw, and wireframe to code. Also an official MCP server that sketches inside the chat.
- For
- People who like the hand-drawn look.
- Free plan
- 10 AI requests a day in the free editor.
- Paid
- Excalidraw+ $6 a user a month.
- Editable
- Yes, by hand.
- Sharing
- Collaboration and shareable links; read-only links with Excalidraw+.
- Pick it if
- You want a hand-drawn sketch you keep tweaking yourself.
Claude (artifacts)
Draws diagrams and flowcharts as artifacts next to the chat, and in Claude Code.
- For
- People who already use Claude.
- Free plan
- Included with Claude, Free plan and up.
- Paid
- Part of a Claude plan.
- Editable
- By asking Claude.
- Sharing
- Private by default; share by link or invite on paid plans. Anthropic says viewers need a Claude account.
- Pick it if
- Everyone you’re sharing with uses Claude.
Diagram (ours)
Not a diagram generator of its own: you ask ChatGPT, Claude, Cursor, Claude Code, Codex or Copilot for the diagram, and it saves it at a link through Diagram’s MCP server. Changes go to the same link, with every version kept.
- For
- People who already use an AI chat or coding tool, especially developers.
- Free plan
- Your first 5 diagrams.
- Editable
- By asking the AI. There is no drag-and-drop editor.
- Sharing
- Private until you share it with a project, a team, or anyone with the link (no account needed to view a public one).
- Pick it if
- The diagram should come from the tool that knows your work, and stay current at one link.
Questions
- What is the best AI diagram tool?
- It depends on where the diagram has to live. For architecture docs as code, Eraser. For slides and posts, Napkin. For a team whiteboard, Miro. For a free editable file, draw.io. To have the AI you already use draw it and keep it current at a link, Diagram.
- Is there a free AI diagram generator?
- Most have a free plan: draw.io is free, Excalidraw gives 10 AI requests a day, Napkin 500 credits a week, Eraser 3 AI diagrams, and Diagram your first 5 diagrams. If you already use ChatGPT, Claude or Cursor, they draw diagrams too.
- Can ChatGPT make diagrams?
- Yes, from a description, as code or an image in the chat. OpenAI is retiring canvas: it isn’t in GPT-5.5. To get a diagram you can edit or share, connect a diagram tool to ChatGPT: draw.io, Excalidraw, Lucid, Eraser, Whimsical and Diagram all work there.
- Which AI diagram tools work with Claude, Cursor or Codex?
- Excalidraw, draw.io, Mermaid Chart, Miro, Lucid, Eraser, Whimsical and Diagram all have MCP servers you connect to those tools.
Something out of date? Prices and plans change often; tell us at [email protected].