Compare 10 free diagramming tools, free tiers, and developer deals. Verified pricing for drawDB, Miro, tldraw.com, cacoo.com, Cloudcraft and more.
What this name holds: Whiteboards, flowcharts and architecture diagrams.
4 other names here answer “what do I build the interface with”, and each holds a different list: Design (95), Design & Creative (6), Forms (29), Low-Code Platforms (15).
We track 10 diagramming services with a free tier we hold as current. This category has been stable — no pricing changes recorded across any vendor.
| Vendor | Tier | Description | Verified |
|---|---|---|---|
| drawDB | Free | Free and open-source online database diagram editor with no signup required. | 2026-08-02 |
| Miro | Free | Collaborative whiteboard — 3 editable boards, unlimited team members, 10 AI credits/month, 5 Talktracks, 160+ app integrations including Zoom, Slack, and Google Drive | 2026-08-12 |
| tldraw.com | Free | Free open-source white-boarding and diagramming tool with intelligent arrows, snapping, sticky notes, and SVG export features. Multiplayer mode for collaborative editing. Free official VS Code extension available as well. | 2026-08-05 |
| cacoo.com | Free | Online real-time diagrams (flowchart, UML, network). Free plan: unlimited users, 6 sheets max, real-time editing, PNG export, templates & shapes, comment & chat, code-to-graph, kanban tool, media library. In-app video chat limited to 3 users; 50 activity entries per diagram; no revision history or premium templates. | 2026-09-05 |
| Cloudcraft | Free | AWS/Azure architecture diagramming — Free plan: single user only, manual diagrams limited to a 12x15 component grid, unlimited private diagrams, PNG/PDF/SVG export, private shared links, basic cost calculations. No live-scan/auto-discovery, team management, infinite canvas, version history, API access, or SSO. | 2026-08-26 |
| diagrams.net | Free | Online diagrams stored locally in Google Drive, OneDrive, or Dropbox. Free for all features and storage levels | 2026-08-10 |
| gleek.io | Free | Free description-to-diagrams tool for developers. Create informal UML class, object, or entity-relationship diagrams using your keyword. | 2026-08-13 |
| Ilograph | Free | interactive diagrams that allow users to see their infrastructure from multiple perspectives and levels of detail. Charts can be expressed in code. The free tier has unlimited private diagrams with up to 3 viewers. | 2026-08-08 |
| Kumu.io | Free | Relationship maps with animation, decorations, filters, clustering, spreadsheet imports, etc. The free tier allows unlimited public projects. Graph size unlimited. Free private projects for students. Sandbox mode is available if you prefer not to leave your file publicly online (upload, edit, download, discard). | 2026-08-09 |
| Lucidchart | Free | An online diagram tool with collaboration features. Free plan with three editable documents, 100 professional templates, and basic collaboration features. | 2026-08-11 |
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