Every free diagramming tier that clears our bar in 2026: 10 offers meet the criteria and 0 are demoted with a named reason. Verified pricing, recorded changes, and a published ranking method.
Free description-to-diagrams tool for developers. Create informal UML class, object, or entity-relationship diagrams using your keyword.
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. Best for unlimited usage needs.
An online diagram tool with collaboration features. Free plan with three editable documents, 100 professional templates, and basic collaboration features.
Collaborative whiteboard — 3 editable boards, unlimited team members, 10 AI credits/month, 5 Talktracks, 160+ app integrations including Zoom, Slack, and Google Drive Best for unlimited usage needs.
Online diagrams stored locally in Google Drive, OneDrive, or Dropbox. Free for all features and storage levels
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). Best for students and unlimited usage needs.
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.
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. Best for unlimited usage needs.
Free and open-source online database diagram editor with no signup required.
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. Best for unlimited usage needs.
Nothing in this category is demoted today — we hold no disqualifying record against any of these offers.
| Vendor | Free Tier | Key Limits | Stability | Verified |
|---|---|---|---|---|
| gleek.io | Free | Free description-to-diagrams tool for developers. Create informal UML class, object, or entity-relationship diagrams usi... | — | 2026-08-13 |
| Ilograph | Free | interactive diagrams that allow users to see their infrastructure from multiple perspectives and levels of detail. Chart... | — | 2026-08-08 |
| Lucidchart | Free | An online diagram tool with collaboration features. Free plan with three editable documents, 100 professional templates,... | stable | 2026-08-11 |
| Miro | Free | Collaborative whiteboard — 3 editable boards, unlimited team members, 10 AI credits/month, 5 Talktracks, 160+ app integr... | — | 2026-08-12 |
| diagrams.net | Free | Online diagrams stored locally in Google Drive, OneDrive, or Dropbox. Free for all features and storage levels | — | 2026-08-10 |
| Kumu.io | Free | Relationship maps with animation, decorations, filters, clustering, spreadsheet imports, etc. The free tier allows unlim... | — | 2026-08-09 |
| tldraw.com | Free | Free open-source white-boarding and diagramming tool with intelligent arrows, snapping, sticky notes, and SVG export fea... | — | 2026-08-05 |
| Cloudcraft | Free | AWS/Azure architecture diagramming — Free plan: single user only, manual diagrams limited to a 12x15 component grid, unl... | stable | 2026-08-26 |
| drawDB | Free | Free and open-source online database diagram editor with no signup required. | — | 2026-08-02 |
| cacoo.com | Free | Online real-time diagrams (flowchart, UML, network). Free plan: unlimited users, 6 sheets max, real-time editing, PNG ex... | stable | 2026-09-05 |
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