Compare 10 free diagramming tools, free tiers, and developer deals. We could not confirm today's terms for 7 of them: on 6 the page we cite did not answer, and on 1 our own read did not confirm them. Each row says why. Nothing on record contradicts our terms for Miro, cacoo.com, Lucidchart.
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 | Read / catalogue date |
|---|---|---|---|
| drawDB | Free | Free and open-source online database diagram editor with no signup required.When we last read the page we cite for this offer, on 2026-09-14, we could read no amount, tier or rate on the page, so we cannot confirm these terms today. | 2026-09-14 / 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.We could not read the page we cite for this offer when we last looked, on 2026-09-14, so we cannot confirm these terms today. | 2026-08-05 · tried 2026-09-14, no read |
| 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. | 2026-09-21 |
| 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.The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-25, so we cannot confirm these terms today. | 2026-09-25 / 2026-08-26 |
| diagrams.net | Free | Online diagrams stored locally in Google Drive, OneDrive, or Dropbox. Free for all features and storage levelsThe page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-14, so we cannot confirm these terms today. | 2026-09-14 / 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.The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today. | 2026-09-02 / 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.The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today. | 2026-09-02 / 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).The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today. | 2026-09-02 / 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 · tried 2026-09-20, no read |
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