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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| Lucidchartlucidchart.com | diagrams.netdiagrams.net | Whimsicalwhimsical.com | Cogglecoggle.it | |
|---|---|---|---|---|
| What it does | Polished diagramming with real-time collaboration and smart layout | Full diagram editor that works without an account or a saved file | Flowcharts, wireframes, mind maps and docs on one fast canvas | Mind maps that stay readable as branches multiply |
| What it costs you | Free tierA genuinely usable free tier with paid plans for volume or team features. | No sign-upWorks the moment the page loads. No account, no email, no trial. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. |
| Your files | Runs on their server | Runs on your device | Runs on their server | Runs on their server |
| Where it stops | Free accounts get three editable documents with a 60-object cap each, and lines count as objects. | No automatic layout — a fifty-box diagram is fifty boxes you positioned yourself. | The free plan caps shared boards — the moment you invite someone, the board counts against a small allowance. | Only three private diagrams on the free plan — diagram four onwards is created public. |
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| Category | Diagrams & Whiteboards | Diagrams & Whiteboards | Diagrams & Whiteboards | Diagrams & Whiteboards |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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