Best AI Diagram Generators in 2026
Updated
If you need to turn an idea into a diagram, or bring an existing diagram into a tool for further work, compare the capabilities that match your process. These 32 entries are ranked and compared on AI diagram limit, diagram import, export formats, and Mermaid support, along with platform, real-time collaboration, free plan, and paid-from price. Eraser, Archway, and OpenFlowKit are among the opening options. Check which formats you need to import or export, whether Mermaid fits your workflow, and whether collaborators need to work together in real time. The listed plan and platform details can help you weigh those needs against availability and cost.
23 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | CreatelyWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | Free | 6.7 | |
| 2 | InfraSketchWeb · Windows · Mac · Linux | Three bars | — | 4 of 6 | Free | 6.6 | |
| 3 | NimbalystWindows · Mac · Linux · iPhone | Three bars | — | 4 of 6 | $16.67/mo | 6.6 | |
| 4 | OpenChartsWeb · Windows · Mac · API | Three bars | — | 3 of 6 | $9.99/mo | 6.6 | |
| 5 | Lucid TrainWindows · Mac · Linux | Three bars | — | 3 of 6 | $2.50/mo | 6.5 | |
| 6 | AI Diagram MakerWeb · API | Two bars | — | 1 of 6 | $10/mo | 6.4 | |
| 7 | AI FlowchartWeb | Two bars | — | 1 of 6 | $9/mo | 6.4 | |
| 8 | ArchitectureDiagram.aiWeb · API | Two bars | — | 1 of 6 | $4.99/mo | 6.4 | |
| 9 | ArchwayWeb · Self-hosted · API | Two bars | — | 1 of 6 | $12/mo | 6.4 | |
| 10 | Diagrams.soWeb · API | Two bars | — | 1 of 6 | $0.83/mo | 6.4 | |
| 11 | EraserWeb · Self-hosted · API · Extension | Two bars | — | 1 of 6 | $15/mo | 6.4 | |
| 12 | flow-chart.ioWeb · API | Two bars | — | 1 of 6 | $19/mo | 6.4 | |
| 13 | LetDrawWeb · Self-hosted · API | Two bars | — | 1 of 6 | $5/mo | 6.4 | |
| 14 | Mermaid ChartWeb · API · Extension | Two bars | — | 1 of 6 | $12/mo | 6.4 | |
| 15 | OpenFlowKitWeb | Two bars | — | 1 of 6 | Free | 6.4 | |
| 16 | SplotchWeb · Extension | Two bars | — | 1 of 6 | $0.92/mo | 6.4 | |
| 17 | sysdrawWeb | Two bars | — | 1 of 6 | $6/mo | 6.4 | |
| 18 | yUMLWeb · Self-hosted · API | Two bars | — | 1 of 6 | $4.17/mo | 6.4 | |
| 19 | AutoUMLWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 20 | diagram.chWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 21 | FlowChartAIWeb | One bar | — | — | 1 of 6 | — | 5.4 |
| 22 | FlowCraftWeb · Extension | One bar | — | — | 1 of 6 | $7.99/mo | 5.4 |
| 23 | GraphiteWeb | One bar | — | 1 of 6 | $8/mo | 5.2 | |
| 24 | Juggernaut Solutions Architecture Flow ToolWeb | One bar | — | 1 of 6 | Free | 5.2 | |
| 25 | OnUMLWeb · API | One bar | — | 1 of 6 | $8/mo | 5.2 |
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | AI diagram limit | Mermaid support |
|---|---|---|---|---|---|---|---|---|
| 1 | Creately | 6.7 | Free plan | Free | Yes | — | — | — |
| 2 | InfraSketch | 6.6 | Free plan | Free | Yes | — | — | Yes |
| 3 | Nimbalyst | 6.6 | Free plan | $16.67/mo | Yes | 20 /user/mo | — | Yes |
| 4 | OpenCharts | 6.6 | Free plan | $9.99/mo | Yes | — | — | — |
| 5 | Lucid Train | 6.5 | Free plan | $2.50/mo | Yes | — | — | Yes |
| 6 | AI Diagram Maker | 6.4 | Free plan | $10/mo | Yes | — | — | Yes |
| 7 | AI Flowchart | 6.4 | Free plan | $9/mo | Yes | — | — | — |
| 8 | ArchitectureDiagram.ai | 6.4 | Free plan | $4.99/mo | Yes | — | — | Yes |
| 9 | Archway | 6.4 | Free plan | $12/mo | Yes | — | 50 /mo | Yes |
| 10 | Diagrams.so | 6.4 | Free plan | $0.83/mo | Yes | — | — | No |
| 11 | Eraser | 6.4 | Free plan | $15/mo | Yes | 15 /user/mo | — | — |
| 12 | flow-chart.io | 6.4 | Free plan | $19/mo | Yes | — | — | Yes |
| 13 | LetDraw | 6.4 | Free plan | $5/mo | Yes | — | — | Yes |
| 14 | Mermaid Chart | 6.4 | Free plan | $12/mo | Yes | — | — | Yes |
| 15 | OpenFlowKit | 6.4 | Free plan | Free | Yes | — | — | Yes |
| 16 | Splotch | 6.4 | Free plan | $0.92/mo | Yes | — | — | — |
| 17 | sysdraw | 6.4 | Free plan | $6/mo | Yes | — | 300 /mo | Yes |
| 18 | yUML | 6.4 | Free plan | $4.17/mo | Yes | 5 /user/mo | — | Yes |
| 19 | AutoUML | 6.3 | Free plan | Free | Yes | — | — | — |
| 20 | diagram.ch | 6.3 | Free plan | Free | Yes | — | — | Yes |
| 21 | FlowChartAI | 5.4 | No | — | — | — | — | Yes |
| 22 | FlowCraft | 5.4 | No | $7.99/mo | Yes | — | — | Yes |
| 23 | Graphite | 5.2 | Free plan | $8/mo | Yes | — | — | Yes |
| 24 | Juggernaut Solutions Architecture Flow Tool | 5.2 | Free plan | Free | Yes | — | — | — |
| 25 | OnUML | 5.2 | Free plan | $8/mo | Yes | — | — | Yes |
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Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.