Best AI Diagram Generators in 2026
Updated
In short: ArchitectureDiagram.ai is ranked #1 of 32 as of 7 October 2026, ahead of Archway and Creately. The best-ranked option with a free plan is Archway. The lowest first paid tier on this page is Lucid Train at $2.50/mo.
From an initial idea to a diagram ready to share, the right tool depends on how you create and revise visuals. Compared on AI diagram limit, diagram import, and Mermaid support, the entries also specify export formats, platform, and real-time collaboration. Free-plan availability and paid-from pricing provide further comparison points. ArchitectureDiagram.ai, Archway, and Creately are among the options shown, alongside Eraser and OpenCharts. Check whether you need to work from existing diagrams, use Mermaid, collaborate in real time, or export to particular formats, then weigh those needs against the listed plan and platform details.
32 AI diagram generators ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
AI Diagram Generators, one module each. A lit port is something its maker publishes; 8 of the 25 on this page have a public API.
- 01 ArchitectureDiagram.ai API yesOSS not on recordFREE yesDOCS 7.4$4.99/mo
- 02 Archway API yesOSS not on recordFREE yesDOCS 7.4$12/mo
- 03 Creately API yesOSS not on recordFREE yesDOCS 7.4Free
- 04 Eraser API yesOSS not on recordFREE yesDOCS 7.4$15/mo
- 05 OpenCharts API yesOSS not on recordFREE yesDOCS 7.4$9.99/mo
- 06 flow-chart.io API yesOSS not on recordFREE yesDOCS 7.3$19/mo
- 07 LetDraw API yesOSS not on recordFREE yesDOCS 7.3$5/mo
- 08 Mermaid Chart API yesOSS not on recordFREE yesDOCS 7.3$12/mo
- 09 Nimbalyst API not on recordOSS not on recordFREE yesDOCS 6.0$16.67/mo
- 10 sysdraw API not on recordOSS not on recordFREE yesDOCS 6.0$6/mo
- 11 Lucid Train API not on recordOSS not on recordFREE yesDOCS 5.9$2.50/mo
- 12 OpenFlowKit API not on recordOSS not on recordFREE yesDOCS 5.9Free
- 13 FlowChartAI API not on recordOSS not on recordFREE not on recordDOCS 5.4
- 14 yUML API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 15 AI Diagram Maker API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 16 Diagrams.so API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 17 InfraSketch API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 18 Splotch API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 19 AI Flowchart API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 20 Archflow API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 21 ArchGPT API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 22 Archi API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 23 AutoUML API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 24 diagram.ch API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 25 FlowCraft API not on recordOSS not on recordFREE not on recordDOCS 5.0
Compare all 25 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | AI diagram limit | Mermaid support |
|---|---|---|---|---|---|---|---|---|
| 1 | ArchitectureDiagram.ai | 7.4 | Free plan | $4.99/mo | Yes | — | — | Yes |
| 2 | Archway | 7.4 | Free plan | $12/mo | Yes | — | 50 /mo | Yes |
| 3 | Creately | 7.4 | Free plan | Free | Yes | — | — | — |
| 4 | Eraser | 7.4 | Free plan | $15/mo | Yes | 15 /user/mo | — | — |
| 5 | OpenCharts | 7.4 | Free plan | $9.99/mo | Yes | — | — | — |
| 6 | flow-chart.io | 7.3 | Free plan | $19/mo | Yes | — | — | Yes |
| 7 | LetDraw | 7.3 | Free plan | $5/mo | Yes | — | — | Yes |
| 8 | Mermaid Chart | 7.3 | Free plan | $12/mo | Yes | — | — | Yes |
| 9 | Nimbalyst | 6.0 | Free plan | $16.67/mo | Yes | 20 /user/mo | — | Yes |
| 10 | sysdraw | 6.0 | Free plan | $6/mo | Yes | — | 300 /mo | Yes |
| 11 | Lucid Train | 5.9 | Free plan | $2.50/mo | Yes | — | — | Yes |
| 12 | OpenFlowKit | 5.9 | Free plan | Free | Yes | — | — | Yes |
| 13 | FlowChartAI | 5.4 | No | — | — | — | — | Yes |
| 14 | yUML | 5.2 | No | — | Yes | 5 /user/mo | — | Yes |
| 15 | AI Diagram Maker | 5.1 | No | — | Yes | — | — | Yes |
| 16 | Diagrams.so | 5.1 | No | — | Yes | — | — | No |
| 17 | InfraSketch | 5.1 | No | — | Yes | — | — | Yes |
| 18 | Splotch | 5.1 | No | — | Yes | — | — | — |
| 19 | AI Flowchart | 5.0 | No | — | Yes | — | — | — |
| 20 | Archflow | 5.0 | No | — | Yes | — | — | — |
| 21 | ArchGPT | 5.0 | No | — | Yes | — | — | — |
| 22 | Archi | 5.0 | No | — | Yes | — | — | — |
| 23 | AutoUML | 5.0 | No | — | Yes | — | — | — |
| 24 | diagram.ch | 5.0 | No | — | Yes | — | — | Yes |
| 25 | FlowCraft | 5.0 | No | — | Yes | — | — | Yes |
Is your platform on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which AI diagram generator is ranked first on Inferse?
ArchitectureDiagram.ai is ranked #1 of 32 with a score of 7.4. Archway is second and Creately third.
How many of these have a free plan?
12 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Lucid Train has the lowest first paid tier we found: $2.50/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.