Best AI Diagram Generators in 2026
Updated
In short: Nimbalyst is ranked #1 of 32 as of 4 October 2026, ahead of ArchitectureDiagram.ai and Archway. The best-ranked option with a free plan is ArchitectureDiagram.ai. The lowest first paid tier on this page is ArchitectureDiagram.ai at $4.99/mo.
AI diagram generators are built to help turn ideas into diagrams or support diagram work through import and export. The ranking starts with Nimbalyst, Eraser, and Archway, followed by sysdraw and OpenFlowKit. Compare the AI diagram limit with import options and export formats that fit your work. Mermaid support, platform availability, and real-time collaboration can help distinguish how each tool fits your workflow. Free-plan availability and the paid-from price provide further points to weigh. The entries are ordered as a best-of ranking; use the listed capabilities to focus on the diagram formats, collaboration, and access terms that matter to you.
32 AI diagram generators ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 1 Nimbalyst iPhone only RecognisedPhone appDocumentedFree plan 7.9$16.67/mo Mermaid support: YesReal-time collaboration: Yes
- 2 ArchitectureDiagram.ai No phone app RecognisedPhone appDocumentedFree plan 6.4$4.99/mo Mermaid support: YesReal-time collaboration: No
- 3 Archway No phone app RecognisedPhone appDocumentedFree plan 6.4$12/mo AI diagram limit: 50 /moMermaid support: YesReal-time collaboration: Yes
- 4 Creately No phone app RecognisedPhone appDocumentedFree plan 6.4Free
- 5 Eraser No phone app RecognisedPhone appDocumentedFree plan 6.4$15/mo Real-time collaboration: Yes
- 6 Mermaid Chart No phone app RecognisedPhone appDocumentedFree plan 6.4$12/mo Mermaid support: YesReal-time collaboration: Yes
- 7 OpenCharts No phone app RecognisedPhone appDocumentedFree plan 6.4$9.99/mo
- 8 sysdraw No phone app RecognisedPhone appDocumentedFree plan 6.4$6/mo AI diagram limit: 300 /moMermaid support: YesReal-time collaboration: Yes
- 9 LetDraw No phone app RecognisedPhone appDocumentedFree plan 6.3$5/mo Mermaid support: YesReal-time collaboration: Yes
- 10 yUML No phone app RecognisedPhone appDocumentedFree plan 5.4 Mermaid support: Yes
- 11 AI Diagram Maker No phone app RecognisedPhone appDocumentedFree plan 5.3 Mermaid support: Yes
- 12 Diagrams.so No phone app RecognisedPhone appDocumentedFree plan 5.3 Mermaid support: No
- 13 flow-chart.io No phone app RecognisedPhone appDocumentedFree plan 5.3 Mermaid support: Yes
- 14 InfraSketch No phone app RecognisedPhone appDocumentedFree plan 5.3 Mermaid support: Yes
- 15 Lucid Train No phone app RecognisedPhone appDocumentedFree plan 5.3 Mermaid support: Yes
- 16 OpenFlowKit No phone app RecognisedPhone appDocumentedFree plan 5.3 Mermaid support: YesReal-time collaboration: Yes
- 17 Splotch No phone app RecognisedPhone appDocumentedFree plan 5.3 Real-time collaboration: Yes
- 18 AI Flowchart No phone app RecognisedPhone appDocumentedFree plan 5.2
- 19 Archflow No phone app RecognisedPhone appDocumentedFree plan 5.2 Real-time collaboration: Yes
- 20 ArchGPT No phone app RecognisedPhone appDocumentedFree plan 5.2
- 21 Archi No phone app RecognisedPhone appDocumentedFree plan 5.2
- 22 AutoUML No phone app RecognisedPhone appDocumentedFree plan 5.2
- 23 diagram.ch No phone app RecognisedPhone appDocumentedFree plan 5.2 Mermaid support: Yes
- 24 FlowChartAI No phone app RecognisedPhone appDocumentedFree plan 5.2 Mermaid support: Yes
- 25 FlowCraft No phone app RecognisedPhone appDocumentedFree plan 5.2 Mermaid support: Yes
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which AI diagram generator is ranked first on Samsung Mobile US Press?
Nimbalyst is ranked #1 of 32 with a score of 7.9. ArchitectureDiagram.ai is second and Archway third.
How many of these have a free plan?
9 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, ArchitectureDiagram.ai has the lowest first paid tier we found: $4.99/mo.
How is this list ranked?
Ranked mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.