Best AI Diagram Generators in 2026
Updated
In short: Creately is ranked #1 of 32 as of 4 October 2026, ahead of Mermaid Chart and OpenCharts. The best-ranked option with a free plan is Mermaid Chart. The lowest first paid tier on this page is ArchitectureDiagram.ai at $4.99/mo.
Turning a prompt or idea into a diagram is only part of the workflow; bringing in existing diagrams and sharing or exporting the result may matter too. Mermaid Chart, Creately, and Eraser lead the opening entries. Compare AI diagram limits with diagram import and export formats, and check Mermaid support if that is part of your process. Platform availability and real-time collaboration can help distinguish how the tools fit your working habits. Free-plan availability and paid-from details add plan and cost considerations. The ranking order and listed fields can guide which options you explore against your diagramming needs.
32 AI diagram generators ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#1 Creately Top pick · 8.0 Free plan · Free
#2 Mermaid Chart Runner-up · 7.6 Free plan · $12/mo
#3 OpenCharts Also great · 7.3 Free plan · $9.99/mo- Free planFree trial apiLinuxmacOSself-hostedWebWindows
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Free planFree trial apiextensionWeb
- Free plan
- Yes
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms$12/mofirst paid tier About Mermaid ChartVisit site - Free plan apimacOSWebWindows
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms$9.99/mofirst paid tier About OpenChartsVisit site - Free plan apiWeb
- Free plan
- Yes
- Mermaid support
- Yes
- Real-time collaboration
- No
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms$4.99/mofirst paid tier About ArchitectureDiagram.aiVisit site - Free plan apiself-hostedWeb
- Free plan
- Yes
- AI diagram limit
- 50 /mo
- Mermaid support
- Yes
- Real-time collaboration
- Yes
RecognisedDocumentedFree planFree trialPlatforms$12/mofirst paid tier About ArchwayVisit site - Free plan apiextensionself-hostedWeb
- Free plan
- Yes
- Paid from
- 15 /user/mo
- Real-time collaboration
- Yes
RecognisedDocumentedFree planFree trialPlatforms$15/mofirst paid tier About EraserVisit site - Free plan iOSLinuxmacOSWindows
- Free plan
- Yes
- Paid from
- 20 /user/mo
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms$16.67/mofirst paid tier About NimbalystVisit site - Free plan Web
- Free plan
- Yes
- AI diagram limit
- 300 /mo
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms$6/mofirst paid tier About sysdrawVisit site - Free plan apiself-hostedWeb
- Free plan
- Yes
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms$5/mofirst paid tier About LetDrawVisit site - WindowsmacOSLinux
- Free plan
- Yes
- Mermaid support
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Paid from
- 5 /user/mo
- Mermaid support
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- No
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Mermaid support
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Diagram import
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
- Mermaid support
- Yes
RecognisedDocumentedFree planFree trialPlatforms
Is your platform 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 The Geeks Club?
Creately is ranked #1 of 32 with a score of 8.0. Mermaid Chart is second and OpenCharts 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 on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on. Paid placements never change a rank.