Best AI Diagram Generators in 2026
Updated
In short: Creately is ranked #1 of 32 as of 4 October 2026, ahead of Nimbalyst and OpenCharts. The best-ranked option with a free plan is Nimbalyst. The lowest first paid tier on this page is ArchitectureDiagram.ai at $4.99/mo.
Turning an idea into a diagram can involve generating it, bringing in an existing diagram or working with others to refine it. Compared on AI diagram limit, import and export formats, these entries show what diagram work and file handling they list. Mermaid support, platform and real-time collaboration offer additional points to weigh, alongside free-plan availability and paid-from pricing. The ranking starts with Creately, Eraser and Archway, followed by Mermaid Chart and sysdraw. Compare the listed formats and collaboration options with how you create, share and move diagrams through your workflow.
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 · 7.9 Free plan · Free
#2 Nimbalyst Runner-up · 7.4 Free plan · $16.67/mo
#3 OpenCharts Also great · 7.4 Free plan · $9.99/mo- Free planFree trial apiLinuxmacOSself-hostedWebWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free plan iOSLinuxmacOSWindows
- Free plan
- Yes
- Paid from
- 20 /user/mo
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial$16.67/mofirst paid tier About NimbalystVisit site - Free plan apimacOSWebWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial$9.99/mofirst paid tier About OpenChartsVisit site - Free planFree trial apiextensionWeb
- Free plan
- Yes
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial$12/mofirst paid tier About Mermaid ChartVisit site - Free plan apiWeb
- Free plan
- Yes
- Mermaid support
- Yes
- Real-time collaboration
- No
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial$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
RecognisedDocumentedPlatformsFree planFree trial$12/mofirst paid tier About ArchwayVisit site - Free plan apiextensionself-hostedWeb
- Free plan
- Yes
- Paid from
- 15 /user/mo
- Real-time collaboration
- Yes
RecognisedDocumentedPlatformsFree planFree trial$15/mofirst paid tier About EraserVisit site - Free plan Web
- Free plan
- Yes
- AI diagram limit
- 300 /mo
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial$6/mofirst paid tier About sysdrawVisit site - Free plan apiself-hostedWeb
- Free plan
- Yes
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial$5/mofirst paid tier About LetDrawVisit site - WindowsmacOSLinux
- Free plan
- Yes
- Mermaid support
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- No
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Paid from
- 5 /user/mo
- Mermaid support
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Real-time collaboration
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Mermaid support
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Diagram import
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
- Mermaid support
- Yes
RecognisedDocumentedPlatformsFree planFree trial
Is your tool 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 Specifiction?
Creately is ranked #1 of 32 with a score of 7.9. Nimbalyst 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 what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing. Paid placements never change a rank.