Mermaid Chart
Verified Oct 15, 2026 ActiveTurns text, code, or prompts into flowcharts, sequence diagrams, and Gantt charts, from the Mermaid.js team.
Listed on EffectHub ·
Pricing
- Pricing model
- Freemium
- Paid options from
- $80/yr
- Billing
- Yearly
Pro plan runs $80 per user per year, unlocking unlimited diagrams, AI diagramming, and multi-user editing over the free plan's five-diagram cap.
Use tool ↗About Mermaid Chart
Mermaid Chart is a diagramming platform built by the team behind the open-source Mermaid.js library, converting text descriptions, code, or documents into flowcharts, sequence diagrams, ER diagrams, Gantt charts, and timelines. It supports AI-prompted generation as well as direct Mermaid syntax editing, real-time collaboration, and integrations with tools like VS Code and Confluence. The vendor's own domain, mermaidchart.com, now redirects permanently to mermaid.ai under the same product. The company, Mermaid Chart, is US-based. The free plan covers a handful of diagrams; the Pro plan is the entry paid tier, billed annually per user.
- Platforms
- Web · VS Code extension
- API
- Not confirmed
- Last verified
- Oct 15, 2026
Verified sources
- Confirms mermaidchart.com now redirects permanently to mermaid.ai under the same productmermaid.ai ↗
- Third-party pricing tracker lists Free/Pro at $80 per user per year/Enterprise tiers for Mermaid Chartspotsaas.com ↗
Is Mermaid Chart legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Domain registered
- Dec 16, 2017 (8 years ago)Registry record (RDAP), registrar Porkbun LLC, looked up Sep 14, 2026
- TLS certificate
- Issued by Amazon, valid until Feb 23, 2027Seen in our own connection to the site on Oct 15, 2026
- Last checked
- Oct 15, 2026The site answered
- On the market since
- 2022The vendor's own material, read by us
- Operated by
- Mermaid Chart, United StatesOur research, card verified Sep 1, 2026
Pros & cons of Mermaid Chart
Being built by the Mermaid.js maintainers themselves is the real edge here: diagrams-as-code that developers already write in markdown get a proper collaborative editor and AI-assisted generation on top, instead of a third party reverse-engineering the syntax. The free tier's five-diagram cap is tight, and the vendor's recent rebrand from mermaidchart.com to mermaid.ai makes some third-party pricing pages describing it look slightly out of date.
Pros
- built and maintained by the original Mermaid.js open-source team
- generates diagrams from plain text or AI prompts, or direct syntax editing
- real-time multi-user collaboration
- integrations with VS Code, Confluence, and similar developer tools
Cons
- free plan is capped at five diagrams
- recent domain move from mermaidchart.com to mermaid.ai has left some third-party listings referencing the old pricing page
- per-user annual billing can add up for larger teams versus flat team pricing
Best for
- developers already writing Mermaid syntax who want a hosted editor
- teams wanting diagrams generated from text or code with light AI assistance
Not for
- users who need more than five diagrams without paying
- teams wanting a general-purpose whiteboard rather than code-driven diagrams
Watch out: The product recently moved its primary domain from mermaidchart.com to mermaid.ai; use the new domain directly rather than relying on older bookmarks or third-party links.
Alternatives to Mermaid Chart
Mermaid Chart head-to-head
Side-by-side fact sheets against the competitors our research or their makers name — pricing, platforms, API and both verdicts on one page.
AI tools by profession
Diagramming & Whiteboards is one of the jobs on this page: