Mermaid
by Mermaid · Text-based diagramming library with a paid collaboration platform
BenchRank score
Screenshots of Mermaid
Homepage
Overview
Mermaid is an open-source library for creating diagrams and charts from text and code, with a live editor, docs and a list of integrations. A commercial platform is built on top of it, adding stored diagrams, teams and projects, AI credits and collaboration. Paid plans add co-editing, external sharing, viewer seats and SSO.
- Best for
- Teams who write diagrams as text and want shared editing on top of the open-source Mermaid library.
- Pricing
- Free Basic tier, then $10 per user/month for Plus and $20 per user/month for Premium, both billed annually, with Enterprise priced on request.
Strengths and trade-offs
Strengths
- Open-source diagramming library with a free live editor
- Free Basic tier for simple diagrams and one team
- Premium adds SSO, co-editing and unlimited viewer seats
- Docs, tutorials and an integrations list are published
Trade-offs
- Basic caps diagrams and limits diagram size to 60
- AI is metered: 15 credits on Basic, 300 on Plus, 2,000 on Premium
- Listed prices are billed annually; monthly rates are not shown
- SSO and viewer seats require Premium at $20 per user/month
How Mermaid markets itself
A structured read of the promise, proof and page design on Mermaid’s captured homepage.
Homepage capture
“Mermaid”
- Angle: Open source / ownership
- Hero: Code snippet
Pricing
Published plans and prices from Mermaid’s own pricing page.
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
MCP support
Whether an agent can drive the product through the Model Context Protocol, and how much setup that takes.
API quality
Public API surface: machine-readable spec, official SDKs, documented auth, errors, rate limits and versioning.
Documentation
Publicly reachable docs — coverage, freshness, code samples and machine readability.
Agent friendliness
How readable the site is to an automated client: llms.txt, structured data, server-rendered content, crawler access.
Pricing transparency
Whether real prices are published, self-serve signup exists, and usage costs are knowable without a sales call.
Changelog
A public, dated record of what shipped and when — the clearest signal that a product is still alive.
Marketing site structure
Whether the site answers a buyer's questions: clear positioning, the pages that matter, and accessibility.
Page speed
How fast the site loads for real visitors: Chrome UX Report 75th-percentile LCP, INP and CLS, with a Lighthouse mobile run standing in where a site has too little traffic for field data.
Operational trust
Status page and incident history, security disclosure, compliance and data-processing documentation.
Measured, but not part of the score
Useful to know, but not a mark for or against the product — so these do not affect the ranking.
Openness
Source availability, self-hosting, data export and open standards. Scored and shown, but not part of the composite — paid SaaS is not worse for being paid SaaS.
Maintenance
Release cadence and repository activity. Scored and shown, but not part of the composite — it is only measurable for open repositories.
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Where this comes from
The Mermaid pages BenchRank reads when it scores the product — its documentation, release notes, status and security pages, and its repository where there is one.
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Is this your product?
Claim Mermaid to manage its profile. Claiming lets you suggest edits to the descriptive fields — it never changes scores or rankings.