Mermaid Pricing 2026

Plans, hidden costs, and cheaper alternatives compared

Is Mermaid worth the price?

90/10

Mermaid offers a very generous free tier with its open-source option and a functional 'Basic' tier for free.

The 'Plus' tier at $8/month for unlimited diagrams and scalable AI is highly competitive. This pricing structure is excellent for individual developers and small teams looking for powerful diagramming tools.

Pricing Plans

7-day Free Trial

Open Source

Free

MIT licensed
Flowcharts & diagrams
Text-to-diagram
Community support

Basic

Free

3 diagrams
Limited AI usage
Mermaid Chart hosted

Plus

$8/month

Unlimited diagrams
Scalable AI usage
Team collaboration

Premium

Custom

Massive AI usage
SSO
Knowledge management

Calculate your cost View full pricing

Hidden Costs & Gotchas

AI usage limits on Basic tier

Premium features require custom quote

No annual discount mentioned

Which Plan Do You Need?

Developers needing open-source diagramming

Individuals creating a few diagrams

Teams requiring collaboration & AI

How Mermaid Compares to Competitors

Compared to Lucidchart, which starts around $7.95/month for basic individual plans, Mermaid's 'Plus' tier at $8/month offers similar value with the added benefit of text-to-diagram and AI features. Draw.io is free and open-source like Mermaid's base, but Mermaid's paid tiers add AI and hosted solutions that Draw.io doesn't natively offer.

Mermaid Pricing FAQ

How much does Mermaid cost?

Mermaid starts at $8/month on the Plus plan. A free plan is also available with limited features.

Does Mermaid have a free plan?

Yes. Mermaid offers a free plan called "Open Source". It includes: MIT licensed, Flowcharts & diagrams, Text-to-diagram.

Does Mermaid offer a free trial?

Yes, Mermaid offers a free trial lasting 7 days. No credit card is typically required to start the trial, though this may vary.

Is there a cheaper alternative to Mermaid?

Yes. Popular alternatives to Mermaid include Whimsical, Eraser, Redash, Observable. Free alternatives include Whimsical, Eraser, Redash. Compare them side-by-side on Toolradar.