Mermaid Plus
The Mermaid Plus plan costs $10 per user / month, billed annually ($120 a year).
What the plan includes
Unlimited diagrams with no size limit and 300 AI credits per year, for individuals who diagram often.
As stated on mermaid.aiThe plans either side of it
- Basic$0one below
3 diagrams with a limited diagram size, 15 AI credits, and one team and project. Co-editing and external sharing are included.
- Premium$20 per user / month, billed annually ($240 a year)one above
Everything in Plus, plus 2,000 AI credits per year, unlimited free viewer seats, and unlimited teams and projects.
What else costs about this much
| Tool | Starts at | Free plan |
|---|---|---|
| WebSequenceDiagrams | $10 a month | Yes |
| Whimsical | $10 a month | Yes |
| Milanote | $9.99 a month | Yes |
| Mural | $9.99 a month | Yes |
| SmartDraw | $10.95 a month | No |
| Kumu | $9 a month | Yes |
Each tool’s own starting price, within a quarter of what this plan costs. A starting price is not the same plan, so read what each one includes before weighing them against each other.
Mermaid Plus questions
How much is the Mermaid Plus plan?
The Mermaid Plus plan costs $10 per user / month, billed annually ($120 a year). Unlimited diagrams with no size limit and 300 AI credits per year, for individuals who diagram often.
What is the difference between Mermaid Basic and Plus?
Basic costs $0 and gives you 3 diagrams with a limited diagram size, 15 AI credits, and one team and project. Co-editing and external sharing are included. Plus costs $10 per user / month, billed annually ($120 a year) and gives you unlimited diagrams with no size limit and 300 AI credits per year, for individuals who diagram often.
Is it worth moving from Plus to Premium?
That depends on what you need. Premium costs $20 per user / month, billed annually ($240 a year) and adds everything in Plus, plus 2,000 AI credits per year, unlimited free viewer seats, and unlimited teams and projects. The listing is what each plan states; neither plan is graded on its own.
Does Mermaid have a free plan or a trial?
Yes. Basic plan: 3 diagrams (the comparison table on the same page says up to 6) with a limited diagram size, 15 AI credits, one team and project, and co-editing and external sharing. There is also a free trial of Plus or Premium; the vendor does not state how long it lasts.
When was this checked?
Oct 6, 2026, against https://mermaid.ai/pricing. Vendors change prices and plans without notice, so confirm on their site before you buy.