Mermaid Pricing
Starting price
$8/month
Pricing model
Free
Free tier
Yes
Free trial
Yes
Plans
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Open Source | $0 | month | MIT licensed; Flowcharts & diagrams; Text-to-diagram |
| Basic | $0 | month | 3 diagrams; Limited AI usage; Mermaid Chart hosted |
| Plus | $8 | month | Unlimited diagrams; Scalable AI usage; Team collaboration |
| Premium | — | month | Massive AI usage; SSO; Knowledge management |
Figures are the vendor's published prices. Unknown values show as “—”. Price-history tracking is not yet available for this tool. Price verified 2026-09-27. Last updated 2026-10-08.
True cost
True cost calculator
| Plan | Listed | Seat basis | Monthly · 5 seats | Annual · 5 seats |
|---|---|---|---|---|
| Open Source | $0/month | flat | $0 | $0 |
| Basic | $0/month | flat | $0 | $0 |
| Plus | $8/month | flat | $8 | $96 |
Estimate from published prices. Per-seat plans scale with seats; flat plans don't; plans with included seats charge the base until you exceed them, then add the per-seat overage where published. Monthly/annual come from each plan's billing period. Taxes and add-ons excluded.
Mermaid's starting price ($8) is 74% below the Productivity & Collaboration average of $31.