Simple, honest pricing
Start free without an account. Upgrade only if you need unlimited diagrams and more AI.
No account
$0
Just open the editor
- Unlimited editing & live preview
- All diagram types & themes
- PNG (up to 3x), SVG & PDF export
- Editable share links
- Local autosave in your browser
- 5 AI requests per day
Free
$0
Free account
- Everything without an account
- 25 saved diagrams
- 5 folders & tags
- Last 10 versions per diagram
- Public links & embeds
- 15 AI requests per day
Most popular
Pro
$6
per month · or $48/year
- Everything in Free
- Unlimited saved diagrams & folders
- 300 AI requests per day
- Last 100 versions per diagram
- PNG export up to 6x
- Embeds without the MermaidViewer badge
- Priority support
Pricing FAQ
Can I use MermaidViewer without paying?
Yes. The editor, preview, exports and share links are free forever, with or without an account.
How does billing work?
Pro is billed monthly or yearly through our payment partner Polar. You can cancel any time from your account page and keep Pro until the end of the billing period.
What happens to my diagrams if I downgrade?
Nothing is deleted. If you are over the Free limits you can still view, edit and export existing diagrams, but you'll need to delete some before creating new ones.
Do you offer team or education discounts?
Not yet, but we're happy to help — contact support and tell us about your use case.