Join 3,200+ engineers who diagram smarter

Export professional diagrams without watermarks. High-res up to 8x. AI-powered generation.

492 diagrams exported this week

FeatureFreePro
Export quality1x with watermarkUp to 8x, no watermark
AI Generation200/month
AI Error Repair200/month
Cloud Sync50 diagrams
Themes3 basicAll premium themes
SupportCommunityPriority

Free

Get started, no account needed

$0/forever

Your current plan

  • All 21 diagram types
  • Basic export (1x PNG)
  • Watermark on exports
  • No AI features
  • No cloud sync
  • No high-res export
Most Popular

Pro

For professionals and teams

$7/month

No charge for 7 days · Then $7/mo

  • All 21 diagram types
  • No watermark on exports
  • High-res exports (up to 8x)
  • AI Diagram Generation (200/mo)
  • AI Error Repair (200/mo)
  • Premium themes
    Soon
  • Cloud sync (50 diagrams)
  • Priority rendering
Best Value

Lifetime

Pay once, use forever

$19one-time

Equivalent to ~3 months of Pro

  • Everything in Pro — forever
  • No watermark on exports
  • High-res exports (up to 8x)
  • AI Diagram Generation (200/mo)
  • AI Error Repair (200/mo)
  • Cloud sync (50 diagrams)
  • One-time payment, no subscription
  • All future Pro features included

Power

For power users and automation

$99/month
  • Everything in Pro
  • Unlimited AI generation & repair
  • REST API access
  • White-label exports (custom branding)
  • CLI access
    Soon
  • Bulk export
    Soon
  • Priority support
Secured by Stripe
7-day money-back guarantee
Cancel anytime

Frequently Asked Questions

Can I cancel anytime?

Yes. Cancel your subscription at any time. You'll keep Pro access until the end of your billing period.

What payment methods do you accept?

We accept all major credit cards via Stripe. Your payment information is never stored on our servers.

What happens to my diagrams if I downgrade?

Your diagrams are always yours. If you downgrade, exports will include a watermark and scale is capped at 2x, but all your work is preserved.

What does "Lifetime" mean?

Lifetime means for the lifetime of the product. You pay once and get Pro access for as long as Mermaid Editor exists. All future Pro features are included at no extra cost.

Do you offer refunds?

Yes, we offer a 7-day money-back guarantee. Contact us if you're not satisfied.

What's included in the Power plan?

The Power plan includes everything in Pro plus unlimited AI, REST API access, white-label exports with custom branding, and priority support. CLI access and bulk export are coming soon.

Is there a free trial?

Yes! Start a 7-day free trial of Pro — no charge until day 8. Cancel anytime during the trial and you won't be billed.

Can I switch between monthly and annual billing?

Yes. You can switch at any time from your account settings. Switching to annual saves you up to 29%.