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

Feature	Free	Pro
Export quality	1x with watermark	Up to 8x, no watermark
AI Generation	—	200/month
AI Error Repair	—	200/month
Cloud Sync	—	50 diagrams
Themes	3 basic	All premium themes
Support	Community	Priority

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

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%.