Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Design App Store and Google Play screenshots with templates or AI, translate them into 87 languages and A/B test them.
Stage
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Founded
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Based in
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Pricing model
Freemium
Freemium
Pricing
Free: unlimited editor and preview, 3 saved diagrams, 5 AI uses total, PNG export 1× with watermark. Starter: $6.99/month or $69.90/year; 30 saved diagrams, 500 AI conversations per month, PNG export up to 4× without watermark. Pro: $11.99/month or $119.90/year; unlimited diagrams, unlimited AI, PNG
Lite: Free forever. Pro: $19/mo or $228/year (save $120). Studio: $49/mo or $588/year (save $360). Founding offer: FOUNDING30 takes 30% off the first year of a yearly plan, for the first 200 customers.
Key features
Live preview of Mermaid code as you type
AI diagram generator, editor and syntax fixer
PNG export on every plan; JPG, SVG and PDF on Pro
All 22+ Mermaid diagram types supported
Share diagrams via public links and embeds
Save diagrams to cloud with folders and version history
Keyboard shortcuts and autocomplete
Mobile-responsive editor with pan and pinch-zoom
Snap grid for precise alignment on every screen size
Design once for all 16 App Store and Google Play sizes automatically
AI Designer that creates three original designs with headlines
Translate text into all 87 App Store and Google Play languages
Publish directly to App Store Connect and Google Play in one click
A/B test product page variants and track results
Pro templates built around real app screens
Realistic device frames in multiple styles and finishes
Library of 1,512 icons, 69 brand logos and other graphics
Access to all Google Fonts and 1,900+ typefaces
What makes it different
No account or sign-up required to start editing diagrams
Affordable pricing: Starter at $6.99/month, Pro at $11.99/month
Diagrams render in your browser; nothing stored unless you choose to save
Fast editor with instant rendering and clear error messages
AI Designer creates original designs from app descriptions, never repeating templates and based on research of 290 top listings
One design automatically adapts to all device sizes for both App Store and Google Play at exact pixel dimensions
Translate into any of 87 languages with one click AI translation, then fine-tune by hand
Free Lite plan forever with no credit card, 1 app and 2 languages
Mermaid Viewer
Apptune