Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
AI UX intelligence system for product designers and founders
Stage
Not given
Startup
Founded
Not given
2025
Based in
Not given
IN
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
Free: $0/month with 100,000 tokens (about 15 questions or 3 screen reviews). Pro Quarterly: $57 billed quarterly (about $19/month) with 1.9 million tokens (about 215 questions or 70 screen reviews). Pro Yearly: $131 billed yearly (about $10.92/month) with 1.9 million tokens.
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
Ask UX questions and get answers citing verified guidelines
Audit screens measuring contrast, tap targets and text sizes from pixels
Library of 50 free UX laws and guidelines
Multiple AI model comparison for design analysis
UX prompt optimization
Unified consensus on design decisions
Projects that remember product context
Every finding cites its source guideline
Access to Claude Opus 5, Gemini Pro and Deep Research on Pro plans
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
Every finding cites a verified guideline, not an opinion or guess
Measures what it claims using pixel-level data, not guesses
Built by certified UX professional with 19 years of practice
Answers backed by universal UX/UI/CRO principles and human psychology research
Instant feedback at every stage instead of waiting days for design reviews
Mermaid Viewer
ProUX