Render Diagrams inside ChatGPT using Mermaid.js
Auto‑detects Mermaid code blocks and renders flowcharts, Gantt and UML diagrams (class, state, sequence etc.) and more - right in your chat.
Features
Auto‑render
Detects diagram code blocks and renders them instantly inside ChatGPT.
All diagram types
Flowchart, Sequence, Class, ER, Gantt, State, Pie, Journey, and more — visualize any concept.
Fast & private
Optimized for speed. Less than 100KB, minimal permissions, no tracking. Fully local.
Multiple themes
Pro users get Dark, Forest, and Neutral themes for better diagram styling.
Easy export
Copy/Download diagrams as PNG with one click.
Cross platform
Works with Chrome, Edge, and other Chromium-based browsers.
Pricing
Simple one‑time purchase. No subscriptions.
Free
$0
- ✔ Flowcharts and sequence diagrams
- ✔ Default theme
- ✔ Regular updates
- ✔ Basic support
Pro
$5
$10one‑time- ✔ Everything in Free
- ✔ All diagram types
- ✔ Multiple themes
- ✔ One-time purchase
After purchase: You'll receive a license key via email. Enter it in the extension settings to activate Pro features.
View activation guide →