July 7, 2026
Diagram drama just got connected
Show HN: Free Mermaid Diagram Editor
A free diagram toy drops and commenters instantly turn it into a rant about bad tools
TLDR: A new free browser tool lets people make and export Mermaid diagrams without signing up, with optional GitHub connection for auto-generated code maps. Commenters were less interested in the launch itself than in roasting paid, clunky alternatives and arguing over whether Mermaid is even worth using.
A new free Mermaid diagram editor just landed on Show HN, promising a very simple pitch: open the page, start drawing, export images, share a link, and never hand over your email. If you want more, you can connect GitHub so the tool can turn your code into architecture diagrams and keep them updated after changes. On paper, it’s a neat little utility. In the comments, though? Oh, the real show was the group therapy session.
The loudest mood was pure frustration with the existing Mermaid world. One commenter didn’t mince words, saying the official editor “sucks” after putting features behind a paywall and nudging people to sign up. Another said they were told to learn Mermaid, only to discover the whole ecosystem “absolutely sucks,” which is less a review and more a cry for help. That pain made this stripped-down, no-sign-up editor feel like a tiny act of rebellion.
Not everyone came to fight. Some were just relieved. One user praised the clean interface because they could finally paste in diagrams generated by artificial intelligence and see what worked, after even Microsoft Copilot apparently fumbled so badly it couldn’t make files that Visio could open. Meanwhile, the classic internet side quest arrived right on cue: Why use Mermaid at all when Graphviz already exists? Another commenter tossed in Kroki as the overachiever friend who supports Mermaid and a bunch of other text-based diagram tools. So yes, the app got attention — but the comments turned into a spicy referendum on bad software, old favorites, and developers being one more login screen away from losing it.
Key Points
- •The article introduces a free browser-based Mermaid diagram editor from Moxie Docs with no sign-up, no limits, and no watermarks.
- •The editor provides live preview, snippet/example loading, and instant export to SVG and PNG.
- •It supports all core Mermaid diagram types, including flowcharts, sequence diagrams, class diagrams, ER diagrams, gantt charts, mindmaps, pie charts, state diagrams, and git graphs.
- •Diagrams are encoded in the URL query parameter for sharing, bookmarking, and collaboration without server-side storage.
- •Users can optionally connect a GitHub repository so Moxie can generate architecture diagrams and searchable documentation and refresh them on every merge.