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u/Technical_Frosting

▲ 10 r/Jetbrains+1 crossposts

Mermaid Studio just got a free tier (Mermaid Studio Core)

I've been building the Mermaid Studio plugin for IntelliJ since November, and released it a couple of months ago. It's a full IDE language implementation for Mermaid.js: per-diagram-type parsers for all 26 native types, code intelligence, visual editing, Markdown integration, and an MCP server for AI agents. Until last week it was paid-only. Now there's a freemium option, Mermaid Studio Core, with both free and paid tiers. Its paid tier offers enhanced language support for a subset of diagram types at a lower price than the full Mermaid Studio.

Here are the details.

Under the hood: Custom GrammarKit parsers generate full PSI trees for each of Mermaid's 26 native diagram types, supporting multiple bundled Mermaid versions, so diagrams don't silently break when upstream ships a breaking change.

Those rich syntax trees power semantic highlighting across all tiers, and drive the paid tiers' contextual completions, 100+ inspections, refactoring, find-usages, structure view, formatter, and the diagram analysis MCP tool. Completions are grammar-aware: they suggest valid keywords, operators, shapes, icons, node IDs, and class names based on where you are in the diagram's syntax.

The tiers:

  • Free (Mermaid Studio Core without a paid license) — syntax highlighting, live preview, Markdown integration, PNG/SVG export for all 26 diagram types. Just install it.
  • Core ($49/yr personal) — full code intelligence for the 6 diagram types devs reach for daily (Flowchart, Sequence, Class, State, ER, Block). Also unlocks visual editing tools (drag-and-drop flowchart editor and style pane), IDE support for theme CSS, an MCP server for AI agents (including local models), and workflow features like diagram sync (automatic export), print/save as PDF, and custom icon set import.
  • Studio ($99/yr personal) — same tooling, with code intelligence extended to every supported diagram type.

Recent releases:

2026.2.2

  • Mermaid 11.14.0 with six new Neo and Redux themes
  • CSS language injection into your frontmatter config.themeCSS block, with class-name completion drawn from both your classDef names and the live rendered preview's DOM
  • Wardley Map and TreeView diagram types (beta)
  • Added a new Copy as PNG action and grouped all export actions in the context menu, now also available inside Markdown code fences containing Mermaid diagrams

2026.2.1

  • Drag-and-drop flowchart editor with PSI-level back-writing, so comments and formatting survive visual edits
  • Style pane for editing flowchart element properties (shape, fill, stroke, icons, click actions) without writing CSS
  • Reworked pan/zoom with trackpad pinch support on macOS
  • German, Simplified Chinese, Japanese, Korean UI translations (these are generated with Opus 4.6 and are entirely opt-in, not tied to the IDE's language setting)

Links

Happy to answer questions or take feature requests.

reddit.com
u/Technical_Frosting — 6 days ago