Changelog

Track all the updates, new features, and improvements to SimpleMermaid

Current Version: 1.3.0

Welcome to the SimpleMermaid changelog. This page documents every update we ship, from major new features to subtle quality-of-life improvements. We believe in transparent development, so you can always see exactly what changed and why.

SimpleMermaid follows semantic versioning: major versions introduce significant new capabilities, minor versions add features and improvements, and patch versions fix bugs. We ship updates regularly based on community feedback and our own roadmap.

v1.3.0 March 23, 2026
Latest

Tabs were the most requested feature since launch. Developers frequently need to reference one diagram while building another, comparing an existing architecture with a proposed change, or keeping a sequence diagram open alongside the class diagram it references. This release makes that workflow seamless.

New Features

  • Editor Tabs - Work on multiple diagrams simultaneously with a tabbed editor interface
  • Per-tab state - Each tab preserves its own zoom level, cursor position, and scroll position
  • Tab persistence - All open tabs are saved to localStorage and restored on reload
  • Inline tab rename - Double-click any tab to rename it

Improvements

  • Loading an example renames the active tab to match
  • Loading a saved diagram opens in a new tab
  • Save modal pre-fills with the active tab name
  • Shared diagrams open in a dedicated "Shared Diagram" tab

Keyboard Shortcuts

  • Ctrl+T — New tab
  • Ctrl+W — Close active tab
  • Ctrl+Tab / Ctrl+Shift+Tab — Cycle through tabs
v1.2.7 February 22, 2026
Feature

We want to keep SimpleMermaid free and ad-free for everyone. Adding a Buy Me A Coffee link gives the community an optional way to support server hosting costs without us resorting to ads or paywalls.

New Features

  • Buy Me A Coffee support - Help keep SimpleMermaid running ad-free by supporting server costs directly

Improvements

  • Navigation hamburger menu now triggers at 1030px for better usability with extra nav items
v1.2.6 February 2, 2026
Feature

New Features

  • Zoom controls - Zoom in/out buttons (25%-200%) in preview panel header with click-to-reset percentage display
v1.2.5 January 12, 2026
Feature

New Features

  • Diagram stats display - Shows diagram type detection, node count, and edge count in real-time
  • PDF export - Export diagrams to PDF format with automatic orientation detection

Bug Fixes

  • Fixed dark mode text visibility issues in Journey diagrams
v1.2.4 January 11, 2026
Feature

New Features

  • Community Showcase diagrams - Added 3 new funny developer life diagrams (Stand-up Meeting Reality, Bug Life Cycle, Deploy Friday) contributed by emphonic.com
  • New changelog page to track all updates and improvements
  • "Recent Updates" section on landing page

Improvements

  • Better organization of Community Showcase examples
  • Enhanced footer navigation across all pages
v1.2.3 January 8, 2026
Feature

New Features

  • Zoom controls - Added zoom in/out/reset buttons for better diagram viewing
  • Mouse wheel zoom support with Ctrl/Cmd modifier
  • Pinch-to-zoom on touch devices

Improvements

  • Better handling of large diagrams
  • Improved responsive layout for mobile devices
v1.2.2 January 3, 2026

New Features

  • Community Showcase - New category for user-submitted diagrams
  • Added Broadcast Studio diagram by Lemmur Production
  • Added AWS Malware Scanning diagram by Vaishnav

Improvements

  • Templates section on landing page now links directly to examples
  • Better example categorization in dropdown menus
v1.2.1 December 20, 2024

Bug Fixes

  • Fixed dark theme rendering issues with certain Mermaid diagram types
  • Fixed URL sharing when diagram contains special characters
  • Improved error handling for invalid Mermaid syntax

Improvements

  • Better syntax error messages with line numbers
  • Faster diagram rendering performance
v1.2.0 December 10, 2024
Major

New Features

  • Security & Threat Models category - 10 new security-focused diagram templates
  • RBAC Model, Zero Trust Architecture, API Threats diagrams
  • Kubernetes Threats, CI/CD DevSecOps, Supply Chain Attack templates
  • Data Breach Flow and Incident Response diagrams

Improvements

  • Expanded System Architecture category with new templates
  • Better example organization with subcategories
  • Improved landing page with use cases section
v1.1.0 November 15, 2024
Major

New Features

  • Save & Load diagrams - Local storage support with auto-save
  • Import/Export backup - Download and restore your diagrams
  • Multiple saved diagrams management
  • Diagram naming and organization

Improvements

  • Auto-save every 30 seconds
  • Better offline support
  • Improved mobile layout
v1.0.0 October 1, 2024
Initial Release

Features

  • Live Mermaid editor with real-time preview
  • Instant URL sharing with LZ-string compression
  • Export to PNG/SVG for presentations and docs
  • Light and dark theme support
  • Horizontal and vertical layout modes
  • 20+ built-in example templates
  • Resizable editor panels
  • Mobile-responsive design
  • No account required - privacy focused

Development Roadmap

Here's what we're working on next. Our roadmap is shaped by community feedback, so if you have a feature request, we'd love to hear it.

Planned Features

  • Collaborative Editing - Real-time collaboration using WebRTC, allowing multiple users to edit the same diagram simultaneously without any server-side storage.
  • Custom Themes - Create and save custom color themes for your diagrams, with the ability to share theme presets via URL.
  • Diagram Templates Library - An expanded template system with community-contributed templates organized by industry and use case.
  • Keyboard Shortcuts Expansion - Additional shortcuts for common operations like undo/redo, find/replace within the editor, and quick diagram type switching.
  • Embed Widget - A lightweight embed code that lets you include live, editable SimpleMermaid diagrams in your documentation, blog posts, or internal wikis.

Under Consideration

  • VS Code Extension - A companion extension that integrates SimpleMermaid's preview capabilities directly into Visual Studio Code.
  • Diagram Versioning - Track changes to your diagrams over time with a local version history and visual diff view.
  • AI-Assisted Diagramming - Natural language to diagram conversion, allowing you to describe your system and generate a starting diagram automatically.
  • Presentation Mode - A full-screen, distraction-free view optimized for presenting diagrams during meetings and design reviews.