Mermaid is a JavaScript-based diagramming and charting tool that uses Markdown-inspired syntax to generate visualizations. It's commonly used for flowcharts, sequence diagrams, Gantt charts, class diagrams, and more. Developers love Mermaid for its simplicity, ease of integration into documentation, and ability to create dynamic, up-to-date diagrams directly from code. This open-source tool is perfect for technical documentation, presentations, and collaborative design. Because these diagrams are text-based, they can be version controlled!
Mermaid's release frequency has varied significantly since December 2014. Initially, releases were frequent, but periods of inactivity were common from 2015 to 2018. Release frequency increased in 2019-2021 and became more consistent with occasional gaps. 2023 showcased a moderate release cadence. 2024 and 2025 releases have been less frequent, with several months having no releases.
Mermaid's npm package downloads show a consistent upward trend between March 2024 and August 2025, growing from 2.5 million to over 6.1 million. The rate of growth appears to have accelerated in the first half of 2025. September 2025 downloads are incomplete.
