Design and diagrams

Gleek alternatives

2 open-source projects that already do this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

mermaid-js/mermaid-live-editor6,720MITWeb app to edit, preview, and share Mermaid diagrams from a textual DSL.Open on GitHub jgraph/drawio7,353Apache-2.0Client-side graphical diagram editor for creating, editing, and exporting diagrams in the browser.Open on GitHub

What you give up either way

Hosted multi-user collaboration / live collaboration
AI-powered chat diagram generation
Prebuilt templates and styling/custom themes
Integrations (Confluence, Azure DevOps) and hosted Git-backed storage
Priority support and team billing features

An open-source project doing the core job proves a replacement is possible. It does not prove it matches Gleek, and it does not prove anyone has run it for a month. How we decide.