Mermaid Chart alternatives: 2 open-source picks
These 2 Mermaid Chart alternatives replace it for $0, led by Excalidraw and draw.io. All 2 are open source. License, stars and last commit checked by hand on 2026-08-29. No trials, no crippled tiers.
Virtual hand-drawn style whiteboard for sketching diagrams collaboratively
licenseMIT
runsyour server
setupnot verified by us yet — check the repo README
facts verified 2026-08-29
The diagramming workhorse — flowcharts, architecture diagrams, UML — runs fully client-side or as your own container.
licenseApache-2.0
runsyour server
setupnot verified by us yet — check the repo README
facts verified 2026-08-29
What each one is, in full: Excalidraw · draw.io
last updated 2026-08-29 · no votes, no pay-to-list · just what's real
the usual suspects · recommended everywhere, rejected here
MermaidThe diagram engine underneath the product is free, but it is still an engine rather than a hosted visual editor and team workspace.
Mermaid AIThe free hosted plan stops at three diagrams, while collaborative editing sits behind paid tiers; that is a demo allowance, not a durable replacement.
Mermaid Live EditorA good text editor and preview, but it lacks Mermaid Chart's visual editing and collaborative workspace.
how to choose a Mermaid Chart alternative
Easiest to get running
Excalidraw — a one-click install, no server to maintain.
Most proven
Excalidraw, with 131,762 GitHub stars — the largest community of the 2, which usually means more answers when something breaks.
what you give up by leaving Mermaid Chart
- high-fidelity import and export
- presentation and enterprise controls
- multiplayer cursors and comments
- large template libraries
None of the picks above covers all of it. The full verdict says which gaps matter.
Mermaid Chart alternatives at a glance
| tool | license | running it | platforms | stars | active |
|---|---|---|---|---|---|
| Excalidraw | MIT | one-click install | self-hosted, web | 131,762 | 2026-09 |
| draw.io | Apache-2.0 | one-click install | self-hosted, web | 43,000 | 2026-09 |
why people still pay for Mermaid Chart
Mermaid Chart: The shapes are easy; customers pay for low-friction editing, reliable exports, collaboration, and a canvas that never fights them.
questions about switching from Mermaid Chart
Is there an open-source alternative to Mermaid Chart?
Yes: Excalidraw, draw.io. Every tool on this page is open source: no trials, no crippled tiers.
Can open source really replace Mermaid Chart?
Our verdict is YES. Excalidraw (132k stars), draw.io (43k stars) are mature open-source replacements for Mermaid Chart — self-host in one command and stop paying. The full verdict, and what you give up by switching, is at caniopensourceit.online/mermaid-chart.
What is the easiest open-source Mermaid Chart alternative to set up?
Excalidraw — a one-click install, no server to maintain.
What is the most popular open-source Mermaid Chart alternative?
By GitHub stars, Excalidraw (131,762). draw.io is next with 43,000.
