Alternatives to Mermaid, mostly about layout.
Almost everyone leaving Mermaid is leaving because of how the diagram looks, not what it can express.
Mermaid's decisive advantage is that it renders natively in a GitHub README with no build step and no committed image, which is why it spread faster than anything else in its category. Its decisive weakness is layout: on anything past a moderate graph the result needs coaxing, and the coaxing is unportable. D2 was designed later with layout quality as an explicit goal and offers three engines. PlantUML covers far more diagram types. Graphviz is the layout engine much of the field is built on. Generated tools skip the language entirely.
If layout is the problem
D2 is the direct answer: open source, an offline CLI with a watch mode, exports to SVG, PNG and PDF, and a choice among three layout engines because layout was treated as the hard part rather than a detail. Graphviz is the older and lower-level option, and much of what other tools do is Graphviz underneath. Both cost you Mermaid's native GitHub rendering, so you commit an image.
If you need diagram types Mermaid lacks
PlantUML has the widest coverage in this category, including the full range of UML plus a well-used C4 macro library, and needs Java or a hosted server to render. If your requirement is a specific formal diagram type, PlantUML almost certainly has it and Mermaid may not.
If you want to stop writing diagrams
Every option above still has you author the diagram. Tools that read the repository do not: CodeViz in VS Code, GitDiagram for a public GitHub URL, Lucid Train as a desktop app whose agent emits a semantic graph that a constraint solver lays out, so overlaps cannot occur and the diagram can become a coding specification.
One thing to check before you move
Mermaid Chart, the commercial product built around Mermaid, now redirects to mermaid.ai and its old domain serves a robots file disallowing crawling with a note that the content has moved. If you are evaluating the hosted product rather than the open-source renderer, make sure you are looking at the current site.
Where Lucid Train sits
Lucid Train is one of the options below rather than the conclusion. It is a desktop application that generates architecture diagrams from a codebase and hands them to a coding agent, it has no browser version, no real-time collaboration and no share links, and for several of the needs on this page it is the wrong answer.
When this was checked
Facts here were checked against each vendor's own site on 22 August 2026. Pricing and features change without notice, so verify anything you are about to decide on.
By reason for leaving
| You want | Look at |
|---|---|
| Better layout, same idea | D2, Graphviz |
| More diagram types | PlantUML |
| Native GitHub rendering | Stay on Mermaid |
| No authoring at all | CodeViz, GitDiagram, Lucid Train |
Questions
Related
- Miro Alternatives for Software ArchitectureMiro is a workshop tool. Most people looking for an alternative want the diagram to mean something afterwards.
- Claude Code AlternativesTwo different questions get asked as one: which agent, and what runs around it.
- draw.io AlternativesThe right replacement depends entirely on which of draw.io's properties you are trying to escape.
- Eraser AlternativesEraser's bet is diagram-as-code with a visual editor on top. The alternatives all disagree about a different part of that.
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