Markdy vs Mermaid: When to Animate Your Diagrams as Code

Mermaid popularized diagram-as-code — flowcharts and sequence diagrams from fenced code blocks in your README. It's great, widely supported, and the right tool for a static chart. Markdystarts from the same idea (declare a diagram in text, keep it in version control) but adds the thing Mermaid doesn't do: it animates the diagram, revealing nodes and tracing labeled flows over a timeline.

Side by side

The same idea, in each syntax

A request path in Mermaid is a static sequence:

sequenceDiagram
  Web->>API: GET /users
  API->>DB: query
  DB-->>API: rows
  API-->>Web: 200 OK

The same flow in Markdy is a scene that plays out beat by beat:

scene theme=paper
layout LR

browser Web
service API
database DB

beat main:
  show $nodes stagger=80ms
  Web -> API "GET /users" -> DB "query"
  Web <- API "200 OK"

When to use which

• Use Mermaid for a static flowchart, ER diagram, or Gantt chart embedded in docs — especially where Mermaid rendering is already built in (GitHub, GitLab, many wikis).
• Use Markdy when the sequence is the point: walking a reader through an architecture, a cache-miss fallback, a deploy pipeline, or an onboarding flow with motion and emphasis.

They're not mutually exclusive — many teams keep Mermaid for quick static charts and reach for Markdy on the hero diagram of a launch post or an architecture review.

Looking specifically for a Mermaid alternative?

If you're here because Mermaid feels too static, read the best Mermaid alternative for animated diagrams, or see how the authoring model works inanimated diagrams as code. You can also try the exact examples above in the playground.