Sequence Diagram Generator

Generate sequence diagrams from natural language or code. Visualize system interactions, API flows, and software architecture instantly.

Why choose our Sequence Diagram Generator?

Natural language sequence diagram generation

Natural Language to Diagram

Describe your system interaction in plain English: 'User clicks login, frontend calls auth API, API validates with database, returns JWT token.' AI converts it to a professional sequence diagram.

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Code to sequence diagram conversion

Code-Aware Generation

Paste your code and let AI trace the execution flow. Automatically identify function calls, API requests, database queries, and async operations to generate accurate diagrams.

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Multiple export format options

Developer-Friendly Exports

Export as Mermaid markdown for docs, PlantUML for wikis, SVG for presentations, or PNG for quick sharing. Keep diagrams in version control alongside your code.

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Who is it for?

👩‍💻

For Software Developers

Document API interactions, debug async flows, and communicate system design without spending hours in diagramming tools.

🏗️

For System Architects

Quickly visualize complex microservice interactions, event-driven architectures, and integration patterns.

📚

For Technical Writers

Create clear, accurate sequence diagrams for API documentation, user guides, and technical specifications.

AI Diagrams vs Manual Diagramming

Manual Tools

Flowith AI

Input Method

Drag and drop boxes manually, tedious alignment.

Describe in natural language or paste code - AI generates the diagram.

Code Integration

No connection to actual codebase.

Analyzes code to auto-generate accurate sequence flows.

Updates

Rebuild from scratch when requirements change.

Edit text description and regenerate instantly.

Export Options

Limited to proprietary formats.

Export to SVG, PNG, Mermaid, PlantUML, and more.

How to create a sequence diagram in 3 steps?

1

Describe or Paste Code

Write a natural language description of your system flow or paste the relevant code snippet.

2

Review & Refine

AI generates the sequence diagram. Edit participants, messages, or add notes to perfect it.

3

Export & Document

Download in your preferred format. Embed in documentation, wikis, or presentations.

Frequently Asked Questions

Yes, you can create sequence diagrams for free with Flowith. Generate professional diagrams from descriptions or code and export in multiple formats.
We support standard UML sequence diagram notation including synchronous/asynchronous messages, self-calls, loops, alt/opt/break fragments, and participant lifelines.
Yes! Paste JavaScript, TypeScript, Python, Java, or other common languages. AI analyzes function calls and interactions to generate accurate diagrams.
Export as SVG (scalable vector), PNG (images), Mermaid (for GitHub/Notion), PlantUML (for wikis), or raw text for manual editing.
Absolutely. Modify the text-based diagram code, add notes, rename participants, adjust message labels, and regenerate as needed.

Start generating diagrams today

Document your systems faster with AI-powered diagramming.

Generate sequence diagram