Swimlanes – A web app for creating sequence diagrams with Markdown

In plain words

Swimlanes is a free web tool for creating sequence diagrams using Markdown-style text. Users edit text on the left side while the diagram updates in real time on the right. The tool allows diagrams to be downloaded as images or shared via URL. Users can also sign in to save multiple diagrams to an account. It's designed for anyone needing to visualize interactions and processes between different actors or systems.

written from the facts on this page · September 2026

From the sources

Swimlanes.io is a free webapp for making sequence diagrams. You simply edit the text on the left and the diagram is updated in real time. You can download your sequence diagrams as images or distribute with a link. title: Welcome to swimlanes.io One -> Two: Message note: **swimlanes.io** is a simple online tool for creating _sequence diagrams_. Edit the text to the left to update the diagram. **Copy the url** to save or share the diagram, _note that the url changes whenever you update the diagram_. Or `Sign in {fa-sign-in-alt}` to create an account and collect all of your diagrams. Two -> Two: To self Two -->> Three: _Notification_ Two -> One: `ok` note: See **[full…from swimlanes.io

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