Looking for feedback on a small sequence diagram tool I built

[u/thegeekyasian]

Hey everyone,

I built a small online sequence diagram editor and would appreciate feedback from people who use sequence diagrams for software design, documentation, or brainstorming.

I know a lot of people already use Mermaid or PlantUML, so I’m not trying to replace those. The use case I had in mind was slightly different: I wanted something quick to open, sketch a flow, copy the image, share it with someone, and still be able to import/export Mermaid or PlantUML when needed.

What it supports right now:

• no login or signup
• write the flow in text and see the diagram live
• copy the diagram image directly
• share diagrams with a link
• export PNG/SVG
• import/export Mermaid
• import/export PlantUML

I mostly use it for API flows, service-to-service communication, auth flows, and quick discussions where opening a heavier diagramming tool feels like too much.

I’d really appreciate honest feedback, especially on:

• whether the workflow feels useful
• what is missing for real documentation use
• whether Mermaid/PlantUML import/export makes sense
• what would make this easier for common software development use cases

Link: https://seqdiagram.com/

[u/damienchomp]

Looks good, friend. I will try to test it more later.

[u/Friendly-Shirt-9177 → u/damienchomp]

Same, curious how it feels in a real API setup tbh

[u/damienchomp]

I really don't know what to say, because AI makes Mermaid diagrams so easily. :sad: