SequenceDiagram.org
sequencediagram.org
Create UML sequence diagrams online with text or drag-and-drop
Alternative to nomnoml
ASCIIFlow
On this page: About · In their words · Where it fits · Compare · Information · Alternatives (2) · Related tools (4) · FAQ
About SequenceDiagram.org
SequenceDiagram.org is an online tool for creating UML sequence diagrams, founded in 2014. It combines text notation scripting with drag-and-drop drawing in a single model to improve efficiency. All processing and drawing occur client-side, making the tool fast and convenient, and it does not transfer data to servers. The tool is free and open-source, supporting multiple storage options like Google Drive, OneDrive, and web storage.
Published 2026-08-13 · Links checked 2026-09-09
SequenceDiagram.org in their own words
“Free sequence diagram online tool. Create sequence diagrams using textual notation or draw quickly via Drag and Drop with an easy to use interface.”
— official site (homepage description), checked
Where SequenceDiagram.org fits
SequenceDiagram.org is tagged #uml, #diagram, #sequence-diagram, #text-editor, #drag-drop. Each tag links to every listed tool that shares it.
- #uml — 2 listed tools share this tag, including nomnoml
- #diagram — 3 listed tools share this tag, including nomnoml, ASCIIFlow
- #sequence-diagram — the only listing with this tag so far
- #text-editor — the only listing with this tag so far
- #drag-drop — the only listing with this tag so far
SequenceDiagram.org is one of 77 Dev Tools listed on ToolDock. Also in Dev Tools: n8n, Replit, Exa — see the Dev Tools ranking (neutral, stable positions; no paid placement).
Compare SequenceDiagram.org with Dev Tools tools
Side-by-side pages use listing facts only: pricing, shared and unique tags, official-site facts where available, and verification dates.
| Tool | Pricing | Shared tags | Compare |
|---|---|---|---|
| Free | #uml #diagram | SequenceDiagram.org vs nomnoml → | |
| Free | #diagram | SequenceDiagram.org vs ASCIIFlow → |
SequenceDiagram.org alternatives & related Dev Tools
SequenceDiagram.org alternatives
Tools sharing tags with SequenceDiagram.org — each match reason is computed from real listing data.
Draw sassy UML diagrams from plain syntax
shares #uml #diagram · #text-to-diagram ≈ #sequence-diagram, #text-to-diagram ≈ #text-editor · also Dev Tools · both Free · nomnoml alternatives →
✓ Links checked Sep 2026View →
See the full list of SequenceDiagram.org alternatives →
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Frequently asked questions
What is SequenceDiagram.org?
SequenceDiagram.org is a Dev tool: Create UML sequence diagrams online with text or drag-and-drop. It is listed on ToolDock with a direct link to its official site.
Is SequenceDiagram.org free?
Yes — SequenceDiagram.org is listed as free on ToolDock. Pricing label set at listing time; official pricing page linked where verified — see the official website for current details.
What are the best SequenceDiagram.org alternatives?
Alternatives to SequenceDiagram.org listed on ToolDock (matched by shared tags and category) include nomnoml, ASCIIFlow. See the full list of SequenceDiagram.org alternatives.