SequenceDiagram.org review (2026): is it any good?
Text-based UML sequence diagrams you can also drag and drop
SequenceDiagram.org report card
Very good · out of 4.0 · graded Nov 13, 2026
Best for UML sequence diagrams from text or drag and drop
SequenceDiagram.org is a free web editor for sequence and architecture diagrams, and you can type the diagram or drag it. It does nothing else, it has no live multi-user editing, and the code is not open source.
Who SequenceDiagram.org is for
- Fits if you draw sequence diagrams and want them stored in your own Drive
- Works for people who want diagrams processed in the browser, not on a server
Who SequenceDiagram.org is not for
- Skip it if you want a freeform whiteboard: sequence and architecture diagrams only
- Not for you if you need live co-editing, because sharing is by link or saved file
- Watch out: the code is not open source, and the paid on-prem Docker version has no published price
- Too light for team spaces: there are no accounts or shared workspaces listed
Why SequenceDiagram.org gets a 3.0
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- AValue for moneyFree to use, with a Patreon at $1 a month for donations. Nothing on the page is paid for features.
- AFree plan and trialFree outright, with no plan, trial or sign-up needed. Work saves to the browser, a file, Google Drive or OneDrive.
- CFeaturesSequence and architecture diagrams with export and plugins. A smaller job than a whiteboard, and the listing says it covers nothing else.
- CEase of useNo store rating on record. You get a text syntax and a drag-and-drop view to learn.
- BPlatforms and integrationsWeb with Google Drive, OneDrive, Confluence and IntelliJ IDEA integrations. No desktop or phone app.
What these grades rest on. Graded from this listing, whose facts were read from SequenceDiagram.org's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. How we review and grade.
Make SequenceDiagram.org? Put this grade on your site
Paste this where you want the badge. It links here and follows the grade if it changes. About badges
<a href="https://toolgpa.com/tools/sequencediagram-org#review"><img src="https://toolgpa.com/badge/sequencediagram-org.svg" alt="SequenceDiagram.org: 3.0 GPA on ToolGPA" width="196" height="56"></a>Where SequenceDiagram.org stands among whiteboard and mind map tools
SequenceDiagram.org's GPA of 3.0 is higher than 85 of the 98 other whiteboard and mind map tools we grade, and level with 10.
It stands best on free plan and trial (A, above 83 of 98) and worst on features (C, above 0).
SequenceDiagram.org has no paid plan.
On features, ease of use and platforms it scores 2.3 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price.
Each grade against the category
Every bar is all 99 whiteboard and mind map tools we grade, cut by the letter each got. SequenceDiagram.org’s own letter is outlined.
- AValue for moneyAbove 74 of 98, level with 24
- AFree plan and trialAbove 83 of 98, level with 15
- CFeaturesAbove 0 of 98, level with 76
- CEase of useAbove 1 of 98, level with 77
- BPlatforms and integrationsAbove 35 of 98, level with 55
Price against what you get
Each dot is one of 88 whiteboard and mind map tools. Further left costs less, and higher up scores better on features, ease of use and platforms. Point at a dot to see which tool it is.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Keep SequenceDiagram.org, or make your own?
Keep it
SequenceDiagram.org is free, so making your own would save you nothing.
And it is not the kind of software a weekend replaces. It is one of the better ones too: its GPA of 3.0 is higher than 85 of the 98 other whiteboard and mind map tools we grade.
What you could not
- A diagram editor.
- It plugs into other products, Google Drive, OneDrive and Confluence among them, and has an API.
What this rests on. SequenceDiagram.org’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
What is SequenceDiagram.org?
SequenceDiagram.org is an online editor for UML sequence diagrams that combines a text notation with drawing by clicking and dragging in the same model. Parsing and drawing run in the browser, so diagram data is not sent over the internet, and diagrams can be saved to local files or cloud drives.
Worth knowing
- It covers sequence and architecture diagrams only, not freeform whiteboarding.
- The code is not available under an open-source license.
- There is no real-time multi-user editing; sharing is by link or saved file.
- The on-prem Docker version is a paid perpetual license, but its price is not published.
Key features
- Text and drag-and-drop together
- A diagram is described in a text script and can also be edited by clicking and dragging on the drawing.
- Client-side processing
- All parsing, processing and drawing happens in the browser, which the site says means diagram data is not transferred over the internet.
- Saving and sharing
- Diagrams save to a file, Google Drive, OneDrive or browser storage, and a share link can be generated.
- Export
- Export as SVG with the source text embedded, or as PNG; PDF is produced by printing from the browser.
- Architecture diagrams
- Besides sequence diagrams the editor can create architecture diagrams, which need a recent Chrome, Edge, Firefox or Safari.
- Plugins and on-prem
- Plugins exist for Confluence Cloud and IntelliJ IDEA, and a Docker image is offered for internal company use.
SequenceDiagram.org pricing
As of Nov 13, 2026, SequenceDiagram.org is free to use.
- Starts at
- Free
- Free plan
- None
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| Web app | $0 | The browser editor is free to use; the site invites voluntary Patreon support from $1 a month. |
Read from sequencediagram.org on Nov 13, 2026. Prices change, so confirm with SequenceDiagram.org before you buy.
Works with
- Google Drive
- OneDrive
- Confluence
- IntelliJ IDEA
SequenceDiagram.org alternatives
- SequenceDiagram.org vs WebSequenceDiagrams
Free plan · from $10/mo
- SequenceDiagram.org vs Mermaid
Free plan · from $10/mo
Common questions
Does SequenceDiagram.org have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. SequenceDiagram.org is listed for Web.
Does SequenceDiagram.org have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. SequenceDiagram.org is listed for Web.
Is SequenceDiagram.org open source?
SequenceDiagram.org is not described as open source on its own site, as read on Nov 13, 2026.
Does SequenceDiagram.org work offline?
Yes, according to its own site. What works without a connection differs by plan and platform, so check the vendor's page for the detail.
Does SequenceDiagram.org have an API?
Yes. SequenceDiagram.org offers a public API, according to its own site.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Nov 13, 2026.