The SequenceDiagram.org Insider’s Guide
Everything we know about SequenceDiagram.org in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
SequenceDiagram.org
The Insider’s Guide
Text-based UML sequence diagrams you can also drag and drop
Every plan, grade, refund rule and rival among whiteboard and mind map tools, read from SequenceDiagram.org’s own pages.
Made by NoSpareTime AB · checked Nov 13, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from SequenceDiagram.org’s own pages, its app-store listings and our grades. Every fact in it is on SequenceDiagram.org’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
3.0
GPA, above 85 of the 98 other whiteboard and mind map tools we grade
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.
To get you started, here are 8 things to know about SequenceDiagram.org, taken from its own pages and our grades.
It does nothing else, it has no live multi-user editing, and the code is not open source.
- 1
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.
- 2
It is free
SequenceDiagram.org has no paid plan at all.
- 3
It runs on Web
Web.
- 4
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.
- 5
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.
- 6
Saving and sharing
Diagrams save to a file, Google Drive, OneDrive or browser storage, and a share link can be generated.
- 7
A 3.0 GPA, above 85 of 98
That is against the other whiteboard and mind map tools we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
SequenceDiagram.org is free, so making your own would save you nothing.
SequenceDiagram.org at a glance
- Pricing
- Free
- Free plan
- It is free
- Free trial
- None stated
- Runs on
- Web
- Made by
- NoSpareTime AB, since 2014
- Category
- Whiteboards & Mind Maps
- Our grade
- 3.0 GPA, very good
The report card
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.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | Free to use, with a Patreon at $1 a month for donations. Nothing on the page is paid for features. |
| Free plan and trial | A | Free outright, with no plan, trial or sign-up needed. Work saves to the browser, a file, Google Drive or OneDrive. |
| Features | C | Sequence and architecture diagrams with export and plugins. A smaller job than a whiteboard, and the listing says it covers nothing else. |
| Ease of use | C | No store rating on record. You get a text syntax and a drag-and-drop view to learn. |
| Platforms and integrations | B | Web with Google Drive, OneDrive, Confluence and IntelliJ IDEA integrations. No desktop or phone app. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
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 it 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
Good to know
Good for
- Engineers who write sequence diagrams as text
- Teams that cannot send diagram data to an outside server
- Confluence and IntelliJ users who want diagrams inside those tools
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.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
Free
No paid plan at all
SequenceDiagram.org is free to use.
Nothing on the page is paid for features.
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.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Text-based UML sequence diagrams you can also drag and drop. Here is what it does, as its own site describes it, and what it covers: works offline, public API, diagrams.
Sequence and architecture diagrams with export and plugins.
- 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.
Where it runs
- Web
What it works with
- Google Drive
- OneDrive
- Confluence
- IntelliJ IDEA
SequenceDiagram.org is made by NoSpareTime AB, and has been around since 2014.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
85/98
Other whiteboard and mind map tools it is graded above
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
- AFree plan and trialAbove 83 of 98
- CFeaturesAbove 0 of 98
- CEase of useAbove 1 of 98
- BPlatforms and integrationsAbove 35 of 98
Price against what you get
Each dot is one of 88 whiteboard and mind map tools. Further left costs less; higher up scores better on features, ease of use and platforms. SequenceDiagram.org is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
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.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
WebSequenceDiagrams, Swimlanes.io, PlantUML, Mermaid and nomnoml
The 5 tools SequenceDiagram.org is most often weighed against, with where each one differs from it.
- 2.4GPA
WebSequenceDiagrams
Free plan · from $10/mo
Text-to-diagram sequence diagram maker with its own layout engine.
- WebSequenceDiagrams is self-hostable, according to its own site.
- 2.8GPA
Swimlanes.io
Free
Free text-driven sequence diagram maker that updates live.
- Swimlanes.io also covers Markdown and file sharing.
- 3.0GPA
PlantUML
Free
Draw UML and other diagrams from plain-text descriptions.
- Only PlantUML lists a browser extension.
- PlantUML is open source, according to its own site.
- PlantUML also covers Gantt & timelines and mind mapping.
- 2.4GPA
Mermaid
Free plan · from $10/mo
Text-based diagramming platform with AI and a visual editor.
- Mermaid also covers presentations.
- 2.8GPA
nomnoml
Free
Text-to-UML diagram editor with a live preview.
- nomnoml is open source, according to its own site.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
14
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is SequenceDiagram.org free?
Yes. SequenceDiagram.org is free to use.
How much does SequenceDiagram.org cost?
SequenceDiagram.org lists one plan. Web app: $0.
What platforms does SequenceDiagram.org work on?
SequenceDiagram.org is available on Web.
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.
What does SequenceDiagram.org integrate with?
SequenceDiagram.org's listing names Google Drive, OneDrive, Confluence and IntelliJ IDEA.
Who makes SequenceDiagram.org?
SequenceDiagram.org is made by NoSpareTime AB. It dates from 2014.
What are the alternatives to SequenceDiagram.org?
The closest alternatives to SequenceDiagram.org in our directory are WebSequenceDiagrams, Swimlanes.io, PlantUML, Mermaid and nomnoml.
How does SequenceDiagram.org compare with other 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.
Is SequenceDiagram.org good value for money?
ToolGPA grades SequenceDiagram.org A for value for money. SequenceDiagram.org has no paid plan.
Could I make my own version of SequenceDiagram.org?
SequenceDiagram.org is free, so making your own would save you nothing.
Where this guide comes from
The prices, plans, platforms and features were read from SequenceDiagram.org’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. 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.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by NoSpareTime AB. Prices change, so check sequencediagram.org before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- SequenceDiagram.org, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/sequencediagram-org
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "SequenceDiagram.org: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/sequencediagram-org
Know someone choosing between whiteboard and mind map tools?
Send them this guide: toolgpa.com/tools/sequencediagram-org/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded whiteboard and mind map tools after SequenceDiagram.org, each with an Insider's Guide of its own.
- Whiteboards & Mind Maps Insider's GuideEvery one of the 99 whiteboard and mind map tools we grade, compared
- Microsoft Whiteboard Insider's GuideFree collaborative canvas built into Microsoft 365 and Teams3.4 GPA
- draw.io Insider's GuideFree diagram editor that saves files to storage you choose3.2 GPA
- tldraw Insider's GuideFree online whiteboard with a local desktop app3.2 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what SequenceDiagram.org’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. SequenceDiagram.org is a trademark of its owner, and this guide is not made, paid for or approved by NoSpareTime AB. Prices and plans change: check sequencediagram.org before you buy.