PlantUML vs WebSequenceDiagrams (2026): which should you pick?
As of Nov 13, 2026, PlantUML grades higher than WebSequenceDiagrams: 3.0 against 2.4 out of 4.0.
Checked Nov 12, 2026 and Nov 13, 2026 · graded Nov 12, 2026 and Nov 13, 2026 by ToolGPA
PlantUML grades higher on value for money and the free plan. They get the same grade on features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
WebSequenceDiagrams
Text-to-diagram sequence diagram maker with its own layout engine
Which one is for you
Pick PlantUML if
- Fits if you want diagrams stored as text next to your code
- Works for teams documenting systems in wikis or Markdown
Look elsewhere if
- Skip it if you want to drag shapes around a canvas
- Not for you if you sketch freehand, because it has no whiteboard
- Watch out: layout is decided by the engine, so fine control over placement is limited
- Watch out: only the GPL build has every feature, and other license builds lack some such as ditaa
Pick WebSequenceDiagrams if
- Fits if you write sequence diagrams from text inside VS Code
- Works for a team of five or more that needs one block of Pro accounts
Look elsewhere if
- Skip it if you want freeform whiteboarding: it draws sequence diagrams only
- Tight if you stay free: wider diagrams and PDF or SVG export are Pro
- Pricey if you pay monthly: $15 against $10 billed annually
- Watch out: WSD Team is a block of 10 accounts at $699 a year, and Enterprise Server is $5,999 plus 20% yearly
How we grade them
| 3.0GPAPlantUMLVery good | 2.4GPAWebSequenceDiagramsFair | |
|---|---|---|
| Value for money | AFree and open source, with a jar anyone can download or an online editor. Nothing to pay, whatever the category's $5 to $10 a month. | CWSD Pro is $10 a month billed annually, $15 monthly, against $8.25 in the middle for whiteboard tools. WSD Team is $699 a year for a block of 10. |
| Free plan and trial | AThe whole tool is free, under GPL, LGPL, Apache, BSD, EPL or MIT licenses, so there's no cap to hit. | BWSD Basic is free and lets you save your work and see revision history. The edge is paid: wider diagrams, PDF and SVG export and no branding. |
| Features | CUML plus Gantt, mind maps and wireframes from text. But the FAQ admits you get less say over layout, there's no visual canvas, and non-GPL builds lose some features like ditaa. | CDoes sequence diagrams fully, plus HAR file analysis and a self-hosted edition. A smaller job than a whiteboard, and branding stays on until you pay. |
| Ease of use | CYou have to learn its text language before you get a diagram, and no store rating is on record. The in-browser editor takes some of the sting out. | CNo store rating on record. You learn a text syntax before the first diagram. |
| Platforms and integrations | BRuns in a browser and through a jar, with links into Confluence, MediaWiki, IntelliJ IDEA, Eclipse and GitHub. No phone app or desktop app of its own is listed. | BWeb, with a VS Code extension and AI access via Claude and GitHub Copilot. No phone app. |
| Best for | text-described UML and other diagrams | sequence diagrams written as text |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: PlantUML and WebSequenceDiagrams. How we grade
Price against what you get
PlantUML has no paid plan and scores 2.3 out of 4 on features, ease of use and platforms. WebSequenceDiagrams starts at $10 a month and scores 2.3.
They score the same, and PlantUML starts $10 a month lower. Of the other whiteboard and mind map tools on the chart, none scores higher than PlantUML for less, and 22 score higher than WebSequenceDiagrams for less.
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
Where they differ
- PlantUML is open source, according to its own site.
- WebSequenceDiagrams is self-hostable, according to its own site.
- PlantUML also covers Gantt & timelines and mind mapping.
At a glance
| PlantUML | WebSequenceDiagrams | |
|---|---|---|
| Pricing | Free | Free plan |
| Starts at | Free | $10 per month, billed annually ($15 billed monthly) |
| Free plan | Free of charge and open source, under several license options including GPL, LGPL, Apache, BSD, EPL and MIT. | WSD Basic: save your work, wider diagrams, revision history and PDF and SVG export. |
| Free trial | None listed | None listed |
| Web | ||
| Browser extension | ||
| Made by | PlantUML | Hanov Solutions Inc. |
| Price read from | plantuml.com | websequencediagrams.com |
| Checked | Nov 12, 2026 | Nov 13, 2026 |
Worth knowing
PlantUML
- Layout is controlled by the engine; the FAQ says it gives less control over placement than drag-and-drop tools.
- Diagrams are written in code, so there is no visual canvas for freehand sketching.
- Builds under licenses other than GPL lack some features, such as the ditaa integration.
WebSequenceDiagrams
- It makes sequence diagrams only; it is not a freeform whiteboard.
- Branding is removed only on paid plans.
- The Team plan is sold as a block of 10 accounts, so it suits five or more users.
- Enterprise Server is quoted as a site license with 20% yearly maintenance and is sold through sales.
Key features
PlantUML
- Text-to-diagram language
- Diagrams are written as short text and drawn from it, so changing the text updates the picture.
- UML and non-UML diagrams
- Supports sequence, use case, class, object, activity, component, deployment, state and timing diagrams, plus Gantt, MindMap, WBS, wireframe and others.
- In-browser editor
- The home page has an editor that runs in the browser with a JavaScript rendering engine and redraws as the code changes.
- Many integrations
- The Running page lists connections to wikis and forums, editors and IDEs, including Confluence, MediaWiki, IntelliJ IDEA and Eclipse.
- Several license options
- The download page offers jars under GPL, LGPL, Apache, BSD, EPL and MIT; the GPL build is the one with every feature, such as ditaa.
WebSequenceDiagrams
- Text-based diagrams
- Diagrams are written as text and the engine lays out actors and messages without manual line routing.
- VS Code extension
- An official extension offers live side-by-side preview, syntax highlighting and snippets inside the editor.
- AI through MCP
- Claude, GitHub Copilot or other MCP-compatible assistants can generate diagram syntax that the engine then lays out.
- HAR file analysis
- HTTP Archive files can be converted into sequence diagrams that map cross-origin requests and API calls.
- Self-hosted edition
- The Enterprise Server edition runs on a company's own infrastructure so diagrams stay on the internal network.
Plans
PlantUML
Open source$0
Free jar and source code under your choice of license; you run it yourself or use the online editor.
WebSequenceDiagrams
WSD Basic$0
Save your work, wider diagrams, revision history and high quality PDF and SVG export.
WSD Pro$10
per month, billed annually ($120 a year; $15 billed monthly)
Removes WSD branding; adds auto-save, parallel flows, auto-numbering and multipage PDF export.
WSD Team$699
per year for a block of 10 Pro accounts
All Pro features for 10 users, with centralized billing and priority email support.
Enterprise Server Edition$5,999
site license, plus 20% annual maintenance
Hosted on your own infrastructure for air-gapped use, with unlimited internal users; sold through sales.
Ways to pay less
PlantUML
No public discounts listed.
WebSequenceDiagrams
- Annual discount
Save 33% with annual billing
WSD Pro is $10 a month billed as $120 a year, against $15 a month on monthly billing; the pricing toggle labels the annual option as 33% off.
Common questions
Which is cheaper, PlantUML or WebSequenceDiagrams?
As of Nov 13, 2026, PlantUML is cheaper to start with: it is free, against $10 a month for WebSequenceDiagrams. PlantUML is free, and WebSequenceDiagrams starts at $10 per month, billed annually ($15 billed monthly).
Which has a free plan, PlantUML or WebSequenceDiagrams?
As of Nov 13, 2026, both PlantUML and WebSequenceDiagrams have a free plan.
Which platforms do PlantUML and WebSequenceDiagrams run on?
As of Nov 13, 2026, only PlantUML lists a browser extension. Both list a web app. A platform missing from a listing is one its maker's pages did not mention.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.