PlantUML vs Swimlanes.io (2026): which should you pick?
As of Nov 13, 2026, PlantUML grades higher than Swimlanes.io: 3.0 against 2.8 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 platforms. They get the same grade on value for money, the free plan, features and ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
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 Swimlanes.io if
- Fits if you write a sequence diagram a week and want it from text
- Works for explaining an API call or a login flow to someone with a link
Look elsewhere if
- Skip it if you want a freeform canvas or sticky notes: it draws sequence diagrams only
- Watch out: without an account the web address changes on every edit, so an old link shows the old diagram
- Not for you if your company needs a named vendor and published terms, because the site gives neither
- Too light for teams: no real-time collaboration is listed
How we grade them
| 3.0GPAPlantUMLVery good | 2.8GPASwimlanes.ioGood | |
|---|---|---|
| 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. | AFree, with no paid plan listed. It is a web app anyone can open and use, which beats every price in the category. |
| 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. | AFree outright: no plan, cap or trial on the page. An account is optional and only collects your diagrams. |
| 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, with flow structures, Markdown, sharing and export. That is a smaller job than a whiteboard, with no freeform canvas. |
| 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 write the diagram in a text syntax, so there is a short learning curve. |
| 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. | CWeb only. Sign-in goes through Google or GitHub, and no apps or integrations are listed. |
| Best for | text-described UML and other diagrams | quick sequence diagrams in the browser |
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 Swimlanes.io. 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. Swimlanes.io has no paid plan and scores 2.0.
PlantUML scores higher for the same starting price. Of the other whiteboard and mind map tools on the chart, none scores higher than PlantUML for less, and none scores higher than Swimlanes.io 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.
- PlantUML also covers Gantt & timelines and mind mapping.
- Swimlanes.io also covers Markdown and file sharing.
In commonFree planWebDiagrams
At a glance
| PlantUML | Swimlanes.io | |
|---|---|---|
| Pricing | Free | Free |
| Starts at | Free | Free |
| Free plan | Free of charge and open source, under several license options including GPL, LGPL, Apache, BSD, EPL and MIT. | None |
| Free trial | None listed | None listed |
| Web | ||
| Browser extension | ||
| Made by | PlantUML | Swimlanes.io |
| Price read from | plantuml.com | swimlanes.io |
| 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.
Swimlanes.io
- Without an account, the diagram lives in the URL and the URL changes whenever the diagram is edited.
- It draws sequence diagrams only, with no freeform canvas.
- The site does not name the company behind it or publish terms or a pricing page that we could read.
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.
Swimlanes.io
- Live text editing
- Edit the text on the left and the sequence diagram on the right updates in real time.
- Markdown in messages and notes
- Messages and notes accept italic, bold, strike-through and inline code, plus lists, links, code blocks and Font Awesome icons.
- Flow structures
- The syntax covers conditional sections with if and else, groups, dividers, delays, automatic numbering and actor reordering.
- Sharing and export
- Diagrams can be shared as a link, short URL, image link or embed, or downloaded as an image or PDF.
- Optional account
- Signing in with Google or GitHub collects a person's diagrams in one place; without it the URL carries the diagram.
Plans
PlantUML
Open source$0
Free jar and source code under your choice of license; you run it yourself or use the online editor.
Swimlanes.io
Free$0
The site describes itself as a free web app; no paid plan is listed.
Common questions
Which is cheaper, PlantUML or Swimlanes.io?
As of Nov 13, 2026, both PlantUML and Swimlanes.io are free to use.
Which has a free plan, PlantUML or Swimlanes.io?
As of Nov 13, 2026, both PlantUML and Swimlanes.io have a free plan.
Which platforms do PlantUML and Swimlanes.io 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.