nomnoml review (2026): is it any good?
Text-to-UML diagram editor with a live preview
nomnoml report card
Good · out of 4.0 · graded Nov 13, 2026
Best for UML diagrams drawn from a text syntax
Nomnoml draws UML-style diagrams from text, and it costs nothing. The web app has no accounts, sharing or collaboration, saving depends on browser storage the author does not guarantee, and there is no canvas to draw on.
Who nomnoml is for
- Fits if you want a class or flow diagram out of a few lines of text
- Works for developers who embed diagrams through the library or command line
Who nomnoml is not for
- Skip it if you want a freehand canvas or sticky-note board
- Watch out: saving relies on browser localStorage, which the author says comes with no guarantees
- Not for you if you need accounts, sharing links or real-time editing, as the web app has none
- Too light for teams: no collaboration of any kind is listed
Why nomnoml gets a 2.8
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- AValue for moneyFree, open source and available as a library and a command line tool as well as the web app.
- AFree plan and trialFree outright, with no sign-up, cap or paid plan.
- CFeaturesClass, component and flow diagrams from text, with styling. It does that fully, but it is a smaller job than a whiteboard, with no freehand canvas or sticky notes.
- CEase of useNo store rating on record. You learn its text syntax first.
- CPlatforms and integrationsWeb only for most people, plus a library and command line. No integrations are listed.
What these grades rest on. Graded from this listing, whose facts were read from nomnoml's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. How we review and grade.
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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/nomnoml#review"><img src="https://toolgpa.com/badge/nomnoml.svg" alt="nomnoml: 2.8 GPA on ToolGPA" width="196" height="56"></a>Where nomnoml stands among whiteboard and mind map tools
nomnoml's GPA of 2.8 is higher than 75 of the 98 other whiteboard and mind map tools we grade, and level with 9.
It stands best on free plan and trial (A, above 83 of 98) and worst on features (C, above 0).
nomnoml has no paid plan.
On features, ease of use and platforms it scores 2.0 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. nomnoml’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
- CPlatforms and integrationsAbove 0 of 98, level with 34
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 nomnoml, or make your own?
Keep it
nomnoml is free, so making your own would save you nothing.
It is one of the better ones too: its GPA of 2.8 is higher than 75 of the 98 other whiteboard and mind map tools we grade.
What you could not
- A diagram editor.
What this rests on. nomnoml’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 nomnoml?
nomnoml draws UML diagrams from a short text syntax. You type code on one side of the page and the diagram redraws beside it, covering class, component, flow chart and use case shapes. It is a free, open-source web editor that also ships as a JavaScript library and command-line tool.
Worth knowing
- It draws diagrams from code only; there is no freehand canvas or sticky-note board.
- Saving relies on browser localStorage, which the author says comes with no guarantees.
- The web app has no accounts, sharing or real-time collaboration.
Key features
- Text syntax with live preview
- Edit the code on the left and the diagram on the right updates as you type, with keyboard shortcuts borrowed from Sublime Text.
- Several UML shape families
- Built-in classifier types cover classes, abstract classes, packages, components, sockets, actors, use cases, states, choices, databases and tables.
- Styling directives
- Directives such as #direction, #fill, #font and #spacing change layout and appearance, and custom classifier styles can be defined and imported from other files.
- Library and command line
- The nomnoml npm package renders diagrams on a web page or to SVG in Node, and npx nomnoml converts a file from the command line.
- Browser-only storage
- The web app is client-side and keeps your diagram in the browser's localStorage, so it is there on your next visit, though the author gives no guarantee.
nomnoml pricing
As of Nov 13, 2026, nomnoml is free to use.
- Starts at
- Free
- Free plan
- None
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| Free | $0 | The whole editor, the npm library and the command-line renderer are free under the MIT license. |
Read from nomnoml.com on Nov 13, 2026. Prices change, so confirm with nomnoml before you buy.
nomnoml alternatives
- nomnoml vs Mermaid
Free plan · from $10/mo
- nomnoml vs Flowchart Fun
Free plan · from $2/mo
Common questions
Does nomnoml have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. nomnoml is listed for Web.
Does nomnoml have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. nomnoml is listed for Web.
Is nomnoml open source?
Yes. nomnoml is open source, 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.