UMLet - UML Tool for Fast UML Diagrams

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2023-03 (4.27), 2022-12 (4.26), 2022-09 (4.25), 2022-06 (4.24), 2022-03 (4.23), 2021-12 (4.22), 2021-09 (4.21), 2021-06 (4.20), 2021-03 (4.19), 2020-12 (4.18), 2020-09 (4.17), 2020-06 (4.16), 2020-03 (4.15), 2019-12 (4.14), 2019-09 (4.13), 2019-06 (4.12), 2019-03 (4.11), 2018-12 (4.10), 2018-09 (4.9), Photon (4.8), Oxygen (4.7), Neon (4.6), Mars (4.5), 2023-06 (4.28), 2023-09 (4.29), 2023-12 (4.30), 2024-03 (4.31), 2024-06 (4.32)

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Solution Description

The free UML tool UMLet lets you draw UML diagrams with a light-weight, pop-up-free user interface. It lets you draw diagram sketches fast; export diagrams to pdf, eps, jpg, gif, svg, bmp, png, and system clipboard; share diagrams using Eclipse 3+; and create your own custom graphical elements.

Additional Details

Eclipse Versions: 2023-03 (4.27), 2022-12 (4.26), 2022-09 (4.25), 2022-06 (4.24), 2022-03 (4.23), 2021-12 (4.22), 2021-09 (4.21), 2021-06 (4.20), 2021-03 (4.19), 2020-12 (4.18), 2020-09 (4.17), 2020-06 (4.16), 2020-03 (4.15), 2019-12 (4.14), 2019-09 (4.13), 2019-06 (4.12), 2019-03 (4.11), 2018-12 (4.10), 2018-09 (4.9), Photon (4.8), Oxygen (4.7), Neon (4.6), Mars (4.5), 2023-06 (4.28), 2023-09 (4.29), 2023-12 (4.30), 2024-03 (4.31), 2024-06 (4.32)

Platform Support: Windows, Mac, Linux/GTK

Organization Name: The UMLet Team

Development Status: Production/Stable

Date Created: Saturday, November 5, 2005 - 23:50

License: GPL

Date Updated: Friday, October 6, 2023 - 10:50

Submitted by: UMLet Team

Date Ranking Installs Clickthroughs
July 2024 45/603 293 7
June 2024 48/681 782 25
May 2024 37/682 1104 38
April 2024 41/687 1093 28
March 2024 50/694 877 28
February 2024 49/687 730 17
January 2024 50/691 814 29
December 2023 33/671 1200 30
November 2023 36/686 1251 36
October 2023 34/673 1471 45
September 2023 49/663 900 27
August 2023 60/673 643 21
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Unsuccessful Installs

Unsuccessful Installs in the last 7 Days: 6

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Reviews Add new review

Instantly works. Very good for rapidly drawing ideas.
I use it regularly for producing documentation with UML diagrams inside.
In order to avoid multiple rastering defects in drawings, I use the SVG export and automatically transform the .svg files to .odg (OpenOffice Drawing and Graphics) by svg2office-1.2.2.jar.
The result looks very clean.
For manual high quality export the diagram as EPS, insert it into OpenOffice by Insert > Image > From File...
Inside OpenOffice it looks not yet good, as this uses only the EPS preview.
Then print the document to a PDF printer (Do not use export!) and you will have the diagram in high-quality vector graphics in the PDF.

This is the best way to quickly sketch out diagrams! By focusing on the content the tool lets to experiment quickly and does not slow down the thinking. Other tools do not come close (well maybe SDEEdit for sequence diagrams).

I love custom elements feature too, very powerful!

A good alternative for dia. Especially with the support for properties of the elements.
A little awkward to use, but you get used to that quickly.

But could do much better if it had (I tested version 12.2):
- working z-order (automagical isn't working good - copied object is behind original object - who would want that?)
z-order context menu would be good
- display which element-type i'm working (may be even with support to change)
- fields for different properties
- transparency

Without correct z-ordering my diagrams look ugly.

In reply to by Simon Rohlwing

There is z-order support via the "layer=1,-1,2,-2.." command, but a bit tricky to find; v13 will have context-sensitive help in the panel, and maybe element context menu entries for layering. v13 will also allow more transparent element type handling, including on-the-fly changes between similar elements. "fields for different properties" (if I understand correctly) are unlikely to come; we prefer the single text panel approach to pop-ups, separate fields, and any other interface elements that restrict free text flow and UMLet's copy/paste logic (if I interpret this point wrong, let know). Finally, all elements are transparent by default; we might look into opacity in the future.

I'm not sure why anyone would download this after seeing the developer's website. The sole purpose of the site looks to be tricking people into accidentally clicking on one of the many sketchy camouflaged advertisements.

In reply to by Steven Edmunds

Our Web site's design could indeed be improved; it's just more fun to work on UMLet than on HTML (btw, v13 will probably be out in a few weeks). We use Google ads, and try to manually block the more aggressive ads (eg, those with large download buttons) that started to appear in the ad rotations in the last 12-18 months. (It's a bit tricky, as everyone might see different ads.)

Even though this tool does not promise to generate your application by creating a simple diagram, at least, it works! You can create UML diagrams in very little time.

There are many free UML tools out there many of them don't even work. This tool does. Great free tool for putting together a quick diagram to include in your design docs. The hardest part is figuring out how to download the plugin. It would be great to have an install link right on the Eclipse Market Place. I get the fact that they are trying to make some money to support the project by putting links to SPAM ware on their site but it would be nice if they were a little clearer about what you are downloading when you click on one of the large Download links. To get the actual UML tool you have to ignore the huge green buttons to download various SPAM ware products and click on a small download link in the middle left of the page. As far as the actual application The User interface is a little different but with a little practice you can get the hang of it. It prints diagrams well and allows you to export them to many different graphical formats. A great tool for doing some quick UML diagrams but probably not the right tool for doing a large UML model.

+easy to use

-no reverse engineering
-no update site for eclipse

PS This is the best UML tool because others including papyrus and omondo uml are unusable, probably this is a problem of GEF, which they use as their base.

I use UMLet since the TogetheJ was destroyed by Borland.
For more than 8 years UMLet is the best solution.
Thanks for the team.

This is by far the best UML modeling tool I've ever used, it compares well with (and in many ways it overtakes) other ineffective, costly and cumbersome programs. It's easy to use, standard compliant, lightweight and free: what else can we ask? Thanks a lot guys, great work!

I have a very low budget for software - open source all the way.
I use UMLet for ALL my drawing needs.
Any diagram explaining a process, idea, flow chart, whatever - UMLet.
Thanks for an excellent tool :-)

...for simplicity and power. After having used Rose, RSA, Visual Paradigm etc. I fell for Umlet. It is exactly what a programmer needs. Neither complex, nor lacking in capability.

This saved my life today when the UML app I paid for suddenly proved inadequete. But everything brightened back up again after a few minutes playing with umlet! Thanks!! One of the nicest new pieces of software I've used in a while. Totally straightforward, works smoothly, and the combination drag n' drop + text config interface is a GREAT IDEA. I used it stand-alone, and I bet the XML file format would be easy to parse for, eg, a custom code generator.

In reply to by Whisnu Sucitanuary

Explicit z-order control (useful for pdf exports of background-colored elements) will probably be included in v12.1; not yet in the upcoming v12.0.
--The UMLet Team

The UMLet authors don't seem to provide an update site. Dear UMLet authors, can you fix that? Pretty please with sugar on top.

I've been using UMLet for years, and will be using it for years to come.
The "All in one" digrams help you explore ideas visually as if you are coding.
As for complexity, there's always "just enough", and never "too much".
I love this tool!

Spent ages trying to find the useful links on umlet website, the design of which gives me no confidence that the makers are competent to write a graphics tool. Dropped jar in plugins. Started eclipse. Created new umlet. Clicked on "pallet". kill -9 eclipse. Removed plugin.

Major fail.

This is just full of spam! Can't install UMLet, nothing to download or install, and every post in the last 2 years is just simply SPAM! Crap...

In reply to by Boba Fett

Unfortunately, we can't remove spam postings from the comments. Thankfully, Marketplace cleans the comments periodically.
On you can see the change history, and download current and older versions of UMLet. As UMLet evolves, sometimes we break file format conventions (we assume UMLet is used for throw-away sketches and pdf exports) -- so it might be useful to occasionally get an older version.
--The UMLet Team

I've been using UMLet for a day so far, and I am vastly impressed with it! It is an amazing piece of software and a joy to use, thanks for your outstanding job!

Tried 3 or 4 other UML tools. They were really hard to use. Finally settled on this. What a pleasure to operate.

Excellent tool for UML. Used it for simple diagrams. Nice and intuitive use.

Thank you.

By far the best tool I have ever used for UML. No more clicking through endless dialogs to create a class diagram. I swear with some of those other tools it seems to take longer just defining the class diagram than it does to write the code for the class itself. I give it ALL STARS, Great Job :-)