Software · Development

UMLet

Name: UMLet
Author: umlet

UMLet is a diagramming program, available on Windows, macOS and Linux.

Completely free
Windows, macOS and Linux
Open source

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by Flathub
License: GPL-3.0 — Open source (copyleft)confirmed by Flathub
Open source: Yes
Commercial use: Yesconfirmed by Official plan pages (pricing, licence, terms), Flathub
Account required: not documented
Credit card required: Noconfirmed by Flathub
Watermark: Not applicable
Ads: not documented
Platforms: Windows, macOS and LinuxEstablished by Linux: Flathub, Unspecified source · macOS: Unspecified source · Windows: Unspecified source
Publisher: umlet
Latest version: 15.1.0 (20 March 2023)
Latest activity: 3 October 2026

Overview

UMLet is a diagramming program, available on Windows, macOS and Linux.

File formats mentioned: PDF and SVG.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Free UML Tool for Fast UML Diagrams” — Flathub, 10 November 2026

At a glance

UMLet is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
Commercial use allowed

About

UMLet is an open-source UML tool with a simple user interface: draw UML diagrams fast, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements. NOTE: This is an unofficial package based on the official zip-file releases from www.umlet.com.

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 10 November 2026
Facts collected from Unspecified source (platforms) — 9 November 2026
Facts collected from Flathub (credit card, publisher, licence, free status, platforms, commercial use, version) — 8 November 2026
Last technical check: 8 November 2026
Description from Flathub — AppStream (Flathub)

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