Dev tools · alternatives · 2026

24 alternatives to UMLTree

Online PlantUML Sequence Diagram Designer

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. UMLTree launched in 2020; newer entries below may have overtaken it.

1. 1
   An online collaborative UML editor using PlantUML▲116

   TAKTIK88 menghadirkan perpaduan strategi, gaya bermain, dan nuansa sultan paling prestisius. Temukan informasi menarik, inspirasi taktik, serta pengalaman digital berkelas dalam satu tempat.

   2020 · collabuml.com · its alternatives →

2. 2
   PlantUML based collaborative UML editor is now open source▲185

   A collaborative UML editor; build with etherpad and plantuml - AlexITC/collabuml

   2023 · github.com · its alternatives →

3. 3
   Programmatically Generate Diagrams for GitHub Readmes▲220

   🧜‍♀️ RESTful rendering pipeline for generating sequence and UML diagrams using Mermaid for Markdown docs (Diagrams as a Service) - Schachte/Mermrender

   2019 · github.com · its alternatives →

4. 4
   Clang-uml – C++ to UML diagram generator based on Clang▲79

   Hi, clang-uml is an open-source C++ to UML diagram generator, driven by YAML configuration files. The main idea behind the project is to easily maintain up-to-date diagrams within a code-base or document legacy code. The configuration file for clang-uml defines the types and contents of each generated diagram. The diagrams can be currently generated in PlantUML and JSON formats. Main features: - class, sequence, package and include diagrams - up to C++17 with support for C++20 concepts - visualization of template specialization relationships - declarative diagram content filtering based on…

   2023 · github.com · its alternatives →

5. 5
   Plantdiagrams▲16

   Hi HN! I couldn’t find a truly user-friendly PlantUML editor, so I set out to build one. PlantDiagrams lets you describe a diagram in plain English; it generates the PlantUML and renders it instantly. The goal is to shorten the path from idea → diagram without fighting the editor. Tech: - Next.js / Supabase / FLy.io / Vercel Highlights - Natural-language to PlantUML with live preview - Export diagrams (SVG/PNG/TXT) - Organize work with Projects - Share via link; optional comments for review - Sample gallery to open and tweak examples Try it:…

   2025 · plantdiagrams.com · its alternatives →

6. 6
   Gleek diagram maker – UML class, Sequence, ER diagrams, Flowcharts▲56

   Create diagrams without touching your mouse. Generate informal, class, sequence, state, gantt, user journey or entity-relationship diagrams using only the keyboard.

   2021 · gleek.io · its alternatives →

7. 7
   UMLCN▲8

   Plantuml | umlcn

   2025 · umlcn.com · its alternatives →

8. 8
   PlantUML▲8

   Create diagrams by describing them in plain text

   2017 · plantuml.com · its alternatives →

9. 9
   UMLBoard▲82

   A lightweight UML class designer

   2022 · umlboard.com · its alternatives →

10. 10
    UXFlow▲265

    Free customizable flowchart kit for Sketch and Figma

    2017 · uxflow.co · its alternatives →

11. 11
    UX Flow Wireframe Prototyping System▲453

    Create beautiful user flows prototypes for your next project

    2017 · its alternatives →

12. 12
    UX Toolkit for Figma▲298

    Create beautiful user flow charts, sitemaps and wireframes

    2020 · antforfigma.com · its alternatives →

13. 13
    Simulate 3D plants in the browser▲439

    2023 · plant.max-richter.dev · its alternatives →

14. 14QS
    quickly share UML diagrams▲45

    2013 · app.umlbin.com · its alternatives →

15. 15
    Web Sequence Diagrams▲7

    Generate awesome UML Sequence Diagrams from plain text

    2017 · websequencediagrams.com · its alternatives →

16. 16
    PlantUML Web Editor▲9

    Create, collaborate, and share UML diagrams

    2025 · its alternatives →

17. 17
    Bhava▲316

    Transform your ideas into professional diagrams instantly with Bhava

    2025 · bhava.app · its alternatives →

18. 18
    Design System in Figma by Design+Code▲494

    Guide to designing a site using a design system by Meng To

    2018 · designcode.io · its alternatives →

19. 19
    PlantUML examples for UML, wireframes, mind maps, Gantt, C4, and more▲10

    PlantUML eaxmples for UML, ERD, wireframes, mind maps, JSON, YAML, WBS, ASCII art, Gantt charts, C4 models, and more - joelparkerhenderson/plantuml-examples

    2023 · github.com · its alternatives →

20. 20
    Diagram as code tool with draggable customizations▲266

    In the past I've used declarative diagram generation tools like Mermaid.js a lot for quickly drawing up things but for presentations or deliverables I find that I have to then move the generated diagrams over to a tool like Lucidchart which allows full control of the organization and customization. Therefore I am now working on this to combine the benefits of both into just one tool which can do both functions. The project is certainly in the early stages but if you find yourself making architecture diagrams I'd love to hear your thoughts on the idea or even a Github issue for a feature…

    Oct 2025 · github.com · its alternatives →

21. 21
    OnUml▲13

    AI-powered UML diagram generator for free

    2025 · onuml.com · its alternatives →

22. 22
    DrawSQL▲246

    Better entity relationship diagrams for your database

    2018 · drawsql.app · its alternatives →

23. 23
    Scheme Flowcharts▲177

    A huge pack of layouts for UX prototyping

    2018 · its alternatives →

24. 24
    Web Sequence▲77

    A Chrome extension that saves you time drawing diagrams 👨🏻‍💻

    2017 · chromewebstore.google.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →