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Life & fun · alternatives · 2026

24 alternatives to Gleek diagram maker – UML class, Sequence, ER diagrams, Flowcharts

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

Gleek is a diagram maker tool that creates UML class diagrams, sequence diagrams, entity-relationship diagrams, and flowcharts. It is designed for developers, software architects, and technical teams who need to… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Gleek diagram maker – UML class, Sequence, ER diagrams, Flowcharts launched in 2021; newer entries below may have overtaken it.

  1. 1
    Gleek▲309

    Free online diagramming tool for developers

    2021 · gleek.io · its alternatives →

  2. 2

    🧜‍♀️ 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 →

  3. 3PT

    Create ER diagrams, SQL schemas, and DBML models. No Signup required, Nothing to install. All diagrams are 100% private, secure and processed locally right in your web browser

    2023 · databasediagram.com · its alternatives →

  4. 4

    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 →

  5. 5

    A tool for generating diagrams and flowcharts from text.

    2020 · quickdiagram.com · its alternatives →

  6. 6

    The simplest way to visualize ideas, plans & processes

    2020 · creately.com · its alternatives →

  7. 7

    Create beautiful user flow charts, sitemaps and wireframes

    2020 · antforfigma.com · its alternatives →

  8. 8

    Create beautiful user flows prototypes for your next project

    2017 · its alternatives →

  9. 9

    The easy way to make stunning diagrams

    2021 · venngage.com · its alternatives →

  10. 10
    UXFlow▲265

    Free customizable flowchart kit for Sketch and Figma

    2017 · uxflow.co · its alternatives →

  11. 11
    Mark▲358

    Create flowcharts & diagrams in seconds powered by AI

    2017 · apps.apple.com · its alternatives →

  12. 12

    Hey HN! We are Jonathan & Guy, and we are happy to share a project we’ve been working on. ChartDB is a tool to help developers and data analysts quickly visualize database schemas by generating ER diagrams with just one query. A unique feature of our product is AI-Powered export for easy migration. You can give it a try at https://chartdb.io and find the source code on GitHub. Next steps ---> More AI. We’d love feedback :)

    2024 · github.com · its alternatives →

  13. 13

    A diagram editor for visualizing structures and processes

    2020 · diagrams.app · its alternatives →

  14. 14
    Bhava▲316

    Transform your ideas into professional diagrams instantly with Bhava

    2025 · bhava.app · its alternatives →

  15. 15

    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 →

  16. 16

    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 →

  17. 17CA

    Last year we launched ChartDB OSS (https://news.ycombinator.com/item?id=44972238) - an open-source tool that generates ER diagrams from your database (via query/sql/dbml) without needing direct DB access. Now we’re launching the ChartDB Agent. It helps you design databases from scratch or make schema changes with natural language. You can: - Generate schemas by simply describing them in plain English - Brainstorm new tables, columns, and relationships with AI - Iterate visually in a diagram (ERD) - Deterministically export SQL script Try it out here -…

    2025 · app.chartdb.io · its alternatives →

  18. 18

    Hi HN, UML diagrams were meant to standardise system design, but they’ve become outdated — slow to build, hard to change, and rarely used in practice. Most tools feel clunky, and diagrams often go stale fast. I’m building RapidChart, a tool to bring diagramming back to life — fast, flexible, and developer-first. What makes it different: Cursor-style interface for rapid diagram creation Fully customisable and exportable AI-assisted (works with GPT-4, Claude, etc.) 100% free This began as part of my research at Imperial College London, and I’d really value your feedback. Here’s the link:…

    2025 · rapidcharts.ai · its alternatives →

  19. 19

    2025 · docs.mermaidchart.com · its alternatives →

  20. 20

    A lightweight UML class designer

    2022 · umlboard.com · its alternatives →

  21. 21

    Hi HN folks, I'm a co-creator of the Dapr CNCF project and co-founder of Diagrid. Today we announced a free-to-use web app that takes any form of workflow diagram (UML, BPMN, scribble in your favorite drawing tool or even on paper) and generates code that runs in any IDE and that can be deployed to Kubernetes and other container based systems, based on Dapr's durable execution workflow engine. This essentially allows you to run durable workflows in minutes and leaves out the guesswork for how to structure, code and optimize a code-first workflow app. I'm happy for you to give this a try and…

    2025 · workflows.diagrid.io · its alternatives →

  22. 22

    Open source database diagramming and automation tool - prahladyeri/VisualAlchemist

    2016 · github.com · its alternatives →

  23. 23

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

    2017 · chromewebstore.google.com · its alternatives →

  24. 24QS

    2013 · app.umlbin.com · its alternatives →

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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 →