AI · alternatives · 2026

24 alternatives to Visimer – open-source visual editor for Mermaid diagrams

Hi HN, Nick here, founder at OpenKnowledge. We built an open source library, Visimer, for editing Mermaid diagrams with a what-you-see-is-what-you-get visual editor. Try the playground at https://visimer.com/playground. You can rename labels, change shapes, add new nodes, etc. by clicking and dragging the visual canvas. We set out to build this originally for OpenKnowledge, our markdown wysiwyg editor, then realized it’d be great to share it as a proper embeddable component library so that other apps can leverage it as well. Our general take is that AI is great for generating…

Visimer is an open-source visual editor that allows users to edit Mermaid diagrams through a what-you-see-is-what-you-get interface. Instead of manually writing syntax, users can rename labels, change shapes, and add… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1
GUI for editing Mermaid class diagrams▲230
2025 · docs.mermaidchart.com · its alternatives →
2
Mermaid AI▲256
Maximize your diagramming efficiency with Mermaid AI
2024 · mermaid.ai · its alternatives →
3
Beauty Diagram▲98
Mermaid online live editor that beautifies flowcharts and activity diagrams — also supports PlantUML and draw.io. Live preview, one-click beautify, clean SVG / HD PNG export.
May 2026 · beauty-diagram.com · its alternatives →
4MA
Mermaid ASCII Diagrams▲234
2024 · mermaid-ascii.art · its alternatives →
5
Ferrite – Markdown editor in Rust with native Mermaid diagram rendering▲241
Ferrite: Fast Markdown/Text/Code editor in Rust with native Mermaid diagrams Built a Markdown editor using Rust + egui. v0.2.1 just dropped with major Mermaid improvements: → Native Mermaid diagrams - Flowcharts, sequence, state, ER, git graphs - pure Rust, no JS → Split view - Raw + rendered side-by-side with sync scrolling → Syntax highlighting - 40+ languages with large file optimization → JSON/YAML/TOML tree viewer - Structured editing with expand/collapse → Git integration - File tree shows modified/staged/untracked status Also: minimap, zen mode,…
Jan 2026 · github.com · its alternatives →
6
Mermaid Chart▲176
A smarter way to create diagrams
2023 · mermaid.ai · its alternatives →
7
Mermaid Flow▲32
Mermaid Flow is a Visual Mermaid live editor that aims to simplify creating Mermaid JS Diagrams online. Currently Mermaid Flow supports Flowchart diagrams, giving you the ability to Drag and Drop nodes, edges and labels to create your Flowchart diagrams visually. This mermaid live editor is useful f
2023 · mermaidflow.app · its alternatives →
8
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 →
9
Fanfa – Interactive and animated Mermaid diagrams▲154
Create cinematic, animated Mermaid diagrams with our powerful Motion Engine. Export to video, share with your team, and bring your flows to life.
Dec 2025 · fanfa.dev · its alternatives →
10
Mermaid Open Editor 2.0▲6
A new feature from Mermaid Chart allows users to easily share text-based diagrams with others. What is Mermaid Chart? It’s an extension of open source diagramming tool Mermaid: https://mermaid.js.org. I created Mermaid to make diagramming more fun again. Mermaid Chart helps to bring this to life. With Mermaid Chart, users can easily generate a wide range of charts – flowcharts and pie charts to sequencing diagrams, user journeys, and Gantt – from simple, markdown-style code. Our new Teams feature means these users can securely share diagrams with others, opening up a clear path for…
2025 · mermaidchart.com · its alternatives →
11
Visme 3.0▲295
Create stunning slides, infographics & designs in minutes.
2018 · visme.co · its alternatives →
12
Line9 – A Mermaid rendering engine with its own layout▲87
Line9 is a new rendering engine for Mermaid flowchart diagrams that aims to remove the need for manual adjustment of layout. Mermaid is a popular text-based language for describing multiple types of diagrams. Several Mermaid rendering engines already exist. Most, like the original mermaid.js, use Dagre or ELK graph drawing libraries to automatically lay out their diagrams. I’ve used Mermaid for the past four years but often recreated my flowcharts in a diagram editor so that I could modify the layout to something that better suited my needs. Use Line9 when you want an automatic flowchart…
Aug 2026 · line9.ai · its alternatives →
13
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 →
14
VPaint▲145
The next Adobe Illustrator and After Effects, open-source
2021 · vpaint.org · its alternatives →
15
Sketch2scheme▲208
Convert hand-drawn diagrams into digital schemes
2024 · sketch2scheme.com · its alternatives →
16
Svelvet – A component library for building interactive flow diagrams▲354
2022 · svelvet.io · its alternatives →
17
An open-source, collaborative, WYSIWYG Markdown editor▲460
Inspired by the design and UI/UX of apps like Notion, and utility of open-source apps like StackEdit, I decided to create a minimalistic, local-only WYSIWYG Markdown editor. Some features worth highlighting: - Monaco editor and Prettier integration for code snippets - Tables (apparently the holy grail of WYSIWYG editing) - Embeds (for CodePen, CodeSandbox and YouTube, most useful for HTML or JSON exports) - Accepts Markdown paste-in, and "exports"/generates HTML, Markdown and JSON outputs - Collaboration (with real-time awareness and initial commenting system, available only when…
2023 · editor.vrite.io · its alternatives →
18
Neptune by Hashnode▲250
Our Markdown-based WYSIWYG editor for composing blog posts
2022 · hashnode.com · its alternatives →
19
Visme for Infographics▲281
Create infographics in minutes from ready-made blocks.
2017 · visme.co · its alternatives →
20VO
Visprex – Open-source, in-browser data visualisation tool for CSV files▲194
Hello HN. I've always found writing data visualisation scripts boring and repetitive in data science workflows earlier in my career, so I built this tool to automate it. The available methods are based on my experience in econometrics where histograms and scatterplots were the starting points to check data distributions. The link is to the documentation and the app is freely available at https://visprex.com, and if you're curious about the implementation it's open source at https://github.com/visprex/visprex. I'd appreciate any comments and feedback!
2024 · docs.visprex.com · its alternatives →
21
Visme Flowchart Maker▲148
Create professional flowcharts in minutes
2018 · visme.co · its alternatives →
22
Visdiff▲168
Stop bridging the design-to-code gap, close it
Mar 2026 · visdiff.com · its alternatives →
23
Visily 2.0▲220
From ideas to prototypes in a flash, no design skills needed
2023 · visily.ai · its alternatives →
24
Collaboratively Edit Diagrams in VS Code with Draw.io▲142
This unofficial extension integrates Draw.io (also known as diagrams.net) into VS Code. - vscode-drawio/README.md at 14209ad462028cbf7013bc8e094bf0fc6e811d30 · hediet/vscode-drawio
2020 · github.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 →