Life & fun · alternatives · 2026

Atomic Editor is a CodeMirror 6-based text editor that provides live preview functionality similar to Obsidian. It allows users to see rendered content alongside their code as they type. The editor is designed for… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Atom v1.0▲423

   The modern & hackable text editor from GitHub

   2015 · github.blog · its alternatives →

2. 2
   Atomic▲444

   The fastest way to design beautiful interactions

   2015 · atomic.io · its alternatives →

3. 3AB
   Applesoft BASIC editor with example programs▲61

   This is an Applesoft BASIC editor that extracts and updates code into a live Apple II VM. You can load examples through the dropdowns at the top-right of the screen. The CodeMirror-based editor separates out 'stacked' BASIC lines to make them easier to read.

   2024 · paleotronic.com · its alternatives →

4. 4
   Atomic.io 2.0▲328

   Ultra fast, scalable and fully collaborative prototyping

   2016 · atomic.io · its alternatives →

5. 5
   OpenKnowledge – open source AI-first alternative to Obsidian/Notion▲381

   Hi HN, Nick here. We’re launching OpenKnowledge (https://openknowledge.ai/), a “what you see is what you get” markdown editor that has direct integrations with Claude, Codex, and other agents. Available as MacOS app or Web UI+CLI. Fully free/local and OSS. We built this because we wanted a Notion-like experience for writing and sharing markdown files across our team. Obsidian is the best alternative we tried, but found it doesn’t have a true WYSWIG UI and it didn’t integrate well with Claude/Codex outside of community plugins. So we built OpenKnowledge. It takes…

   Jun 2026 · github.com · its alternatives →

6. 6
   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 →

7. 7
   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 →

8. 8
   kuku▲539

   Your open-source, local second brain for every AI

   Jan 2026 · kuku.mom · its alternatives →

9. 9
   Opal Editor, free Obsidian alternative for markdown and site publishing▲36

   A fully featured markdown editor and publisher. Free, open-source and browser-first (no backend required). Built with modern technologies like React, TypeScript, Shadcn/UI, and Vite. (thoughtfully crafted, not vibe coded)

   Jan 2026 · github.com · its alternatives →

10. 10
    Neptune by Hashnode▲250

    Our Markdown-based WYSIWYG editor for composing blog posts

    2022 · hashnode.com · its alternatives →

11. 11
    Editor X▲319

    Advanced web design platform

    2020 · wix.com · its alternatives →

12. 12
    Pinegrow + Atom▲181

    The perfect IDE for the web

    2016 · pinegrow.com · its alternatives →

13. 13
    Zed 1.0▲365

    High-performance, open source, multiplayer code editor

    May 2026 · zed.dev · its alternatives →

14. 14
    Monaco Editor▲98

    A browser based code editor

    2016 · microsoft.github.io · its alternatives →

15. 15
    Markdown Preview▲211

    Markdown Editor with instant preview using GitHub CSS.

    2022 · freecodetools.org · its alternatives →

16. 16
    ORY Editor – A rich editor for the browser, built with React and Redux▲369

    Next-gen, highly customizable content editor for the browser - based on React and written in TypeScript. WYSIWYG on steroids. - react-page/react-page

    2017 · github.com · its alternatives →

17. 17
    Slate-md-editor – A markdown editor that allows live editing▲123

    📝Rich Text / WYSIWYG Editor built for Modularity and Extensibility. - CannerCMS/canner-slate-editor

    2018 · github.com · its alternatives →

18. 18
    A renderless and extendable rich-text editor for Vue.js▲278

    The headless rich text editor framework for web artisans. - ueberdosis/tiptap

    2019 · github.com · its alternatives →

19. 19
    MarkdownX▲258

    A new markdown editor built for the TallStack

    2021 · devdojo.com · its alternatives →

20. 20
    CODECAST▲254

    HTML & CSS editor in your browser with real-time previews

    2015 · codecast.me · its alternatives →

21. 21
    OpenMarkdown▲189

    A feather-light, local-first Markdown editor built for you and your agent.

    Jul 2026 · openmarkdown.dev · its alternatives →

22. 22
    ArachStudio ▲80

    Live-edit your GitHub components directly in the browser

    Jul 2026 · arachstudio01.vercel.app · its alternatives →

23. 23
    Atom▲145

    A hackable text editor for the 21st Century

    2014 · github.blog · its alternatives →

24. 24
    React Markdown Editor▲97

    A simple React markdown editor with preview

    2021 · github.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 →