fastpen AlternativesCode Editors and other similar apps like fastpen

fastpen is described as 'Fastpen is an open source alternative to codepen that just stores the source code compressed, in the url' and is a Code Editor in the development category. There are more than 50 alternatives to fastpen, not only websites but also apps for a variety of platforms, including Self-Hosted, Android, Mac and Windows apps. The best fastpen alternative is Replit, which is free. Other great sites and apps similar to fastpen are CodePen, jsFiddle, JSPad and Glitch.

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Fastpen is an open source alternative to codepen that just stores the source code compressed, in the url.

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fastpen alternatives page was last updated Apr 8, 2025
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  1. Replit icon

    Replit

     80 likes
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    Replit is a collaborative cloud development environment offering in-browser IDE features like AI assistance, real-time collaboration, Git support, hosting, deployment, syntax highlighting, plugin extensibility, ad-free UI, dark mode, and live code sharing.

    64 Replit alternatives

    License model

    • Freemium • Proprietary

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    Replit screenshot 1

    Properties

    1.  Support for Themes

    Features

    1.  Run code
    2.  Code Completion
    3.  Real time collaboration
    4.  Dark Mode
    5.  Ad-free
    6.  Autocompletion
    7. Git icon  Git Support
    8.  Support for MarkDown
    9.  Support for Bootstrap
    10.  Extensible by Plugins/Extensions
    11.  Code Formatting
    12.  Syntax Highlighting

    Replit VS fastpen

     

    • Replit is the most popular Web-based, Android, iPhone & iPad alternative to fastpen.

    • Replit is the most popular free alternative to fastpen.

    • Replit is Freemium and Proprietaryfastpen is Free and Open Source
  2. CodePen icon

    CodePen

     117 likes
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    CodePen is a communal front-end development platform providing real-time HTML, CSS, and JavaScript previews. Users can build projects, test code, and enhance skills through challenges. Features include Presentation Mode for conferences and a vast active community for sharing and discovery.

    67 CodePen alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Online
    Auto Updating Previews: As you code, the preview updates automatically. Unless you don't want it to.

    Properties

    1.  Support for Themes

    Features

    1.  Live Preview
    2.  Running code
    3.  Sandbox
    4.  HTML/CSS/JS rendering
    5.  Code Formatting
    6.  Autocompletion
    7.  Syntax Highlighting
    8.  No registration required
    9.  Extensible by Plugins/Extensions
    10.  Support for MarkDown
    11.  Dark Mode
    12.  Real time collaboration

    CodePen VS fastpen

     
  4. jsFiddle icon

    jsFiddle

     141 likes
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    jsFiddle lets one easily test snippets of JavaScript/CSS/HTML code on-the-fly, adding optional libraries like jQuery.

    73 jsFiddle alternatives

    License model

    • Freemium • Proprietary

    Application type

    Country of Origin

    • PL flagPoland
    • European Union flagEU

    Platforms

    • Online
    jsFiddle screenshot 1

    Properties

    1.  Lightweight

    Features

    1.  Live Preview
    2.  Live coding
    3.  Sandbox
    4.  HTML/CSS/JS rendering
    5.  Text editing
    6.  Realtime development

    jsFiddle VS fastpen

     
  5. Ad
    Screenshot
    Replit icon
    Replit

    Replit is a collaborative cloud development environment offering in-browser IDE features like AI assistance, real-time collaboration, Git support, hosting, deployment, syntax highlighting, plugin extensibility, ad-free UI, dark m...

    https://replit.com
    Learn More
  6. JSPad icon

    JSPad

     8 likes
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    JSPad is a fast and lightweight online code editor for writing, testing, and previewing HTML, CSS, and JavaScript snippets instantly.

    License model

    • Free • Proprietary

    Application type

    Platforms

    • Online
    JSPad screenshot 1

    Properties

    1.  Distraction-free
    2.  Lightweight
    3.  Support for Themes

    Features

    1.  No Tracking
    2.  Live Preview
    3.  Ad-free
    4.  Syntax Highlighting
    5.  Dark Mode
    6.  No registration required
    7.  Code Formatting
    8.  Support for Bootstrap
    9. Git icon  Git Support
    10.  Web-Based
    11.  Sandbox
    12.  HTML/CSS/JS rendering

    JSPad VS fastpen

     
  7. Glitch icon

    Glitch

     23 likes
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    With working example apps to remix, a code editor to modify them, instant hosting and deployment - anybody can build a web app on Glitch.

    23 Glitch alternatives

    License model

    • Freemium • Proprietary

    Application types

    Platforms

    • Online
    The homepage

    Glitch Features

    1.  Live Preview
    2.  Cloud Servers
    3.  Cloud IDE
    4.  Private repositories
    5.  Community-based
    6.  File Storage
    7.  Dedicated Server Hosting
    8. Node.js icon  Support for Node.js
    9. GitHub icon  GitHub Integration

    Glitch VS fastpen

     
  8. JS Bin icon

    JS Bin

     64 likes
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    JS Bin is a collaborative open source JavaScript debugging tool. Enter Javascript in one pane and HTML in the other and see the result; share using a short URL. Choose popular JS libs from a menu, so you don't have to remember the URL.

    61 JS Bin alternatives

    License model

    • Freemium • Open Source

    Application types

    Country of Origin

    • GB flagUnited Kingdom

    Platforms

    • Online
    JS Bin screenshot 1
    Discontinued

    Last GitHub commit on Oct 2021.

    JS Bin Features

    1.  Run code
    2.  Mobile friendly

    JS Bin VS fastpen

     

    • JS Bin is the most popular Open Source alternative to fastpen.

    • JS Bin is Freemium and Open Sourcefastpen is Free and Open Source
  10. kodeWeave icon

    kodeWeave

     25 likes
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    kodeWeave is a realtime coding playground for HTML, CSS and Javascript. Similar to JSFiddle and JSBin, but kodeWeave was made to work offline but also as a prototyping application to build applications for desktop operating systems while on mobile devices.

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • Chrome OS
    • Android Tablet
    The kodeWeave Web Application
    Discontinued

    On their GitHub page: "As of July 25th 2017 kodeWeave is no longer an active project. All updates as of that date and on are solely contributor based implementations." Last update in November 2019.

    kodeWeave Features

    1.  No registration required
    2.  Portable
    3.  Real time collaboration
    4.  Debugging

    kodeWeave VS fastpen

     

    • kodeWeave is the most popular Windows, Mac & Linux alternative to fastpen.

    • kodeWeave is Free and Open Sourcefastpen is also Free and Open Source
  11. shelf.gg icon

    shelf.gg

     9 likes
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    shelf.gg is an open source pastebin that makes it easy to find and share lists of resources.

    112 shelf.gg alternatives

    License model

    • Free • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • Windows Phone
    • iPad
    • Self-Hosted
    • Linux Mobile
    shelf.gg screenshot 1
    Discontinued

    The latest update is from February 2022.

    shelf.gg Features

    1.  Content curation
    2.  Content Discovery

    shelf.gg VS fastpen

     

    • shelf.gg is the most popular Self-Hosted alternative to fastpen.

    • shelf.gg is Free and Open Sourcefastpen is also Free and Open Source
  12. Codewith.it icon

    Codewith.it

     4 likes
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    Codewith.it is an online HTML, CSS and JavaScript code playground with realtime preview with many tools for developing web pages and advanced code analysis systems, with many assistance tools.

    License model

    • Free • Proprietary

    Application type

    Platforms

    • Online
    HTML, CSS and JS codes editors generate a preview on right window, with element inspector

    Codewith.it Features

    1.  Live Preview
    2.  Autocompletion
    3.  Inspect Element
    4.  Syntax Highlighting
    5.  Code Formatting

    Codewith.it VS fastpen

     
  13. flems.io icon

    flems.io

     8 likes
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    Flems is a playground for web development. It's ideal for prototyping ideas & sharing working front-end code examples.

    License model

    • Free • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    flems.io screenshot 1

    Properties

    1.  Lightweight

    Features

    1.  No registration required
    2.  Live Preview
    3.  Support for MarkDown
    4.  Syntax Highlighting
    5.  Real time collaboration

    flems.io VS fastpen

     
  14. CodeSandbox icon

    CodeSandbox

     32 likes
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    CodeSandbox is an online editor with a focus on creating, sharing and importing new React projects

    27 CodeSandbox alternatives

    License model

    • Freemium • Open Source

    Application type

    Country of Origin

    • NL flagNetherlands
    • European Union flagEU

    Platforms

    • Online
    CodeSandbox screenshot 1

    CodeSandbox Features

    1.  Syntax Highlighting
    2.  Live Preview
    3. Git icon  Git Support
    4. GitHub icon  GitHub Integration
    5.  Cloud IDE
    6. Node.js icon  Support for Node.js
    7.  Sandbox
    8.  React

    CodeSandbox VS fastpen

     
  15. snippet.host icon

    snippet.host

     13 likes
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    snippet.host is a minimal text and code snippet hosting. With memorable domain name, it is free, lightweight, with no ads or cookies. Features include syntax highlighting in multiple languages, easy-to-use API and Tor hidden service support.

    License model

    • Free • Proprietary

    Application type

    Platforms

    • Online
    snippet.host screenshot 1

    snippet.host Features

    1.  Snippets Manager
    2.  Snippets

    snippet.host VS fastpen

     
12 of 51 fastpen alternatives