
JSFiddle
CodeSandbox
GitHub
replit
VS Code
Pastebin.com
JS Bin
A front end web development playground.

Flash Player 2021
SuperNova Player
X (Twitter)
Newgrounds Player
CheerpX for Flash
Ruffle
Gnash
Open-source re-implementation of Silverlight on modern browsers using WebAssembly.

Which is more popular?
Based on our record, CodePen seems to be a lot more popular than OpenSilver. While we know about 513 links to CodePen, we've tracked only 13 mentions of OpenSilver.
Website, pricing, platforms and company facts side by side.
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| Website | codepen.io | opensilver.net |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of OpenSilver yet.
Walkthroughs and reviews on video.
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using CodePen and OpenSilver. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Codepen is a social network for developers to show off their work, ask and answer questions, and exchange ideas. It's like a Reddit for coding and design, with a large community of talented web developers.
Codepen is a social development environment that allows developers to showcase their work and experiment with HTML, CSS, and JavaScript in a collaborative space. Codepen’s focus on visual and interactive development...
Codepen is a social development environment for front-end designers and developers. Build and deploy a website, show off your work, build test cases to learn.
We have no reviews of OpenSilver yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


> I vividly remember IE and many hacks to have css elements properly working in it… The common advice now is to only use CSS that is supported in the last two major versions of each major browser. You can check any css property's support... - Source: Hacker News / about 1 month ago
Thank you, heartfelt... For sharing an artwork, a miracle! Just in case, have you considered publishing the work at platforms as CodePen, where genius Artists/People express their art, too, as you?: // https://codepen.io/. - Source: Hacker News / 2 months ago
Embed on DEV: If you prefer CodePen embed, create a Pen with that HTML and add to the post as: {% codepen https://codepen.io//pen/ %}. - Source: dev.to / 11 months ago
- XAML autocompletion, AI error fixing, split editor views The visual designer is the differentiator: 100+ drag-and-drop controls for building UIs. But the NuGet and sharing features work even if you ignore the designer entirely and just... - Source: Hacker News / 7 months ago
Beside already mentioned, there is OpenSilver[1]. Supports Silvelight and WPF. Renders to DOM+WASM. They are also planning support for MAUI. [1] https://opensilver.net/. - Source: Hacker News / 10 months ago
I would also say that IF blazor worked on a browser plugin like silverlight did, today that's not the case it is built on the webassembly standard which and it is being adopted in the browsers which means once it gets on the web, it is... - Source: dev.to / over 2 years ago
When comparing CodePen and OpenSilver, you can also consider the following products.

Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
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Want to fix "This plugin is not supported" and "Adobe Flash Player is blocked" error messages? This extension will remove those messages and allow you to play Flash in any website with a single click.
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SuperNova Player allows systems to play .SWF files in a standalone player launched from any browser.
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Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
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Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
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