ABCmouse.com
Starfall
Lingokids
Khan Academy Kids
PBSKids
Starfall Free
Zape Learning App
One-click preschool ESL curriculum generator for ages 3-6. Generates flashcards, worksheets, tests, lesson plans and PowerPoint slides together, plus simple classroom management and free vocabulary games.

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

Which is more popular?
Based on our record, CodePen seems to be more popular. It has been mentioned 513 times since March 2021.
Website, pricing, platforms and company facts side by side.
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SimpsonESL
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| Website | simpsonesl.com | codepen.io |
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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.
Recommendations tracked on public social media and blogs since March 2021.

Tracking SimpsonESL since Jul 2026.
> 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 / 2 months 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 / 3 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 / 12 months ago
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You are a fallen star, catch the glows and avoid black holes to run back home! - FrancescoBonizzi/StarfallGame
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Lingokids is an interactive learning app offering over 1200 activities across various subjects such as math, reading, science, art, and life skills, all designed to foster a child's academic growth and emotional development while tracking their prog…
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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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