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

Devhints
OverAPI
1400+ developer cheat sheets for programming, cloud, AI, DevOps, data, and certifications. Includes practice tests, interactive Mind Maps, Cookbooks, My Vault, XP tracking, and advanced search. Free cheat sheets available, no signup required.

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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| Website | codepen.io | cheatgrid.com |
| Pricing | — | |
| Platforms | — | |
| Company | — | Startup from Czechia · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of CodePen yet.
What is CheatGrid? Most references are a wall of prose, or stop at the obvious basics. CheatGrid is different: every topic is a cheat sheet broken into clean concept, example, description tables, sorted from most-used to most-advanced, with an interactive mind map and a quick index. Each sheet...
What each product offers, as listed by its team.


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


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
What Is Codepen?
More videos
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing CodePen and CheatGrid.
CheatGrid's answer:
Every cheat sheet uses the same consistent 3-column format (concept → example → description), ordered from most practical to most advanced. Most resources cover only the obvious top 20% — CheatGrid covers the full topic including edge cases and advanced patterns. Every topic also comes with an interactive Mind Map, and the platform combines reference lookup with practice tests, certification prep, XP tracking, and a personal vault — all in one place.
CheatGrid's answer:
Tools like devhints.io and OverAPI are community-contributed with no consistent structure. CheatGrid uses a single carefully designed format across all 1300+ topics, sorted by real-world importance rather than alphabetically. It goes beyond lookup — practice tests, certification study guides, Mind Maps, and progress tracking mean you can learn and certify, not just reference.
CheatGrid's answer:
Developers, data engineers, DevOps professionals, cloud architects, and tech professionals who regularly look things up at work, prepare for technical interviews, or study for certifications. Also used by students and career-switchers entering the tech industry.
CheatGrid's answer:
Built out of frustration with spending 30+ minutes a day re-searching the same answers across dozens of tabs and articles. The idea: one structured, consistent place for every technical topic — not a wiki, not a forum, but a reference you can scan in seconds and actually trust.
CheatGrid's answer:
Next.js, React, TypeScript (frontend); Convex (backend/database/auth); Python + FastAPI (AI chatbot RAG pipeline); Vercel (hosting).
CheatGrid's answer:
Individual developers, data professionals, and engineers using it for daily lookup and certification prep.
Share your experience with using CodePen and CheatGrid. 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 CheatGrid 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 / 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
Tracking CheatGrid since Jun 2026.
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Code, create, andlearn together. Use our free, collaborative, in-browser IDE to code in 50+ languages — without spending a second on setup.
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