VS Code
CodePen
GitHub
Node.js
RegExr
JSFiddle
CodeSandbox
Free ebook for the JS Beginners

Helium
PiP-Tool
PiP for Mac
Afloat
PiPifier
PiPer
Picture In Picture
Cross-platform application to open any website or media in a floating window

Which is more popular?
Based on our record, Eloquent JavaScript seems to be a lot more popular than Pennywise. While we know about 218 links to Eloquent JavaScript, we've tracked only 1 mention of Pennywise.
Website, pricing, platforms and company facts side by side.
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EJS
Eloquent JavaScript
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| Website | eloquentjavascript.net | github.com |
| Pricing | — | |
| Listed in |
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 Pennywise yet.
Walkthroughs and reviews on video.
Eloquent JavaScript A Modern Introduction to Programming 3rd Edition by Marijn Haverbeke review
More videos
NECA IT 2017 Ultimate Pennywise the Dancing Clown | Video Review
More videos
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Eloquent JavaScript and Pennywise. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

If you haven’t read Eloquent JavaScript , go check it out. It’s one of my all-time favourite programming books — hands down. - Source: dev.to / about 1 year ago
Videos, blogs, text-based teachings, YouTube project-based learning, books, and the like are all examples of various methods and mediums of acquiring skills, especially in the software engineering industry. As I continue to navigate... - Source: dev.to / almost 2 years ago
Seconded. I won't recommend it and no one I know has recommended it for a decade. It's hard for someone who doesn't know JS to know which parts has changed and is no longer the way to do things. https://github.com/getify/You-Dont-Know-JS... - Source: Hacker News / about 2 years ago
Afloat - Don't know if it will work for macOS 12. If it's just for safari alone, you can try Pennywise. Source: over 4 years ago
When comparing Eloquent JavaScript and Pennywise, you can also consider the following products.

Build and debug modern web and cloud applications, by Microsoft
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Helium lets you accept payments by credit card for anything you want to sell online.
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A front end web development playground.
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PiP tool is a software to use the Picture in Picture mode on Windows.
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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.
Compare GitHub to Eloquent JavaScript or Pennywise:

Always on top window preview similar to the popular windows only OnTopReplica
Compare PiP for Mac to Eloquent JavaScript or Pennywise: