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

iruler.net
Online Ruler
Nexmetra Ruler
On-Screen Ruler
Mesu.ro
ImageJ
Privacy Friendly Ruler
Measure anything in actual size with our on-screen ruler. Multiple ruler types for shoe, bra, ring, image & 3D model sizes at home. No physical ruler needed.

Which is more popular?
Based on our record, Eloquent JavaScript seems to be more popular. It has been mentioned 218 times since March 2021.
Website, pricing, platforms and company facts side by side.
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Eloquent JavaScript
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| Website | eloquentjavascript.net | ruler.im |
| Pricing | — | |
| Company | — | 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Eloquent JavaScript yet.
Years ago, when a classmate asked if I had a measuring tape, I instinctively handed over my charging cable and looked up its length. That simple moment inspired Ruler.im Ruler.im helps you measure real-world items like shoe sizes or body measurements. It also lets you scale online images to...
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Why this product is good
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Overall verdict
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Walkthroughs and reviews on video.
Eloquent JavaScript A Modern Introduction to Programming 3rd Edition by Marijn Haverbeke review
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Share your experience with using Eloquent JavaScript and Ruler.im. 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
Tracking Ruler.im since Dec 2025.
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Build and debug modern web and cloud applications, by Microsoft
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Online ruler in actual size - cm & inches.
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Free and accurate online ruler to measure real objects on your screen in inches, cm, and mm. Calibrate easily for actual physical size to scale.
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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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Free online ruler & digital measuring ruler — measure real objects at actual size in cm, mm, and inches directly on screen. No download, instant, accurate.
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