
Scrimba
Codédex
GoIT LMS
Codelita
Data Protocol
codedamn
Codecademy
Programming exercises for experienced engineers.

Security Headers
Hardenize
Qualys SSL Server Test
Mozilla Observatory
Cloud Cultivator
Scorifya
Iron Check
Developed by Mozilla, the HTTP Observatory performs an in-depth assessment of a site’s HTTP headers and other key security configurations.

Which is more popular?
Based on our record, CodeCrafters seems to be more popular. It has been mentioned 11 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | codecrafters.io | developer.mozilla.org |
| Pricing | — | |
| Listed in |
An editorial look at what each product does well and who it suits.


No analysis of CodeCrafters yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Learn to Build Real Software With CodeCrafters
More videos
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How often each product is chosen within a category, 0–100% relative to the other.


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


Sometime ago, I decided to embark on a new endeavor, I was curious about how shell works, and came across the the codecrafters.io build your own shell challenge, and thought this is a good opportunity for me to learn shell, as well as... - Source: dev.to / 15 days ago
Submitting with git push also exists at CodeCrafters, for code you write from scratch. - Source: dev.to / 25 days ago
I had a lot of with Code Crafters. It's a paid platform, but they give you a basic walk through of different technologies, with full test suites. For example, you implement some basic Redis. It doesn't spoon feed you what to do, but... - Source: Hacker News / 10 months ago
Tracking HTTP Observatory since Feb 2025.
When comparing CodeCrafters and HTTP Observatory, you can also consider the following products.

Interactive coding screencasts created in an instant
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Quickly and easily assess the security of your HTTP response headers.
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Hardenize provides a comprehensive and free assessment of web site network and security configuration.
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Empowering emerging markets with high-quality tech education
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This free online service performs a deep analysis of the configuration of any SSL web server on the public Internet.
Compare Qualys SSL Server Test to CodeCrafters or HTTP Observatory: