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Header Override vs 30 Seconds of Knowledge

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Header Override compared with 30 Seconds of Knowledge
DetailHeader Override logo Header Override30 Seconds of Knowledge logo 30 Seconds of Knowledge
What it doesOpen-source browser extension to modify HTTP request and response headers and cookies Keep your engineering skills sharp with one real code snippet on every new tab
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelOpen source Free
PricingNot given Free
Key features
  • Modify request and response headers with a focused editor interface
  • Scope rules to specific URLs using browser-supported filter patterns
  • Customize response cookies with Domain, Path, SameSite, Lifetime, Max-Age, and Secure attributes
  • Create up to five local rule profiles for different projects and test setups
  • Import and export profiles as local JSON files between browsers
  • Enable, disable, delete, and annotate rules with comments
  • Support for Chrome, Edge, and Firefox
  • All rules stored locally in browser with no server transmission
  • Support for JavaScript, Python, React, Git, C++, C#, CSS, Dart, Go, HTML, PHP, and Interview Questions
  • Live Preview for CSS snippets
  • Random snippet or browse favorites and all snippets
  • Available on Chrome, Firefox, Edge, Brave, and Arc
  • Open source project on GitHub
What makes it different
  • Open-source with MIT License and full transparency
  • Rules stored entirely locally with no analytics, tracking, or external servers
  • Lightweight alternative to ModHeader
  • URL scoping prevents rules from affecting unintended websites
  • Simple interface requires no coding knowledge
  • Helps prevent engineering skill atrophy in the age of AI
  • One real code snippet delivered every new tab without requiring courses or streaks
  • 25,000+ developers using the extension with 1,000+ GitHub stars
  • Featured as #2 Product of the Day on Product Hunt
  • 5-star rating on Chrome Web Store
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)14 +6 (up) since last check9 no change since last check
Trust Flow (Majestic)34
Citation Flow (Majestic)1820
Referring domains (Majestic)1373

4 details filled in for both companies.

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