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Header Override vs Content SEO Check

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 Content SEO Check
DetailHeader Override logo Header OverrideContent SEO Check logo Content SEO Check
What it doesOpen-source browser extension to modify HTTP request and response headers and cookies See your page's SEO structure in one click
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelOpen source Free
PricingNot given Not given
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
  • Analyze headings (H1–H6) with structure warnings
  • Internal link checker with anchor text and destination URLs
  • External link audit with rel attributes
  • In-content link analysis with word count
  • Clean Markdown export with filtered content
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
  • No account or login required
  • Completely free to download and use
  • Analyzes locally without sending data externally
  • Five focused tools in one lightweight extension
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)20 +5 (up) since last check45 no change since last check
Trust Flow (Majestic)317
Citation Flow (Majestic)1831
Referring domains (Majestic)13161

4 details filled in for both companies.

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