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Header Override vs Fog Mode

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 Fog Mode
DetailHeader Override logo Header OverrideFog Mode logo Fog Mode
What it doesOpen-source browser extension to modify HTTP request and response headers and cookies Free Chrome extension with reading tools, focus aids, and wellness breaks for managing brain fog while reading
StageNot given Startup
FoundedNot given 2025
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
  • Larger, roomier text formatting
  • Focus line guide for reading
  • Clean reader interface
  • Auto-scroll functionality
  • Ambient sounds
  • Breathing break reminders
  • Integrated notes feature
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
  • Designed specifically for people with brain fog
  • Combines reading assistance with wellness features like breathing breaks
  • Completely free with no paywalls or premium tiers
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)8 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)30
Citation Flow (Majestic)1815
Referring domains (Majestic)134

4 details filled in for both companies.

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