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OTPfill vs Header Override

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

OTPfill compared with Header Override
DetailOTPfill logo OTPfillHeader Override logo Header Override
What it doesAutofill OTP codes from your email Open-source browser extension to modify HTTP request and response headers and cookies
StageNot given Not given
FoundedNot given Not given
Based inUS Not given
Pricing modelPaid Open source
PricingFree for 7 days, then $29 one-time payment. Includes two inboxes and updates. Unlimited inboxes available for $5 per month. Not given
Key features
  • Autofills one-time passcodes from email
  • Auto-fills codes from the current site
  • Reads only recent emails from last three minutes
  • Does not store or log email contents
  • 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
What makes it different
  • One-time purchase model with no subscription required
  • 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
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)9 no change since last check8 no change since last check
Trust Flow (Majestic)63
Citation Flow (Majestic)1118
Referring domains (Majestic)1013

4 details filled in for both companies.

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