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Header Override vs SmartAutoFill

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 SmartAutoFill
DetailHeader Override logo Header OverrideSmartAutoFill logo SmartAutoFill
What it doesOpen-source browser extension to modify HTTP request and response headers and cookies AI form filler for Chrome and Edge extensions that fills job applications, Google Forms, CRM forms, and repetitive browser workflows
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelOpen source Freemium
PricingNot given Free: 20 free credits (about 6 AI fills) valid for 365 days. Starter: $9 for 300 credits (about 100 AI fills). Pro: $19 for 1000 credits (about 333 AI fills). Power: $49 for 3000 credits (about 1000 AI fills).
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
  • Context-aware field detection using labels, placeholders, IDs, nearby text, and options
  • Reusable profile data for contact, company, role, website, social, and signature details
  • Review on the page before submission
  • Sensitive-field guardrails excluding passwords, CAPTCHA, payment cards, banks, and identity verification
  • Hosted AI model with Google sign-in, no API key required
  • Advanced custom providers for existing API workflows
  • Support for job applications, Google Forms, CRM, and support forms
  • Chrome and Microsoft Edge browser support
  • Paid AI Materials for richer source context and file uploads
  • Manual form submission with no automatic submission
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
  • Review-first workflow where AI fills fields but users review and submit manually
  • No API key setup required for new users with hosted AI and Google sign-in
  • Handles complex form fields beyond just contact details
  • Reusable profile data keeps answers consistent across forms
  • Available directly from official Chrome Web Store and Microsoft Edge Add-ons
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 check3 no change since last check
Trust Flow (Majestic)33
Citation Flow (Majestic)1813
Referring domains (Majestic)1310

4 details filled in for both companies.

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