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InstaPrompt 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.

InstaPrompt compared with Header Override
DetailInstaPrompt logo InstaPromptHeader Override logo Header Override
What it doesHighlight text on any web page and get an instant AI result. No tab switching. No copy-pasting. Open-source browser extension to modify HTTP request and response headers and cookies
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFreemium Open source
PricingFree: ~25 AI uses per month, 3 saved responses, 3 custom prompts, 1 label. Starter: $4.99/month or $3.25/month billed annually, ~500 AI uses per month, 10 saved responses, 15 custom prompts, 5 labels. Pro: $11.99/month or $8.25/month billed annually, ~2,500 AI uses per month, choose any AI model, br Not given
Key features
  • Select and click to run prompts on highlighted text
  • Right-click menu access to all prompts
  • Keyboard shortcut Alt+Shift+X for quick access
  • Popup launcher to paste or type text
  • Context Labels for saving tone and brand voice
  • Replace selected text with AI output
  • Cloud sync across multiple devices
  • Choice of AI models on Pro plan
  • 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
  • No API key required to get started with built-in AI
  • Works on any website without tab switching or copy-pasting
  • Context labels save and attach your tone to every prompt
  • 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)1 no change since last check8 no change since last check
Trust Flow (Majestic)33
Citation Flow (Majestic)1818
Referring domains (Majestic)1013

4 details filled in for both companies.

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