Observed arrival · 2026-11-06
Tagtwin: the stranger-price checker
A free Chrome extension that compares a shopper’s product-page price with prices fetched in three clean-session scenarios.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Online shoppers checking for personalized price differences
- Worth noticing
- Warnings require a difference above both 5% and $5; blocked stranger checks are reported rather than guessed.
Field notes
The extension is described as comparing a product page against three kinds of clean-session visitors: logged-out shoppers with no history, phone users, and people arriving from a comparison site. Its warning rule combines two thresholds—more than 5% and more than $5—and the page says blocked checks are surfaced rather than treated as evidence of a price difference. It also describes local-only sharing and a permanent data-wipe control.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue