How it works
Three steps, all on the page you're already looking at. Nothing to configure.
Open a listing
Browse any supported watch listing or search page as you normally would.
We find comparable prices
WatchSentry matches the watch's reference and pulls the median of active eBay listings for it over the last 90 days, converted to your listing's currency.
You see the gap
A badge shows the listed price versus fair value — green below the market, red above, neutral when it's close.
Where it runs
On watch-listing and search pages on these marketplaces only — nowhere else.
Built for buyers who want the truth
Quiet, private, and honest about what the number means.
No account
Nothing to sign up for. Install and it just works.
No personal data
No name, email, or IP. Just an anonymous ID for a daily usage cap.
Stays out of the way
One unobtrusive badge near the price. No pop-ups, no noise.
Currency-aware
EUR, GBP and CHF listings are converted before the comparison.
An estimate, not an appraisal. Fair value is the median of active eBay listings (asking prices) over a 90-day window — a fast market reference, not a sold-price valuation or financial advice. Always verify with an independent professional before a significant purchase.