How it works
You shop the way you always have. Sinclair does the checking you never had time for.
You look at a product
On any Amazon product page, Sinclair wakes up automatically. Nothing to click, nothing to sign into.
Sinclair reads the history
12 months of that product's real price record: what it actually sold for, not what the seller says it was worth.
One plain verdict appears
Right on the page, before you click buy. The evidence is there if you want to look deeper. The conclusion is there if you don't.
The four verdicts
Only four possible answers, each one deliberately simple. Two give you permission, one exposes the trick, one admits the limits.
The price is at or near this product's true low over its recorded history. Not "lower than the sticker," which any seller can arrange, but low against what it actually sold for.
The discount is manufactured: the reference price is not what this product actually sells for, whether it was raised last week or has stood above the real price all along. Invisible without price history, obvious with it.
This is roughly what the product usually costs. Not a warning; if you need it today, the normal price is a fair price. Just the truth, so you decide with accurate expectations.
A tool that always has an answer is guessing some of the time. Our standard is the opposite: every verdict backed by data, or no verdict at all. When we don't know, we say so.
GENUINE DEAL
Not ready to buy the product yet? Save it.
Tap Save and the product goes to your Sinclair list, not your Amazon cart. Your list stays in your own browser, so nobody who shares your Amazon account checks out a pile of things you were only thinking about. Open it anytime from the Sinclair icon at the top right of Chrome, and Sinclair re-checks every verdict when you do.
Your saved list shows each product's verdict, never a price, and it is stored in your browser and never sent anywhere.
Why a verdict instead of a chart
Price history charts have existed for years, and most shoppers never use them, because reading a chart at the moment of purchase is work. You came to buy headphones, not to interpret a graph.
A verdict is the chart's conclusion with the work already done. The evidence stays available for anyone who wants to look deeper. But nobody has to earn the truth by studying a graph; it's just there, in plain words, next to the price it describes.
The privacy promise
Sinclair reads the product page you are on. Nothing else. No browsing history, no tracking across sites, and the narrowest permissions Chrome allows for the job. Any future feature that learns your preferences requires your explicit approval first. How we make money: a small commission from Amazon when you buy through our deal pages (it never changes your price), and members who choose our premium tools. We will never sell your personal information. We answer to you, not advertisers.
The verdict will always be free. Founding membership is limited to 500 people: reserving a spot is free, there is nothing to pay today, and the decision to join is yours at launch. Founding members lock $8.97 a month for life while later members pay the higher public rate.
Become a Founding Member