One-click tracking
Open the extension on any supported product page. PriceSpy captures the product name, price and image automatically. No manual entry.
Browser extension · Shopping
Track a price. Get told the moment it drops.
PriceSpy watches product prices across Amazon, eBay, Walmart, Taobao, Tmall and JD.com. Click the icon on a product page and it starts tracking. A chart shows the price history, a desktop alert fires when the price hits your target, and a buy-or-wait signal tells you whether today is actually a good day to buy.
Version 1.0.3 · Free plan tracks 10 products · No account required
What it does
A price tracker is only useful if it answers one question without effort: is this a good price, right now?
Price history charts
An interactive chart of every price PriceSpy has recorded for that product, so you can see at a glance whether the current number is high or low for this item.
Target price alerts
Set the price you are willing to pay. A desktop notification fires the moment the product reaches it, and stays visible until you acknowledge it.
Buy or wait
A signal derived from the price history: green for buy, yellow for wait, red for too expensive relative to its own average.
Multi-currency
Detects and handles prices in USD, CNY, EUR and more, so a product tracked on a US storefront still reads correctly if you shop in another currency.
Automatic checks
Prices are re-checked periodically in the background using the browser's alarm scheduling. You do not need to keep a tab open.
The buy-or-wait signal
Three states, based on how the current price compares with the history recorded for that same product.
Buy nowThe price is at or near its lowest recorded point.
WaitThe price may drop further; it is not at the bottom of its range.
Too expensiveThe price is above the average PriceSpy has recorded for this product.
Supported stores
Open a product page on any of these and the extension recognises it.
- Amazon — US, UK, DE, FR, IT, ES, NL, JP, CN
- eBay
- Walmart
- Taobao
- Tmall
- JD.com
Privacy
A price tracker sees every product page you open, which is exactly why the data model matters.
Data stays on your device
Tracked products, price history and preferences live in the browser's extension storage. PriceSpy does not collect, transmit or sell personal information.
No account, no tracking, no ads
There is nothing to sign up for. The extension works immediately after installation, and there is no analytics or advertising layer.
Narrow permissions
Access is limited to the storefronts it supports, and the current tab is only read when you click the extension icon to start tracking.
Permissions, and why each one exists
What the manifest requests, and what it is used for.
| Permission | Why it is needed |
|---|---|
storage | Store tracked products, price history and preferences locally on your device. |
notifications | Show price drop alerts when a tracked product reaches your target price. |
alarms | Schedule periodic background price checks for your tracked products. |
activeTab | Access the current product page only when you click the extension icon to start tracking. |
scripting | Inject content scripts into supported storefront pages to extract the product price. |
Questions
What people ask before installing.
Which stores does PriceSpy support?
Amazon (US, UK, DE, FR, IT, ES, NL, JP and CN storefronts), eBay, Walmart, Taobao, Tmall and JD.com. Open a product page on any of them and the extension captures the product name, price and image.
Is PriceSpy free?
Yes. The free plan tracks up to 10 products with the full feature set: history charts, drop alerts and the buy-or-wait indicator. No account is required and there is nothing to sign up for.
Where is my tracked product data stored?
On your own device, in the browser's extension storage. PriceSpy does not collect, transmit or sell personal information, and it has no accounts, no tracking and no ads.
How does the buy-or-wait indicator work?
It compares the current price against the price history PriceSpy has recorded for that product. Green means the price is at or near its lowest, yellow means it may drop further, and red means it is above the average.
Do I have to keep the browser open for price checks to run?
No. PriceSpy schedules background checks with the browser's alarm API, so tracked prices are refreshed periodically without you keeping a tab open. Notifications stay visible until you dismiss them.
Is PriceSpy affiliated with Amazon, eBay or Walmart?
No. PriceSpy is an independent extension built by Haimo. It reads publicly visible product pages in your own browser and is not affiliated with, endorsed by, or connected to any of the stores it supports.