No data leaves your browser. Ever.
Product detection runs on your device using Chrome’s built-in AI. Searches happen inside a hidden tab in your own browser. There is no NanoPrice backend.
Buy it.
Just not for that price.
NanoPrice reads the product on your screen with on-device AI, scans Google Shopping, and shows you who sells it cheapest. Nothing ever leaves your browser.
On-device AI · MIT licensed · No account
NanoPrice
Adidas Samba OG
4 offers
- Best
JD Sports Canada
adidas Originals Samba OG men
$130-27%$95.00 SVP Sports
WMNS Samba OG men sneakers
$130-19%$104.99Adidas Canada
Samba OG Shoes M9 / W10, Unisex Lifestyle
$130.00Foot Locker Canada
Women’s Samba OG
$130.00
Three clicks between you and the lower price.
Find what you want
Open any product page — Amazon, Best Buy, JD Sports, wherever you already shop.
Hit the price tag
NanoPrice reads what’s on screen and compares it across stores. No accounts, no waiting.
Buy it for less
Click through to the seller with the lowest price. We never get between you and the cart.
On-device AI
Your browsing never leaves your browser.
NanoPrice uses Chrome’s built-in Prompt API to identify the product on your screen. The search runs in a hidden tab inside your own browser. There is no backend to send it to.
your-browser/ shop / adidas-samba-og
N
- STEP 01
Your screen
Product page
- STEP 02
On-device AI
Chrome Prompt API
- STEP 03
Hidden tab
Google Shopping
- STEP 04
Cheapest offer
Right back to you
Nothing crosses this window
If Google Shopping indexes it,
NanoPrice surfaces it.
We don’t maintain a list of partner stores. NanoPrice searches Google Shopping in a hidden tab and shows whichever retailers come back with the product.
AmazonWalmartBest BuyTargeteBayCostcoNeweggAppleB&HAdoramaAmazonWalmartBest BuyTargeteBayCostcoNeweggAppleB&HAdoramaAmazonWalmartBest BuyTargeteBayCostcoNeweggAppleB&HAdorama
JD SportsFoot LockerNikeAdidasZaraH&MIKEAEtsyWayfairCrate & BarrelJD SportsFoot LockerNikeAdidasZaraH&MIKEAEtsyWayfairCrate & BarrelJD SportsFoot LockerNikeAdidasZaraH&MIKEAEtsyWayfairCrate & Barrel
A glimpse of who typically comes back. Actual results depend on what Google Shopping returns for the product on your screen.
Quietly on your side.
Loudly out of your data.
We built NanoPrice the way we’d want a shopping tool to behave around us.
No accounts, no telemetry, no ads.
Open source under MIT. We don’t collect, store, or sell anything because there’s nothing to collect it with.
Open about how it works.
The whole extension is on GitHub. Read it, fork it, file an issue.
Questions, answered.
- What is NanoPrice?
- NanoPrice is a free, open-source Chrome extension that reads the product on your screen with on-device AI, searches Google Shopping, and shows you which store sells it cheapest.
- Does NanoPrice send my browsing data anywhere?
- No. Product detection runs on your device using Chrome’s built-in AI, and the price search runs in a hidden tab inside your own browser. There is no NanoPrice backend, no accounts, and no telemetry.
- What do I need to run NanoPrice?
- Chrome 138 or newer with on-device AI (the built-in Prompt API). No account or sign-up is required.
- How much does NanoPrice cost?
- NanoPrice is completely free and open source under the MIT license.
- Which stores does NanoPrice compare?
- NanoPrice doesn’t maintain a fixed list of partner stores. It searches Google Shopping and surfaces whichever retailers return the product — from Amazon, Walmart, and Best Buy to JD Sports, Nike, and IKEA.
- Does NanoPrice get between me and the store?
- No. NanoPrice links you straight to the seller with the lowest price — it never sits between you and the cart.
- Is NanoPrice open source?
- Yes. The entire extension is on GitHub under the MIT license. You can read the code, fork it, or file an issue.
Pay what it actually costs.
Free, no account, no telemetry. MIT licensed. Requires Chrome 138+ with on-device AI.