You can install ShopSuey on Chrome or FireFox:
Here's how it works on Amazon.com
On a typical search for 'Whey Protein,' we see the following with and without ShopSuey.
And on Ebay.com
When you search for 'iPhone X' on Ebay, you're usually shown a ton of sponsored products (red). ShopSuey chops those ads away.
Currently, the extension only supports Amazon.com and Ebay.com but we're working on cleaning up several other online retailers, including BestBuy, Target, and Walmart.
Frequently Asked Questions:
Does this extension record any of my data?
Absolutely not. All of the code for the extension is contained on your machine after you install it -- there is no data sent to our servers at all. The permissions requested when installing ShopSuey are required to be able to modify the actual sites themselves.
Does this cost any money to use?
Nope, ShopSuey is completely free to download and use.
How do you make money then?
We may show you price comparison options when you're on an actual product page (only if the competitors are cheaper, of course). In the event we do, we'll use our affiliate code on the link.
Isn't this just a glorified userscript?
Yes, it is.
Is the code open source?
Not really. When you download the extension, you get minified version of the full codebase. But it's not a public repo on Github or elsewhere and lacks documentation. I may get to this in the near future if people are interested.