Get the Best Deals Online with Price Comparison Add-ons

Whether you are shopping online for books, software, gadgets or anything else, you probably know that comparison shopping engines can save you a lot of money. Just type the name of an item that you are looking to buy online and these sites will instantly compare the price of that item across all the different online stores so you always get the best deal.

See: Download Free Amazon Books

Compare Prices of Items in Real-Time

If you shop online quite frequently, you should try Invisible Hand — an excellent extension for Firefox and Chrome that will not only help you find the best deal on the Internet for any product but will even save you a trip to the price comparison site.

It works like this. Let’s say you are on to buy a Wi-Fi router. Invisible Hand, working in the background, will automatically recognize that you are on a shopping website and it will immediately start fetching prices of that same item from all the other online stores.

If that item is available for less on another shopping website, that information will be highlighted prominently in a yellow bar so you are unlikely to miss the deal. The prices from all other vendors are displayed in a neat drop-down so you know where to go incase that product is out of stock on the current site (which, in this case, is

And other than popular shopping websites, Invisible Hand can also display price notifications directly in Google if your search query matches a product name (like “buy iPod Touch”).

Are you getting the best deal?

Invisible Hand works in real-time without you having to do anything. This may also help in those “rare” situations when you are about to complete a purchase and suddenly there’s a price drop on another shopping website. If you have the add-on, it will automatically catch that fluctuation.

Related: Which Amazon Site Should You Use for Buying Books

Watch this quick screencast to know how Invisible hand works in your browser:

The algorithm only takes the item price into consideration so you’ll have to manually compare the shipping and handling charges to find the best “overall” deal.

Invisible Hand work with all popular online retailers in US and UK including Amazon, Wal-Mart, and even eCampus (for college textbooks).

Amit Agarwal

Amit Agarwal

Google Developer Expert, Google Cloud Champion

Amit Agarwal is a Google Developer Expert in Google Workspace and Google Apps Script. He holds an engineering degree in Computer Science (I.I.T.) and is the first professional blogger in India.

Amit has developed several popular Google add-ons including Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory


Awards & Titles

Digital Inspiration has won several awards since it's launch in 2004.

Google Developer Expert

Google Developer Expert

Google awarded us the Google Developer Expert award recogizing our work in Google Workspace.

ProductHunt Golden Kitty

ProductHunt Golden Kitty

Our Gmail tool won the Lifehack of the Year award at ProductHunt Golden Kitty Awards in 2017.

Microsoft MVP Alumni

Microsoft MVP Alumni

Microsoft awarded us the Most Valuable Professional (MVP) title for 5 years in a row.

Google Cloud Champion

Google Cloud Champion

Google awarded us the Champion Innovator title recognizing our technical skill and expertise.

Email Newsletter

Sign up for our email newsletter to stay up to date.

We will never send any spam emails. Promise.