Online shopping has made it easier than ever to compare prices, but with deals changing by the hour, it can be hard to know if you're actually getting the best price. That's where price-tracking apps come in. Digital tools keep an eye on the cost of items you want to buy and alert you the moment a price drops. Understand the top apps worth installing if you want to stop leaving money on the table.
1. Honey – Coupons and a Built-In Price Watch
PayPal Honey is a no-fee browser extension that works quietly in the background while you shop. When you reach the checkout page on any of the 30,000+ supported stores, it automatically searches for and tests coupon codes, then applies the one that saves you the most money (source). It's available for Chrome, Firefox, Safari, Opera, and Edge, so it fits into whatever browser you already use.
Honey also has a feature called Droplist that turns it into more than just a coupon finder. You save items you want to buy to your Droplist, and Honey watches those products for price changes. When a price drops, Honey sends you a notification. This comes in handy on sites like Amazon, Target, and Walmart, where prices can change without any warning. On top of that, Honey members can earn PayPal Rewards points on qualifying purchases at participating stores, which layers extra savings on top of any coupon codes already applied (source).
2. CamelCamelCamel – Gaze Into Amazon's Pricing History
If most of your online shopping happens on Amazon, CamelCamelCamel is worth adding to your toolkit. This completely no-fee tool tracks product prices on Amazon and displays a chart showing how those prices have moved — whether you want to see the last 30 days, 90 days, one year, or the full history since the item was first listed (source). Looking at that data makes it much easier to tell whether a so-called sale is actually a good deal.
You can set up email alerts for any product, choosing the exact price you're willing to pay, and CamelCamelCamel will notify you when the product hits that number. The tool also lets you track prices across three seller types: Amazon directly, new third-party sellers, and used third-party sellers (source). For even faster access, the Camelizer browser extension for Chrome and Firefox adds a price history chart right on the Amazon product page, so you never have to open a separate tab to check (source).
3. Keepa – Detailed Price Data Without Leaving Amazon
Keepa is another powerful tool for Amazon shoppers, and like CamelCamelCamel, it brings price history directly to your browser. Once installed as an extension — available for Chrome, Firefox, and Microsoft Edge — Keepa automatically adds price history charts to Amazon product pages as you browse (source). There's no copying links or switching tabs; the chart simply appears on the page.
What sets Keepa apart is the range of alerts it supports. You can set a target price for any product and receive a notification when that price is reached, and you can also set alerts specifically for Amazon Lightning Deals — short-window sales that often disappear within hours (source). Keepa also supports multiple Amazon marketplaces around the world, which is a bonus for shoppers who sometimes buy from international sellers. For anyone who buys frequently from Amazon and wants granular pricing data, Keepa is hard to beat.
4. Rakuten – Earn Cash Back on Purchases You Were Going to Make Anyway
Rakuten works differently from the rest of the apps on this list. Rather than tracking price history, it focuses on giving you a percentage of your purchase back as cash after the sale. Rakuten partners with more than 3,500 stores, ranging from large national retailers to smaller online brands (source).
The process is simple: before shopping, you start your trip from the Rakuten website, app, or browser extension, click through to the store you want, shop as normal, and Rakuten credits cash back to your account after the purchase is confirmed. Rewards can be redeemed as a PayPal deposit, a paper check, or American Express Membership Rewards Points — a useful perk for anyone who collects travel points (source). The main thing to be aware of is that Rakuten pays out on a quarterly schedule, so there is a waiting period before you see the money (source).
5. Karma – Price Tracking That Follows You Across the Whole Web
Karma is a no-fee browser extension and app that watches prices at more than 100,000 online retailers (source). When you find something you want but aren't ready to pay full price, you save it in Karma and the app monitors the price for you around the clock. The setup takes only seconds.
The moment a price drops, or an out-of-stock product becomes available again, Karma sends you a real-time alert so you can act before the deal disappears. Like Honey, Karma also applies coupon codes automatically at checkout and offers cash back at participating stores. In April 2026, Karma launched an intelligent shopping agent designed to track prices in real time and surface working coupon codes automatically, making it even easier to catch the right moment to buy (source). For shoppers who don't stick to a single retailer, Karma's wide coverage makes it one of the most flexible options available.
The Smartest Move: Use More Than One
No single app wins in every situation, and the good news is that most of them can run side by side without any conflict. For Amazon purchases, CamelCamelCamel and Keepa both offer detailed price histories that help you decide whether a deal is worth taking. Honey is best for catching coupon codes across a broad range of stores, while Rakuten earns you cash back on purchases you were already planning to make.
Karma fills the gap for shoppers who browse widely and want one app watching prices everywhere at once. Using two or three of these tools together gives you the best possible coverage, no matter where you shop. Best of all, each one is complimentary to use and does most of its work quietly in the background — so the savings come without much extra effort on your part.