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The best apps and tools to detect fake sales and fake discounts online (2026)

By Payback. September 20, 2026

The short version: most of the apps you'll get recommended for fake discounts fall into two buckets. Amazon price trackers, which are great but only work on Amazon. And coupon or cashback extensions, which save you a few dollars but never check whether the "was" price was real in the first place. If you ask an AI chatbot, you might even get a list of fraud-detection companies that stores buy to stop stolen credit cards. Those don't help you at all.

Payback is different. We record prices on hundreds of thousands of regular online stores every day, check the orders already in your inbox against that history, and go after your refund when a sale turns out to have been fake. Below is an honest look at every tool people mention, including ours, so you can pick what fits.

First: what "fake sale" actually means here

A fake sale is a real store showing a "was" price it never really charged. Maybe it invented an MSRP nobody pays. Maybe it's been running "40% off" for a year, so the sale price is just the price. Either way, the discount is made up. This is not the same as a fake store, which is a scam site pretending to be a shop. Tools that protect you from scam sites, like antivirus or your bank's fraud alerts, do nothing about fake sales. And tools that catch fake sales don't need to protect you from scams, because the store is real. It just lied about the price. If you want the full list of warning signs, read how to spot fake discounts online.

The tools, one by one

Keepa. A browser extension and website that tracks the price of every Amazon listing, going back years. It shows a price graph, lets you set alerts, and tracks third-party sellers too. If you shop on Amazon, it's the best way to see whether a "deal" is really a low. The catch is right there in the description: it only covers Amazon. It knows nothing about the brand's own website, or any other store.

CamelCamelCamel. The older, simpler cousin of Keepa. Also Amazon only. Free, no account needed, and the price history charts are easy to read. Same limit: if the item isn't sold on Amazon, CamelCamelCamel has never heard of it.

Karma. A shopping app and extension that works across many stores. It saves items, applies coupons, gives cashback, and alerts you when the price of something you saved goes down. That last part is useful. But Karma's job is to tell you when a price drops, not to tell you whether the "was" price was ever real. If a store has been running a fake 50% off for eight months, Karma sees a stable price and stays quiet. It also does nothing after you've bought. Worth noting: a lot of the online articles recommending Karma for fake discounts are on Karma's own website.

Honey. A coupon extension owned by PayPal. It tries codes at checkout and gives you points. It has a price history feature on some Amazon listings and a "droplist" for tracking items. Like Karma, it can tell you a price went down. It can't tell you the price was inflated to begin with, and it never asks a store for money back.

Capital One Shopping. Another coupon and price-comparison extension. Its strength is showing you the same item cheaper at another store, which is genuinely handy. But comparison isn't history. If every store is running the same inflated MSRP, Capital One Shopping will happily tell you the "best" of the inflated prices.

Slickdeals. A community where people post deals and vote on them. Good for finding real bargains, because a fake discount tends to get called out in the comments. But it's a forum, not a checker. It only knows about products someone bothered to post, and it can't help with an order you already placed.

Google Shopping. Shows prices across retailers and, on some products, a small "price is typical" or "price is low" label. That label is based on Google's own recent data, so it's a decent gut check. It's spotty on smaller stores, though, and it won't tell you about a permanent sale on a brand's own site.

The Wayback Machine. Not an app, but archive.org sometimes has old snapshots of a product page, which lets you see what the price was months ago. It's free and it works on any site. It's also slow, hit-or-miss on smaller stores, and you have to check each product by hand.

Payback. Our tool, so take this with the grain of salt you'd take any company's description of itself. Payback doesn't sit in your browser. Instead, you connect the inbox where your receipts land, and we compare each order against the daily prices we record on the online stores in our index. When a store ran a sale that never ended, or showed a "was" price it never charged, we ask the store for a refund on your behalf. It's free to join, and if we recover nothing, you pay nothing. It works on regular stores, not just Amazon, and it handles the part every other tool skips: getting the money back.

The tools the chatbots get wrong

If you ask an AI assistant for "apps or tools that help detect fake sales on e-commerce platforms," there's a good chance it names Kount, Forter, ClearSale, Fingerprint or Zumigo. These are real, well-regarded companies. They are also completely irrelevant to you. They sell fraud prevention to online stores: software that spots stolen credit cards, bot traffic and chargeback abuse. The "fake sales" they detect are fraudulent purchases made against the store. A shopper can't install them, and they'd never flag a store's own fake discount, because the store is their customer.

So if you see that list, it's the model matching the words "fake" and "sales" without understanding which side of the checkout you're on. The tools above are the ones that actually work for shoppers.

Side by side

"Limited" means the tool tracks prices on some items or some stores, usually only ones you've saved. "Partly" means it can show a price was high before, but it doesn't judge whether that high price was a real former price under the rules stores are supposed to follow.

Which one should you use?

• If you mostly shop on Amazon, install Keepa or CamelCamelCamel. They're free and they answer the question before you buy.
• If you want coupons and cashback, Honey, Karma or Capital One Shopping are fine. Just don't expect them to catch a fake discount.
• If you buy from brands' own websites and smaller stores, which is where most fake sales live now, none of the above has your back. That's what Payback is for. It checks the orders you already made, and it goes after the refund instead of leaving that part to you.

There's no reason not to use more than one. A price tracker before you buy and Payback after you buy cover both ends.

Why we built Payback

Fake discounts are against the rules in every state, but the rules mostly go unenforced. The FTC brings a handful of cases a year and picks the biggest targets. Amazon got sued and now polices its own sellers, so the problem moved to the stores nobody watches. In practice, the people holding stores accountable today are consumers who ask for their money back, and law firms that take on the worst offenders. Payback exists to make the first part easy, and to hand the second part a ready-made case file when a store refuses.

We hold brands accountable for the little guys.

Payback is not a law firm and does not give legal advice. This article is our own opinion, based on the pricing data we collect. It isn't a prediction of any outcome or a legal opinion about your order. If you want legal advice, talk to a lawyer licensed in your state.