From cashback sites to coupon aggregators , theres no shortage of money-saving opportunities for savvy shoppers . But while many of these apps are great for people who shop from their laptops or even venture into physical stores, few work as well when shopping directly from a phone.

Even so, there are a few apps that make earning deep discounts on purchases easy for mobile shoppers. And I should know Ive used them all. Often, you can stack the discounts from a few of these apps on a single purchase to multiply the savings . And if you use a rewards credit card to make the purchase? Now youre cooking with gas.

But first, a word of warning: These apps only save you money if you use them on purchases you were going to make anyway. If you get carried away chasing that rewards dragon, youre not really saving any money.

With that said, here are five tried-and-true apps that help you save money when shopping on your phone.

1. Wikibuy

Available on: iPhone , Android

Wikibuy is my favorite shopping tool thanks to several money-saving features. I started using the Wikibuy Chrome extension a few months ago to quickly see if any item I was considering purchasing could be found elsewhere for less. I use it alongside the Honey extension to run coupon codes before finalizing a purchase.

In addition to scouring the web for the best deals, Wikibuy also offers cash back on qualifying purchases and adds products Ive viewed online to a watchlist that tracks price drops. Its basically the Swiss army knife of shopping tools one thats earned me an extra $8 and change on top of the savings Ive scored so far.