While iPad and iPhone apps are usually pretty inexpensive individually, it'll soon add up if you're buying an app or two a week. There are ways to get paid apps for free, though, and here, we're going to show you how.

Read: Is it possible to get a free iPad? The truth about free iPad scams

How to find out when apps are free or on offer in iTunes

With millions of apps in the App Store, developers are constantly trying to find ways to up their visibility, and one of those ways is through price-drop promotions. There are some apps and websites that let you find out what paid apps are currently on offer or cheaper than usual.

The best we've found is AppZapp, which is well designed and offers details of apps that are on sale or are free at the current time. You can filter the lists to show only the type of apps you're interesting, or only the apps for the device you own (an iPad, iPhone or Mac), and you can also choose to show only free apps.

The AppZapp app also shows you star ratings for apps, so you'll know whether they're even worth downloading. Other similar apps we've used to find free apps in the past have lacked ratings and reviews, which meant we found ourselves downloading free apps that were truly rubbish.

App Shopper is another good place to find apps that have been reduced in price. If you head over to AppShopper.com, you can see what's new in the iTunes Store in a frequently updated list, as well as the top 200 and, best of all, price drops.

If you go to the What's New tab and then click Popular, Free and Price Drops in the filter menu, you'll see all of the popular apps that have recently been made free.

There are other apps out there, including FreeAppMagic Daily, that offer similar services but the quality is significantly less impressive.

One thing to note about all of these free app offers is that it's still possible that there will be in-app purchases available within the apps.

We've rounded up links to all our iPhone tips and tutorials here: iPhone tips and tutorials, everything you need to know

How to get paid apps for free: Apple's Free App of the Week

Every week, Apple chooses an app as its App of the Week. They're usually pretty impressive apps that will cost you a pound or two when they're not in the promotion so it's well-worth keeping an eye out on the iOS App Store each week to see what's on offer.

You'll spot Apple's free App of the Week on the iTunes Store home page.

How to get paid apps for free: Starbucks Pick of the Week codes

Starbucks has a Pick of the Week promotion that offers a free download on iTunes each week.

All you need to do is visit a Starbucks each week (the promotion changes every Tuesday) and pick up a Pick of the Week card. They can usually be found on the counter where you pick up your coffee order.

On the back of the card you'll find a code that you can type into iTunes to start downloading your free Pick of the Week. You'll find that they include books, music, apps and games.

Alternatively, you can use the Starbucks iOS app while connected to Starbucks WiFi to get the current Pick of the Week.