When you are thinking about redecorating a room, it's easy to get carried away with paint pot testers and Pinterest pins.  I came across this free app, Paint Tester,  that allows you to test colours using a photo of your room.  You can select just one wall or do the whole room. It's simple, cost-effective and fun!

Here is the original photo:

Here are a few examples of paint colours and how different they make the room look.

You can even change the shade of colour by playing with the brightness!