Pocket Light Meter
This app saved my life during college. When you go into photography, you start with learning film with manual cameras. Manual cameras, like medium format at 4x5, don't have light meters built in, so most classes require you to buy a light meter. These can range from $100-$300. However, you can avoid this cost by downloading the free Light Meter app. It uses your phone camera to test the white balance and give you the correct settings for your camera. You choose the ISO that your film has set and it does the work for you to calculate the shutter speed and aperture. It does have some bugs, like freezing, and there are ads, but it's much more convenient to spend no money than dish out $100 for something you'll only use for a little while!
Download Pocket Light Meter
Glitché is one of my favorite photography apps to make abstract edits in. It gives you a ton of options to make your photo as trippy as you want. There are many different modes, such as Scan, Invert, VHS, and more. The app is $0.99, but you do have to pay additional money in order to use the full functions of the app. You can also make GIFs in this app with different effects and there are a lot of exporting options. This app has become super popular. Artists such as Gorillaz and Run the Jewels have used the app for album artwork, as well as Kim Kardashian for promoting her own app. Overall, it's a fun addition to your phone!