2. PicLab

itunes.apple.com
PicLab is another app that lets you add text to your photos. As well as text, you can also add different masks. These masks can range from shapes and borders to light leaks. The app is free to download from the iTunes app store, but does publish photos with a noticeable watermark. Purchasing the in-app upgrade for $0.99 will remove the watermark as well as giving you access to more features.