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Android: Checking out some effects
The Effects tool gives you filtering options similar to what you might find on Instagram. You can select from a number of effects and when you tap on an option you will see a preview of that appear as the photo changes. I personally don't use this tool much.
Android: Frames are a fun way to edit a photo
Frames lets you customize the border of the photo with options such as wooden, airmail, grunge, and montage. These can be fun at times and I have edited photos using this tool.
Android: Lots of touchup tools on the HTC One
When you tap on Retouch several options will appear, giving you a Photoshop Lite experience. The available tools actually are a bit dynamic too and will change depending on the photo you are viewing. For example, if someone photo bombed you then an option to remove that person may appear. Unfortunately, there is not much manual control over this option.
Tools available to you with Retouch include skin smoothing, lighting, face contour, eye enhancer, red eye removal, eye brightening, and anti-shine. As you can see most of these are focused on adjusting photos of people.