Jim wants a simple to use photo app for his mobile phone. Leo says that Snapseed is a great option for iOS or Android. These days, it's a lot easier to use mobile phones to do the photo post processing because the apps are so easy.
If he wants to get a similar app for desktop, Photoshop is overkill for most users. In Google Chrome, there are a lot of extensions and plugins, like Photo Editor by Aviary, that can be used to do photo editing. Adobe Photoshop Elements would give him about 80% of Photoshop and is much easier to use.