I develop apps independently aside from working as an iOS Developer full time. I have been developing apps for my phones that I owned: iPhones and Galaxy Notes.
My most proud, developed app is DAILY NOTES PLANNER. It is, simply put, notes for your calendar, where you can type plain notes inside every date. This simple interface to just jot down your notes by date and exactly knowing how to reference them without the trouble of organizing your notes is the core functionality of this application. I used paper planner extensively in my middle school and high school in Ridgewood, NJ and later when I wanted an app for it, I could not find the app simple enough that allowed me to focus on my work rather than focusing on excessive, not-so-considerate user interface. So I created one, and I have been using it very pleasantly as a digital planner that I carry around everywhere I go. Daily Notes Planner has 2 versions in iOS App Store: Daily Notes Planner and Daily Notes Planner 2. It has a MacBook version in Mac App Store called Daily Notes Planner. You can sync your notes via iCloud to multiple devices among these three apps.
Daily Notes Planner (iOS): https://itunes.apple.com/us/app/daily-notes-planner/id705474849?mt=8
Daily Notes Planner 2 (iOS): https://itunes.apple.com/us/app/daily-notes-planner-2/id1317135517?mt=8
Daily Notes Planner (Mac): https://itunes.apple.com/us/app/daily-notes-planner/id1336590353?mt=12
Daily Notes Planner (Android): https://play.google.com/store/apps/details?id=com.inho.hwang.dailynotesplanner
My apps are published in GooglePlay (Android) and iOS and Mac App Stores.
All apps are published under the name "Inho Hwang", and you can search it to find my apps
My iOS and Mac Apps: https://itunes.apple.com/us/developer/inho-hwang/id687669700
My Android Apps: https://play.google.com/store/apps/developer?id=Inho+Hwang&hl=en