I still encounter companies downgrading to older version of IE to support their legacy applications.
https://itunes.apple.com/au/app/the-memory-app/id1182717566?...
You can download the app in iTunes, find the .ipa file and extract it to look what's inside.
Edit: also it's not the actual size that you will download on your phone. Visit the AppStore from your device and it will show you the correct size for you.
Also good for hobby projects where you just want to try out a technology without spending time on setting up the environment