Shortcuts
Recently I have been experimenting with the Shortcuts app. It is an Apple only app that allows you to make mini programs to use. They can even by activated with a Siri command. I have created three so far. You can generate QR codes, write notes, add files to Dropbox and much more.
The app is easy to use with plenty of options.

It is fairly self-explanatory to learn. It is really cool and has plenty of commands to make anything you could program.