This app connects a smartphone or tablet with the Calliope mini and flashes hex files or blobs from webviews of the editors to the Calliope mini.
You can just get it directly from the Apple AppStore.
If you feel adventurous or want to help out feel free to get the latest code via git and build it yourself.
git clone git://github.com/calliope-mini/calliope-mini-flash-app.git