For the Freestyle Lite (not the continuous meter), I wrote my own logging app using Pythonista. I record the data in that, which is then saved in an excel file in my Dropbox.
For the Freestyle Libre (continuous meter, just got one), I export the data to csv using Abbot’s software, then process the data using a python script. I’ll be writing up my first post on this in the next week or two and will include the code.