Twitter analytics estimates the gender ratio of your followers, but it doesn't tell you about those you follow--your Twitter "friends"--and it doesn't let you analyze other people's friends and followers. Neither does it notice gender-nonbinary users.
In June 2016 I've deployed it temporarily for public use at proporti.onl.
Read my article about this code: "72% Of The People I Follow On Twitter Are Men."
This script requires Python 2.7, and the packages listed in requirements.txt.
python2.7 -m pip install -r requirements.txt
Pass a Twitter username to analyze the user's friends and followers:
python2.7 analyze.py jessejiryudavis
From the repository root directory:
python2.7 -m unittest discover -v
Start a Flask server:
python2.7 server.py 80