A simple metric from #FDroid #metrics data: app downloads per week. Start with data from 1 of 2 servers for f-droid.org: http02, add hits for paths ending in ".apk". That gave about 2 million. Multiply by 18 (fronters + mirrors) and get ~36 mil app downloads a week.

import requests
hits = 0
r = requests.get(f'https://fdroid.gitlab.io/metrics/http03.fdroid.net/2025-05-26.json')
data = r.json()
for path in data['paths']:
if path.endswith('.apk'):
hits += data['paths'][path]['hits']
print('APKs', hits)

https://forum.f-droid.org/t/experiment-in-f-droid-org-metrics/32454