Usage statistics

Usage statistics are collected whenever a user starts calibre. Every calibre installation has a unique ID, this ID remains unchanged by upgrades and even an uninstall/re-install. This ID is used to collect usage statistics. Only this ID is stored, no other identifying information is collected.

Active installs: 3,453,857 (those that have started calibre at least once in the last 60 days)

Note that installs are not users. A single user could run calibre on multiple computers. A single calibre install could be used by multiple people.

Installs by country (240 countries, top 30 shown):

United States United States12.2%
Spain Spain11.5%
Germany Germany10.9%
Unknown Unknown10.2%
Italy Italy6.1%
France France5.0%
United Kingdom United Kingdom4.4%
Canada Canada3.6%
China China3.6%
Netherlands Netherlands3.0%
Poland Poland2.5%
Russian Federation Russian Federation2.2%
Australia Australia2.0%
Brazil Brazil1.9%
India India1.2%
Austria Austria1.2%
Argentina Argentina1.1%
Hungary Hungary1.1%
Ukraine Ukraine0.9%
Czech Republic Czech Republic0.9%
Belgium Belgium0.8%
Mexico Mexico0.8%
Switzerland Switzerland0.7%
Turkey Turkey0.6%
Bulgaria Bulgaria0.5%
Japan Japan0.5%
Romania Romania0.5%
South Africa South Africa0.5%
New Zealand New Zealand0.5%
Chile Chile0.4%

% of unknown IP addresses: 10.2%%

Most popular versions (Top 20):

2.48.010.4%
2.49.09.7%
2.50.19.4%
2.47.08.6%
2.46.05.6%
2.45.03.3%
2.31.02.5%
1.48.02.2%
2.44.12.1%
2.41.01.9%
2.40.01.7%
2.38.01.5%
2.35.01.4%
2.33.01.2%
2.43.01.2%
2.12.01.1%
2.42.01.1%
2.50.01.1%
2.20.01.0%
2.30.00.8%

Operating systems calibre runs on

win83.8%
osx14.5%
oth1.7%