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: 2,855,441 (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 (237 countries, top 30 shown):

Spain Spain12.4%
United States United States11.7%
Germany Germany9.2%
China China7.8%
France France6.2%
Italy Italy6.2%
United Kingdom United Kingdom4.1%
Canada Canada3.4%
Netherlands Netherlands3.0%
Poland Poland2.8%
Russian Federation Russian Federation2.3%
Brazil Brazil2.1%
Australia Australia1.9%
Argentina Argentina1.5%
India India1.5%
Japan Japan1.2%
Hungary Hungary1.1%
Mexico Mexico1.1%
Czech Republic Czech Republic1.1%
Austria Austria1.0%
Belgium Belgium1.0%
Turkey Turkey0.9%
Ukraine Ukraine0.8%
Switzerland Switzerland0.8%
Taiwan, Province of China Taiwan, Province of China0.8%
Unknown Unknown0.7%
Romania Romania0.6%
Bulgaria Bulgaria0.6%
Chile Chile0.5%
Viet Nam Viet Nam0.5%

% of unknown IP addresses: 0.7%

Most popular versions (Top 20):

4.2.012.1%
4.5.010.3%
4.3.09.5%
4.1.05.7%
4.4.05.5%
3.48.05.1%
3.46.04.6%
3.44.03.3%
3.40.12.5%
3.42.02.1%
3.39.11.9%
3.47.11.7%
3.34.01.6%
4.0.01.4%
3.36.00.9%
3.37.00.9%
3.31.00.8%
3.38.10.8%
3.28.00.8%
3.45.20.8%

Operating systems calibre runs on

win82.3%
osx15.0%
oth2.7%