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: 2,844,407 (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 (239 countries, top 30 shown):

Spain Spain12.7%
United States United States11.7%
Germany Germany9.4%
China China7.5%
France France6.4%
Italy Italy6.0%
United Kingdom United Kingdom4.0%
Netherlands Netherlands3.4%
Canada Canada3.3%
Poland Poland2.6%
Brazil Brazil2.3%
Russian Federation Russian Federation2.2%
Australia Australia2.0%
India India1.6%
Argentina Argentina1.5%
Japan Japan1.1%
Mexico Mexico1.1%
Hungary Hungary1.1%
Austria Austria1.1%
Belgium Belgium1.0%
Czech Republic Czech Republic1.0%
Ukraine Ukraine0.8%
Switzerland Switzerland0.8%
Turkey Turkey0.8%
Taiwan, Province of China Taiwan, Province of China0.7%
Bulgaria Bulgaria0.7%
Romania Romania0.6%
Unknown Unknown0.6%
Chile Chile0.6%
Viet Nam Viet Nam0.5%

% of unknown IP addresses: 0.6%

Most popular versions (Top 20):

3.46.024.4%
3.44.015.4%
3.45.24.8%
3.40.14.4%
3.42.04.1%
3.39.13.0%
3.34.02.3%
3.36.01.4%
3.37.01.3%
3.41.31.3%
3.38.11.3%
3.28.01.2%
3.31.01.2%
3.33.11.1%
3.32.01.0%
3.35.01.0%
3.26.10.8%
3.30.00.8%
3.29.00.7%
1.48.00.7%

Operating systems calibre runs on

win81.7%
osx15.8%
oth2.5%