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: 2,772,279 (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 Spain12.3%
United States United States12.0%
Germany Germany9.4%
China China7.7%
France France6.2%
Italy Italy5.8%
United Kingdom United Kingdom4.1%
Canada Canada3.3%
Netherlands Netherlands3.3%
Poland Poland2.6%
Brazil Brazil2.3%
Russian Federation Russian Federation2.2%
Australia Australia2.0%
Argentina Argentina1.6%
India India1.6%
Japan Japan1.1%
Mexico Mexico1.1%
Hungary Hungary1.1%
Austria Austria1.0%
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%
Chile Chile0.6%
Romania Romania0.6%
Unknown Unknown0.5%
Singapore Singapore0.5%

% of unknown IP addresses: 0.5%

Most popular versions (Top 20):

3.44.025.1%
3.42.07.8%
3.45.25.9%
3.40.15.3%
3.46.03.8%
3.39.13.5%
3.34.02.5%
3.43.02.1%
3.41.31.7%
3.36.01.5%
3.37.01.5%
3.38.11.4%
3.31.01.4%
3.28.01.3%
3.33.11.2%
3.32.01.1%
3.35.01.1%
3.26.10.9%
3.30.00.8%
3.29.00.8%

Operating systems calibre runs on

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