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: 2,741,818 (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 (238 countries, top 30 shown):

Spain Spain12.1%
United States United States11.9%
Germany Germany9.5%
China China7.8%
France France6.3%
Italy Italy5.9%
United Kingdom United Kingdom4.1%
Canada Canada3.3%
Netherlands Netherlands3.1%
Poland Poland2.7%
Brazil Brazil2.4%
Russian Federation Russian Federation2.2%
Australia Australia2.0%
Argentina Argentina1.7%
India India1.5%
Japan Japan1.1%
Mexico Mexico1.1%
Hungary Hungary1.1%
Austria Austria1.0%
Czech Republic Czech Republic1.0%
Belgium Belgium1.0%
Ukraine Ukraine0.8%
Turkey Turkey0.8%
Switzerland Switzerland0.8%
Taiwan, Province of China Taiwan, Province of China0.8%
Bulgaria Bulgaria0.6%
Chile Chile0.6%
Romania Romania0.6%
South Africa South Africa0.5%
Hong Kong Hong Kong0.5%

% of unknown IP addresses: 0.5%

Most popular versions (Top 20):

3.42.017.7%
3.44.014.2%
3.40.17.9%
3.41.35.7%
3.39.14.3%
3.34.02.8%
3.43.02.5%
3.37.01.7%
3.36.01.7%
3.38.11.7%
3.31.01.6%
3.28.01.4%
3.33.11.3%
3.32.01.3%
3.35.01.2%
3.26.10.9%
3.30.00.9%
3.29.00.8%
3.23.00.8%
3.15.00.8%

Operating systems calibre runs on

win81.9%
osx15.5%
oth2.6%