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: 158,049 (those that have started calibre at least once in the last 1 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 (216 countries, top 30 shown):

United States United States16.3%
Spain Spain12.0%
Germany Germany8.6%
Italy Italy6.0%
China China5.9%
France France5.8%
United Kingdom United Kingdom4.6%
Canada Canada4.5%
Netherlands Netherlands2.9%
Poland Poland2.6%
Brazil Brazil2.4%
Russian Federation Russian Federation2.1%
Australia Australia1.9%
Argentina Argentina1.5%
Japan Japan1.2%
India India1.2%
Mexico Mexico1.0%
Austria Austria1.0%
Czech Republic Czech Republic0.9%
Belgium Belgium0.9%
Taiwan, Province of China Taiwan, Province of China0.9%
Hungary Hungary0.9%
Ukraine Ukraine0.8%
Switzerland Switzerland0.8%
Turkey Turkey0.6%
Chile Chile0.5%
Sweden Sweden0.5%
Bulgaria Bulgaria0.5%
Romania Romania0.5%
South Africa South Africa0.5%

% of unknown IP addresses: 0.1%

Most popular versions (Top 20):

3.40.132.9%
3.39.111.0%
3.38.13.5%
3.34.03.4%
3.37.03.1%
3.36.02.6%
3.35.02.0%
3.31.01.9%
3.33.11.9%
3.32.01.7%
3.28.01.5%
3.30.01.1%
3.26.11.1%
3.29.01.0%
3.23.00.9%
3.15.00.8%
1.48.00.8%
3.14.00.8%
3.27.10.8%
3.39.00.8%

Operating systems calibre runs on

win80.8%
osx15.8%
oth3.4%