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: 366,877 (those that have started calibre at least once in the last 3 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 (228 countries, top 30 shown):

United States United States14.4%
Spain Spain12.3%
Germany Germany8.7%
China China7.1%
Italy Italy6.0%
France France5.8%
United Kingdom United Kingdom4.2%
Canada Canada4.0%
Netherlands Netherlands2.9%
Poland Poland2.7%
Brazil Brazil2.5%
Russian Federation Russian Federation2.2%
Australia Australia2.1%
Argentina Argentina1.5%
India India1.3%
Japan Japan1.3%
Mexico Mexico1.1%
Austria Austria1.0%
Czech Republic Czech Republic0.9%
Hungary Hungary0.9%
Belgium Belgium0.9%
Taiwan, Province of China Taiwan, Province of China0.9%
Ukraine Ukraine0.8%
Switzerland Switzerland0.8%
Turkey Turkey0.7%
Bulgaria Bulgaria0.6%
Chile Chile0.5%
South Africa South Africa0.5%
Sweden Sweden0.5%
Romania Romania0.5%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

3.40.132.8%
3.39.110.5%
3.34.03.5%
3.38.13.4%
3.37.03.0%
3.36.02.6%
3.35.02.0%
3.31.02.0%
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%
3.27.10.8%
3.14.00.8%
2.85.10.7%

Operating systems calibre runs on

win81.6%
osx15.4%
oth2.9%