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: 2,751,904 (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 (240 countries, top 30 shown):

Spain Spain12.4%
United States United States11.9%
Germany Germany9.5%
China China7.9%
France France6.2%
Italy Italy6.0%
United Kingdom United Kingdom4.1%
Canada Canada3.4%
Netherlands Netherlands3.0%
Poland Poland2.7%
Brazil Brazil2.5%
Russian Federation Russian Federation2.3%
Australia Australia2.0%
Argentina Argentina1.7%
India India1.5%
Japan Japan1.2%
Mexico Mexico1.1%
Hungary Hungary1.1%
Austria Austria1.0%
Czech Republic Czech Republic1.0%
Belgium Belgium0.9%
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: 0.3%

Most popular versions (Top 20):

3.40.119.5%
3.42.016.7%
3.41.36.5%
3.39.15.6%
3.34.03.1%
3.37.02.0%
3.38.12.0%
3.36.02.0%
3.31.01.8%
3.28.01.5%
3.33.11.5%
3.35.01.4%
3.32.01.4%
3.26.11.0%
3.30.01.0%
3.29.00.9%
3.23.00.9%
3.15.00.8%
3.14.00.8%
1.48.00.8%

Operating systems calibre runs on

win82.0%
osx15.4%
oth2.6%