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: 704,118 (those that have started calibre at least once in the last 7 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 (231 countries, top 30 shown):

United States United States13.1%
Spain Spain12.4%
Germany Germany9.1%
China China7.5%
France France6.0%
Italy Italy6.0%
United Kingdom United Kingdom4.1%
Canada Canada3.8%
Netherlands Netherlands3.0%
Poland Poland2.7%
Brazil Brazil2.4%
Russian Federation Russian Federation2.3%
Australia Australia2.2%
Argentina Argentina1.5%
India India1.5%
Japan Japan1.2%
Mexico Mexico1.0%
Austria Austria1.0%
Hungary Hungary1.0%
Czech Republic Czech Republic1.0%
Belgium Belgium1.0%
Ukraine Ukraine0.8%
Taiwan, Province of China Taiwan, Province of China0.8%
Switzerland Switzerland0.8%
Turkey Turkey0.7%
Bulgaria Bulgaria0.6%
Chile Chile0.5%
South Africa South Africa0.5%
Romania Romania0.5%
Hong Kong Hong Kong0.5%

% of unknown IP addresses: 0.1%

Most popular versions (Top 20):

3.40.133.5%
3.39.19.8%
3.34.03.5%
3.38.13.2%
3.37.02.9%
3.36.02.6%
3.31.02.0%
3.35.01.9%
3.33.11.8%
3.32.01.7%
3.28.01.6%
3.30.01.2%
3.26.11.1%
3.29.01.0%
3.23.00.9%
3.15.00.9%
3.14.00.8%
3.27.10.8%
1.48.00.8%
3.22.10.7%

Operating systems calibre runs on

win82.0%
osx15.3%
oth2.7%