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: 3,359,952 (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 (239 countries, top 30 shown):

United States United States13.5%
Spain Spain13.2%
Germany Germany12.1%
Italy Italy6.5%
United Kingdom United Kingdom5.2%
France France5.1%
Netherlands Netherlands4.0%
Canada Canada3.9%
China China3.8%
Poland Poland2.6%
Russian Federation Russian Federation2.4%
Brazil Brazil2.3%
Australia Australia2.3%
India India1.3%
Argentina Argentina1.3%
Austria Austria1.3%
Ukraine Ukraine1.1%
Hungary Hungary1.0%
Czech Republic Czech Republic1.0%
Belgium Belgium1.0%
Mexico Mexico0.9%
Switzerland Switzerland0.7%
Japan Japan0.6%
Bulgaria Bulgaria0.6%
South Africa South Africa0.5%
Romania Romania0.5%
Chile Chile0.5%
Turkey Turkey0.5%
New Zealand New Zealand0.5%
Ireland Ireland0.5%

% of unknown IP addresses: 0.0%%

Most popular versions (Top 20):

2.31.012.1%
2.35.011.1%
2.33.09.4%
2.34.05.1%
2.32.13.9%
2.36.03.5%
2.30.02.7%
1.48.02.5%
2.20.02.0%
2.28.02.0%
2.27.01.9%
2.12.01.7%
2.22.01.5%
2.19.01.2%
2.29.01.2%
2.16.01.2%
2.26.01.0%
2.21.00.8%
2.14.00.8%
2.15.00.8%

Operating systems calibre runs on

win84.1%
osx14.2%
oth1.7%