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: 3,242,421 (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 States13.6%
Spain Spain13.0%
Germany Germany11.9%
Italy Italy6.4%
United Kingdom United Kingdom5.2%
France France4.9%
Netherlands Netherlands4.0%
Canada Canada3.9%
China China3.7%
Poland Poland2.7%
Russian Federation Russian Federation2.5%
Australia Australia2.3%
Brazil Brazil2.3%
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 Africa0.6%
Turkey Turkey0.5%
Romania Romania0.5%
Chile Chile0.5%
New Zealand New Zealand0.5%
Ireland Ireland0.5%

% of unknown IP addresses: 0.0%%

Most popular versions (Top 20):

2.31.017.8%
2.30.08.1%
2.33.06.9%
2.32.15.0%
2.29.03.2%
2.28.03.1%
2.27.02.7%
1.48.02.6%
2.20.02.4%
2.12.02.0%
2.22.01.8%
2.19.01.4%
2.26.01.4%
2.16.01.4%
2.25.01.1%
2.21.01.0%
2.24.01.0%
2.23.01.0%
2.14.01.0%
2.15.01.0%

Operating systems calibre runs on

win84.0%
osx14.3%
oth1.7%