Usage statistics

Usage statistics are collected whenever a user starts calibre. Every calibre installation has a randomly generated 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. And no collected information is ever shared with any third party.

Active installs: 861,307 (those that have started calibre at least once in the last 8 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 (232 countries, top 30 shown):

United States United States13.4%
Spain Spain12.9%
Germany Germany8.4%
Italy Italy6.2%
France France6.1%
China China5.5%
United Kingdom United Kingdom4.3%
Canada Canada4.3%
Netherlands Netherlands3.1%
Poland Poland2.7%
Brazil Brazil2.6%
Australia Australia2.1%
Russian Federation Russian Federation1.9%
India India1.7%
Argentina Argentina1.7%
Japan Japan1.3%
Mexico Mexico1.3%
Belgium Belgium1.0%
Hungary Hungary1.0%
Czech Republic Czech Republic0.9%
Austria Austria0.9%
Turkey Turkey0.8%
Switzerland Switzerland0.8%
Taiwan, Province of China Taiwan, Province of China0.8%
Ukraine Ukraine0.7%
Chile Chile0.6%
Hong Kong Hong Kong0.5%
Singapore Singapore0.5%
Romania Romania0.5%
Bulgaria Bulgaria0.5%

% of unknown IP addresses: 0.0%

Usage share by major version

538.9%
435.3%
318.0%
25.6%
11.3%
01.0%

Most popular versions (Top 20):

5.3.026.8%
4.23.08.8%
5.2.06.4%
3.48.03.7%
4.22.03.3%
5.0.12.8%
4.13.02.5%
5.1.02.4%
4.21.01.9%
4.20.01.7%
4.19.01.5%
4.18.01.5%
4.12.01.5%
4.17.01.4%
3.46.01.2%
4.15.01.2%
4.5.01.2%
4.8.01.2%
3.44.01.0%
3.40.10.9%

Operating systems calibre runs on

win81.7%
osx14.3%
oth4.0%