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: 3,193,109 (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):

United States United States13.5%
Spain Spain13.0%
Germany Germany12.0%
Italy Italy6.3%
United Kingdom United Kingdom5.1%
France France4.9%
Canada Canada4.0%
China China3.7%
Netherlands Netherlands3.6%
Poland Poland2.7%
Russian Federation Russian Federation2.6%
Brazil Brazil2.5%
Australia Australia2.4%
Argentina Argentina1.3%
India India1.2%
Austria Austria1.2%
Ukraine Ukraine1.1%
Hungary Hungary1.0%
Czech Republic Czech Republic1.0%
Mexico Mexico0.9%
Belgium Belgium0.9%
Switzerland Switzerland0.7%
Japan Japan0.6%
South Africa South Africa0.6%
Turkey Turkey0.6%
Romania Romania0.5%
Bulgaria Bulgaria0.5%
Chile Chile0.5%
New Zealand New Zealand0.5%
Ireland Ireland0.5%

% of unknown IP addresses: 0.0%%

Most popular versions (Top 20):

2.28.010.3%
2.27.09.3%
2.22.06.0%
2.26.05.0%
2.25.04.3%
2.23.04.3%
2.24.04.2%
2.20.04.0%
1.48.02.7%
2.12.02.5%
2.19.02.2%
2.21.01.9%
2.16.01.9%
2.15.01.3%
2.14.01.2%
2.17.01.1%
2.18.01.1%
2.13.01.1%
2.5.01.0%
1.35.01.0%

Operating systems calibre runs on

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