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: 3,082,202 (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 (241 countries, top 30 shown):

United States United States12.9%
Spain Spain12.6%
Germany Germany11.5%
Italy Italy6.4%
France France5.4%
China China5.1%
United Kingdom United Kingdom4.9%
Netherlands Netherlands3.8%
Canada Canada3.7%
Poland Poland2.6%
Brazil Brazil2.5%
Russian Federation Russian Federation2.4%
Australia Australia2.2%
India India1.5%
Argentina Argentina1.4%
Austria Austria1.3%
Hungary Hungary1.1%
Ukraine Ukraine1.0%
Belgium Belgium1.0%
Czech Republic Czech Republic1.0%
Mexico Mexico0.9%
Switzerland Switzerland0.8%
Japan Japan0.7%
Turkey Turkey0.7%
Bulgaria Bulgaria0.6%
South Africa South Africa0.5%
Chile Chile0.5%
Romania Romania0.5%
New Zealand New Zealand0.5%
Singapore Singapore0.5%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

2.62.011.0%
2.58.07.9%
2.57.15.7%
2.61.05.0%
2.60.04.8%
2.59.04.5%
2.56.03.9%
2.63.03.8%
2.53.02.8%
2.55.02.3%
2.54.02.0%
2.48.01.9%
1.48.01.8%
2.52.01.7%
2.51.01.7%
2.31.01.6%
2.50.11.4%
2.49.01.4%
2.47.01.3%
2.45.01.1%

Operating systems calibre runs on

win83.4%
osx14.8%
oth1.8%