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: 3,106,557 (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 States13.0%
Spain Spain12.6%
Germany Germany11.4%
Italy Italy6.3%
France France5.4%
China China5.3%
United Kingdom United Kingdom4.8%
Canada Canada3.8%
Netherlands Netherlands3.5%
Poland Poland2.7%
Brazil Brazil2.5%
Russian Federation Russian Federation2.4%
Australia Australia2.3%
India India1.4%
Argentina Argentina1.4%
Austria Austria1.2%
Hungary Hungary1.0%
Ukraine Ukraine1.0%
Czech Republic Czech Republic0.9%
Mexico Mexico0.9%
Belgium Belgium0.9%
Switzerland Switzerland0.8%
Japan Japan0.7%
Turkey Turkey0.7%
Chile Chile0.6%
South Africa South Africa0.6%
Bulgaria Bulgaria0.6%
Romania Romania0.5%
New Zealand New Zealand0.5%
Singapore Singapore0.4%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

2.56.013.6%
2.57.19.4%
2.55.08.8%
2.54.08.2%
2.53.05.0%
2.52.02.7%
2.48.02.4%
2.51.02.4%
2.50.12.0%
2.49.01.9%
1.48.01.9%
2.31.01.8%
2.47.01.7%
2.45.01.3%
2.46.01.1%
2.41.01.1%
2.44.11.1%
2.40.01.0%
2.38.00.9%
2.12.00.9%

Operating systems calibre runs on

win83.6%
osx14.6%
oth1.8%