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: 3,135,134 (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):

Spain Spain12.9%
United States United States12.8%
Germany Germany11.7%
Italy Italy6.4%
France France5.5%
China China5.0%
United Kingdom United Kingdom4.8%
Netherlands Netherlands3.8%
Canada Canada3.7%
Poland Poland2.6%
Brazil Brazil2.4%
Russian Federation Russian Federation2.3%
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 Turkey0.6%
Bulgaria Bulgaria0.6%
Romania Romania0.5%
Chile Chile0.5%
South Africa South Africa0.5%
New Zealand New Zealand0.5%
Singapore Singapore0.4%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

2.63.013.7%
2.64.010.2%
2.62.08.8%
2.65.15.3%
2.61.03.8%
2.56.02.7%
2.58.02.3%
2.53.02.2%
2.57.12.0%
2.60.01.9%
2.48.01.8%
1.48.01.7%
2.55.01.7%
2.59.01.6%
2.54.01.5%
2.31.01.5%
2.52.01.4%
2.51.01.4%
2.50.11.2%
2.49.01.2%

Operating systems calibre runs on

win83.3%
osx14.9%
oth1.8%