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: 3,043,059 (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 (238 countries, top 30 shown):

Spain Spain13.8%
United States United States11.9%
Germany Germany11.5%
Italy Italy6.6%
France France5.6%
China China5.2%
United Kingdom United Kingdom4.6%
Canada Canada3.6%
Netherlands Netherlands3.5%
Poland Poland2.8%
Russian Federation Russian Federation2.5%
Brazil Brazil2.3%
Australia Australia2.1%
India India1.4%
Argentina Argentina1.3%
Austria Austria1.3%
Hungary Hungary1.1%
Czech Republic Czech Republic1.0%
Ukraine Ukraine1.0%
Belgium Belgium1.0%
Mexico Mexico0.9%
Switzerland Switzerland0.8%
Japan Japan0.7%
Turkey Turkey0.7%
Bulgaria Bulgaria0.6%
Romania Romania0.5%
South Africa South Africa0.5%
Taiwan, Province of China Taiwan, Province of China0.5%
Chile Chile0.5%
New Zealand New Zealand0.5%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

2.71.011.8%
2.70.010.4%
2.73.07.5%
2.69.06.8%
2.72.05.6%
2.68.03.1%
2.63.02.6%
2.64.01.9%
2.48.01.7%
2.62.01.6%
1.48.01.6%
2.56.01.6%
2.53.01.5%
2.67.01.5%
2.58.01.2%
2.31.01.2%
2.57.11.2%
2.65.11.2%
2.66.01.1%
2.55.01.1%

Operating systems calibre runs on

win83.6%
osx14.5%
oth1.9%