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: 3,045,726 (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):

Spain Spain13.7%
United States United States12.4%
Germany Germany11.6%
Italy Italy6.6%
France France5.8%
China China5.3%
United Kingdom United Kingdom4.4%
Canada Canada3.6%
Netherlands Netherlands3.4%
Poland Poland2.8%
Russian Federation Russian Federation2.4%
Brazil Brazil2.2%
Australia Australia2.1%
India India1.4%
Argentina Argentina1.3%
Austria Austria1.3%
Hungary Hungary1.2%
Czech Republic Czech Republic1.0%
Ukraine Ukraine1.0%
Belgium Belgium0.9%
Mexico Mexico0.9%
Switzerland Switzerland0.8%
Japan Japan0.8%
Turkey Turkey0.7%
Bulgaria Bulgaria0.6%
Romania Romania0.6%
South Africa South Africa0.5%
New Zealand New Zealand0.5%
Chile Chile0.5%
Taiwan, Province of China Taiwan, Province of China0.5%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

2.76.012.4%
2.74.08.9%
2.73.08.5%
2.77.04.7%
2.75.14.6%
2.71.03.7%
2.72.03.2%
2.70.02.8%
2.75.02.1%
2.63.01.9%
2.69.01.9%
2.68.01.7%
1.48.01.5%
2.48.01.4%
2.64.01.4%
2.56.01.3%
2.53.01.2%
2.62.01.2%
2.31.01.1%
2.58.00.9%

Operating systems calibre runs on

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