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: 150,286 (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 (217 countries, top 30 shown):

United States United States21.2%
Spain Spain10.6%
Germany Germany8.3%
Canada Canada5.5%
China China5.4%
France France5.0%
Italy Italy4.9%
United Kingdom United Kingdom4.0%
Australia Australia2.8%
Netherlands Netherlands2.5%
Poland Poland2.4%
Brazil Brazil2.2%
Russian Federation Russian Federation2.1%
India India1.3%
Argentina Argentina1.3%
Mexico Mexico1.3%
Austria Austria1.0%
Japan Japan0.9%
Hungary Hungary0.9%
Belgium Belgium0.8%
Czech Republic Czech Republic0.8%
Ukraine Ukraine0.7%
New Zealand New Zealand0.7%
Switzerland Switzerland0.6%
Turkey Turkey0.5%
Taiwan, Province of China Taiwan, Province of China0.5%
South Africa South Africa0.5%
Romania Romania0.5%
Bulgaria Bulgaria0.5%
Chile Chile0.5%

Most popular versions (Top 20):

2.77.020.7%
2.76.08.8%
2.80.05.7%
2.74.03.6%
2.73.02.9%
2.71.02.6%
2.75.12.5%
2.79.12.4%
2.70.02.2%
2.78.02.2%
2.81.02.1%
2.69.01.5%
2.68.01.5%
2.63.01.5%
2.72.01.4%
1.48.01.4%
2.75.01.2%
2.64.01.2%
2.48.01.1%
2.56.01.1%

Operating systems calibre runs on

win82.6%
osx14.9%
oth2.5%