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: 3,019,809 (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 Spain13.3%
United States United States11.9%
Germany Germany11.0%
China China6.4%
Italy Italy6.3%
France France5.9%
United Kingdom United Kingdom4.4%
Netherlands Netherlands3.7%
Canada Canada3.5%
Poland Poland2.7%
Brazil Brazil2.4%
Russian Federation Russian Federation2.2%
Australia Australia2.0%
India India1.6%
Argentina Argentina1.4%
Austria Austria1.2%
Hungary Hungary1.1%
Belgium Belgium1.0%
Czech Republic Czech Republic1.0%
Mexico Mexico1.0%
Ukraine Ukraine0.9%
Japan Japan0.9%
Switzerland Switzerland0.8%
Turkey Turkey0.7%
Bulgaria Bulgaria0.6%
Chile Chile0.5%
Romania Romania0.5%
Taiwan, Province of China Taiwan, Province of China0.5%
South Africa South Africa0.5%
New Zealand New Zealand0.4%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

3.6.016.5%
3.4.010.0%
3.5.05.4%
3.3.04.9%
2.85.14.5%
3.2.14.1%
3.1.13.7%
2.82.02.6%
2.83.02.3%
3.0.02.0%
2.80.01.4%
2.48.01.3%
1.48.01.2%
2.76.01.2%
2.78.01.1%
2.77.01.1%
2.79.11.0%
2.71.01.0%
2.63.01.0%
2.84.00.9%

Operating systems calibre runs on

win82.9%
osx15.0%
oth2.1%