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: 2,952,823 (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 Spain12.9%
United States United States11.8%
Germany Germany10.7%
China China6.8%
Italy Italy6.5%
France France5.9%
United Kingdom United Kingdom4.3%
Canada Canada3.5%
Netherlands Netherlands3.2%
Poland Poland2.8%
Russian Federation Russian Federation2.4%
Brazil Brazil2.4%
Australia Australia2.0%
India India1.5%
Argentina Argentina1.4%
Austria Austria1.1%
Hungary Hungary1.1%
Czech Republic Czech Republic1.0%
Mexico Mexico1.0%
Belgium Belgium0.9%
Ukraine Ukraine0.9%
Japan Japan0.9%
Turkey Turkey0.8%
Switzerland Switzerland0.8%
Bulgaria Bulgaria0.6%
Taiwan, Province of China Taiwan, Province of China0.6%
Romania Romania0.5%
Chile Chile0.5%
South Africa South Africa0.5%
Singapore Singapore0.4%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

3.10.09.4%
3.9.09.1%
3.8.08.4%
3.12.07.6%
3.7.07.0%
3.11.16.0%
3.6.03.2%
2.85.12.6%
3.4.01.9%
2.82.01.8%
2.83.01.5%
2.48.01.4%
1.48.01.2%
3.5.01.0%
3.3.01.0%
2.80.01.0%
2.76.00.9%
3.0.00.9%
2.78.00.8%
2.77.00.8%

Operating systems calibre runs on

win82.8%
osx15.0%
oth2.2%