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: 2,971,493 (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 Spain13.2%
United States United States12.0%
Germany Germany10.5%
China China6.6%
Italy Italy6.5%
France France5.8%
United Kingdom United Kingdom4.4%
Canada Canada3.5%
Netherlands Netherlands3.2%
Poland Poland2.7%
Brazil Brazil2.4%
Russian Federation Russian Federation2.3%
Australia Australia2.0%
India India1.5%
Argentina Argentina1.5%
Austria Austria1.1%
Hungary Hungary1.1%
Mexico Mexico1.0%
Czech Republic Czech Republic1.0%
Belgium Belgium0.9%
Ukraine Ukraine0.9%
Japan Japan0.9%
Switzerland Switzerland0.8%
Turkey Turkey0.8%
Bulgaria Bulgaria0.6%
Taiwan, Province of China Taiwan, Province of China0.5%
Romania Romania0.5%
Chile Chile0.5%
South Africa South Africa0.5%
New Zealand New Zealand0.4%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

3.7.017.2%
3.9.011.5%
3.8.09.6%
3.6.05.6%
2.85.12.9%
3.10.02.7%
3.4.02.5%
2.82.02.0%
2.83.01.7%
3.5.01.4%
2.48.01.4%
3.3.01.2%
1.48.01.2%
2.80.01.1%
3.0.01.0%
2.76.01.0%
3.2.10.9%
2.78.00.9%
3.1.10.9%
2.77.00.9%

Operating systems calibre runs on

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