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: 3,047,446 (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 Spain12.9%
United States United States12.2%
Germany Germany10.1%
China China7.0%
Italy Italy6.3%
France France6.0%
United Kingdom United Kingdom4.2%
Canada Canada3.6%
Netherlands Netherlands3.0%
Poland Poland2.8%
Russian Federation Russian Federation2.4%
Brazil Brazil2.3%
Australia Australia2.0%
India India1.5%
Argentina Argentina1.4%
Hungary Hungary1.2%
Austria Austria1.1%
Mexico Mexico1.1%
Czech Republic Czech Republic1.0%
Ukraine Ukraine1.0%
Belgium Belgium0.9%
Turkey Turkey0.9%
Japan Japan0.8%
Switzerland Switzerland0.8%
Bulgaria Bulgaria0.7%
Romania Romania0.6%
Taiwan, Province of China Taiwan, Province of China0.6%
Chile Chile0.5%
South Africa South Africa0.5%
New Zealand New Zealand0.5%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

3.15.012.7%
3.18.012.2%
3.17.09.7%
3.16.09.2%
3.14.04.8%
3.12.02.9%
3.7.02.3%
3.13.02.2%
2.85.11.7%
3.6.01.6%
3.10.01.5%
3.9.01.5%
2.48.01.4%
3.8.01.3%
2.82.01.2%
1.48.01.1%
3.4.01.1%
3.11.11.0%
2.83.01.0%
2.80.00.8%

Operating systems calibre runs on

win82.6%
osx15.2%
oth2.2%