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: 3,058,784 (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 Spain12.8%
United States United States12.2%
Germany Germany10.5%
China China6.7%
Italy Italy6.4%
France France6.2%
United Kingdom United Kingdom4.2%
Canada Canada3.6%
Netherlands Netherlands3.1%
Poland Poland2.8%
Russian Federation Russian Federation2.3%
Brazil Brazil2.2%
Australia Australia2.0%
India India1.5%
Argentina Argentina1.4%
Hungary Hungary1.2%
Turkey Turkey1.2%
Austria Austria1.2%
Czech Republic Czech Republic1.0%
Mexico Mexico1.0%
Belgium Belgium0.9%
Ukraine Ukraine0.9%
Japan Japan0.9%
Switzerland Switzerland0.8%
Bulgaria Bulgaria0.7%
Romania Romania0.6%
Taiwan, Province of China Taiwan, Province of China0.5%
South Africa South Africa0.5%
Chile Chile0.5%
New Zealand New Zealand0.5%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

3.14.015.3%
3.15.014.7%
3.12.08.2%
3.13.08.2%
3.7.02.9%
3.10.02.3%
3.9.02.0%
3.6.02.0%
2.85.11.9%
3.8.01.7%
3.11.11.7%
2.82.01.4%
2.48.01.4%
3.4.01.3%
2.80.01.2%
2.83.01.1%
1.48.01.1%
2.76.00.8%
3.3.00.7%
3.5.00.7%

Operating systems calibre runs on

win82.6%
osx15.2%
oth2.1%