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: 3,125,864 (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 (240 countries, top 30 shown):

Spain Spain13.1%
United States United States12.7%
Germany Germany11.5%
Italy Italy6.6%
France France5.5%
China China5.1%
United Kingdom United Kingdom4.8%
Canada Canada3.7%
Netherlands Netherlands3.5%
Poland Poland2.6%
Brazil Brazil2.4%
Russian Federation Russian Federation2.3%
Australia Australia2.1%
India India1.5%
Argentina Argentina1.4%
Austria Austria1.3%
Hungary Hungary1.1%
Ukraine Ukraine1.0%
Belgium Belgium1.0%
Mexico Mexico0.9%
Czech Republic Czech Republic0.9%
Switzerland Switzerland0.8%
Japan Japan0.7%
Turkey Turkey0.7%
Bulgaria Bulgaria0.6%
Romania Romania0.5%
Chile Chile0.5%
South Africa South Africa0.5%
New Zealand New Zealand0.4%
Ireland Ireland0.4%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

2.63.011.8%
2.64.08.7%
2.68.06.5%
2.67.06.0%
2.65.14.6%
2.66.04.5%
2.62.03.3%
2.56.02.3%
2.53.02.0%
2.58.01.9%
1.48.01.7%
2.57.11.7%
2.48.01.7%
2.55.01.5%
2.61.01.4%
2.31.01.4%
2.54.01.4%
2.60.01.3%
2.52.01.3%
2.51.01.3%

Operating systems calibre runs on

win83.3%
osx14.9%
oth1.8%