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: 1,804,107 (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 (237 countries, top 30 shown):

Spain Spain13.8%
United States United States12.8%
Germany Germany11.6%
Italy Italy6.7%
France France6.0%
China China4.9%
United Kingdom United Kingdom4.5%
Canada Canada3.9%
Netherlands Netherlands3.3%
Poland Poland2.9%
Russian Federation Russian Federation2.2%
Australia Australia2.1%
Brazil Brazil1.9%
Austria Austria1.3%
India India1.3%
Argentina Argentina1.3%
Hungary Hungary1.2%
Czech Republic Czech Republic1.0%
Belgium Belgium1.0%
Ukraine Ukraine0.9%
Mexico Mexico0.9%
Switzerland Switzerland0.8%
Japan Japan0.8%
Turkey Turkey0.6%
Bulgaria Bulgaria0.6%
Romania Romania0.6%
South Africa South Africa0.5%
New Zealand New Zealand0.5%
Chile Chile0.5%
Ireland Ireland0.4%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

2.76.020.8%
2.77.08.0%
2.75.17.4%
2.74.04.7%
2.73.03.4%
2.71.03.0%
2.70.02.5%
2.75.02.1%
2.63.01.8%
2.69.01.7%
2.68.01.6%
2.72.01.5%
1.48.01.5%
2.48.01.4%
2.64.01.3%
2.56.01.2%
2.53.01.2%
2.62.01.2%
2.31.01.0%
2.58.00.9%

Operating systems calibre runs on

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