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: 3,203,311 (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 Spain13.0%
United States United States12.9%
Germany Germany11.6%
Italy Italy6.3%
France France5.4%
China China5.1%
United Kingdom United Kingdom4.9%
Canada Canada3.8%
Netherlands Netherlands3.4%
Poland Poland2.7%
Russian Federation Russian Federation2.5%
Brazil Brazil2.5%
Australia Australia2.3%
India India1.4%
Argentina Argentina1.4%
Austria Austria1.2%
Hungary Hungary1.1%
Ukraine Ukraine1.0%
Czech Republic Czech Republic1.0%
Mexico Mexico0.9%
Belgium Belgium0.9%
Switzerland Switzerland0.8%
Turkey Turkey0.7%
Japan Japan0.7%
Bulgaria Bulgaria0.6%
South Africa South Africa0.6%
Chile Chile0.5%
Romania Romania0.5%
New Zealand New Zealand0.5%
Ireland Ireland0.5%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

Operating systems calibre runs on