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):

2.53.013.0%
2.55.010.3%
2.54.09.1%
2.52.06.6%
2.56.03.8%
2.51.03.2%
2.48.02.8%
2.50.12.6%
2.49.02.3%
1.48.02.0%
2.47.01.9%
2.31.01.9%
2.45.01.5%
2.46.01.3%
2.44.11.2%
2.41.01.2%
2.40.01.1%
2.38.01.0%
2.35.01.0%
2.12.01.0%

Operating systems calibre runs on

win83.7%
osx14.5%
oth1.8%