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: 3,353,636 (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 (241 countries, top 30 shown):

United States United States14.1%
Spain Spain13.8%
Germany Germany11.9%
Italy Italy6.7%
United Kingdom United Kingdom5.2%
France France4.8%
Canada Canada4.1%
Netherlands Netherlands3.4%
China China3.0%
Poland Poland2.8%
Russian Federation Russian Federation2.5%
Australia Australia2.5%
Brazil Brazil2.1%
Austria Austria1.3%
India India1.2%
Ukraine Ukraine1.1%
Hungary Hungary1.1%
Argentina Argentina1.1%
Czech Republic Czech Republic1.1%
Mexico Mexico0.9%
Belgium Belgium0.9%
Switzerland Switzerland0.7%
Romania Romania0.6%
Bulgaria Bulgaria0.6%
South Africa South Africa0.6%
Turkey Turkey0.5%
Japan Japan0.5%
New Zealand New Zealand0.5%
Ireland Ireland0.5%
Chile Chile0.5%

% of unknown IP addresses: 0.0%%

Most popular versions (Top 20):

2.19.010.3%
2.20.09.6%
2.16.06.9%
2.18.05.0%
2.17.05.0%
2.12.04.8%
2.15.04.1%
1.48.03.0%
2.14.02.6%
2.13.02.1%
2.5.01.6%
2.3.01.4%
1.35.01.3%
2.10.01.1%
2.11.01.1%
2.9.01.1%
2.0.01.0%
2.8.00.9%
2.7.00.9%
1.39.00.9%

Operating systems calibre runs on

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