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: 2,976,794 (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 (238 countries, top 30 shown):

	Spain	13.2%
	United States	12.0%
	Germany	10.6%
	China	6.5%
	Italy	6.5%
	France	5.8%
	United Kingdom	4.4%
	Canada	3.5%
	Netherlands	3.2%
	Poland	2.7%
	Brazil	2.4%
	Russian Federation	2.3%
	Australia	2.0%
	India	1.5%
	Argentina	1.4%
	Austria	1.1%
	Hungary	1.1%
	Mexico	1.0%
	Czech Republic	1.0%
	Belgium	0.9%
	Ukraine	0.9%
	Japan	0.9%
	Switzerland	0.8%
	Turkey	0.8%
	Bulgaria	0.6%
	Taiwan, Province of China	0.5%
	Romania	0.5%
	Chile	0.5%
	South Africa	0.5%
	New Zealand	0.4%

% of unknown IP addresses: 0.0%

Most popular versions (Top 20):

3.7.0	17.4%
3.9.0	11.2%
3.8.0	10.0%
3.6.0	7.3%
2.85.1	3.0%
3.4.0	2.6%
2.82.0	2.0%
2.83.0	1.7%
3.5.0	1.5%
2.48.0	1.4%
3.3.0	1.3%
1.48.0	1.2%
2.80.0	1.1%
3.0.0	1.1%
2.76.0	1.0%
3.2.1	1.0%
3.1.1	0.9%
2.78.0	0.9%
2.77.0	0.9%
2.79.1	0.8%

Operating systems calibre runs on

win	82.8%
osx	15.0%
oth	2.2%