Usage statistics

Usage statistics are collected whenever a user starts calibre. Every calibre installation has a randomly generated 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. And no collected information is ever shared with any third party.

Active installs: 861,307 (those that have started calibre at least once in the last 8 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 (232 countries, top 30 shown):

	United States	13.4%
	Spain	12.9%
	Germany	8.4%
	Italy	6.2%
	France	6.1%
	China	5.5%
	United Kingdom	4.3%
	Canada	4.3%
	Netherlands	3.1%
	Poland	2.7%
	Brazil	2.6%
	Australia	2.1%
	Russian Federation	1.9%
	India	1.7%
	Argentina	1.7%
	Japan	1.3%
	Mexico	1.3%
	Belgium	1.0%
	Hungary	1.0%
	Czech Republic	0.9%
	Austria	0.9%
	Turkey	0.8%
	Switzerland	0.8%
	Taiwan, Province of China	0.8%
	Ukraine	0.7%
	Chile	0.6%
	Hong Kong	0.5%
	Singapore	0.5%
	Romania	0.5%
	Bulgaria	0.5%

% of unknown IP addresses: 0.0%

Usage share by major version

5	38.9%
4	35.3%
3	18.0%
2	5.6%
1	1.3%
0	1.0%

Most popular versions (Top 20):

5.3.0	26.8%
4.23.0	8.8%
5.2.0	6.4%
3.48.0	3.7%
4.22.0	3.3%
5.0.1	2.8%
4.13.0	2.5%
5.1.0	2.4%
4.21.0	1.9%
4.20.0	1.7%
4.19.0	1.5%
4.18.0	1.5%
4.12.0	1.5%
4.17.0	1.4%
3.46.0	1.2%
4.15.0	1.2%
4.5.0	1.2%
4.8.0	1.2%
3.44.0	1.0%
3.40.1	0.9%

Operating systems calibre runs on

win	81.7%
osx	14.3%
oth	4.0%