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.

Total installs: 25,878,213 (from Aug, 2009)

Active installs: 3,509,875 (those that have started calibre at least once in the last two months)

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. A user could get a new computer and install calibre on it, in which case he will show up twice in total installs and only once in active installs, and so on.

New installs in the month:

Oct, 2014:326,655
Sep, 2014:496,177
Aug, 2014:548,792
Jul, 2014:538,049
Jun, 2014:492,387
May, 2014:524,608
Apr, 2014:531,518
Mar, 2014:560,722
Feb, 2014:557,379
Jan, 2014:735,865
Dec, 2013:712,863
Nov, 2013:568,912

Installs by country (237 countries, top 30 shown):

United StatesUnited States:18.35%
SpainSpain:10.85%
GermanyGermany:9.62%
United KingdomUnited Kingdom:6.47%
ItalyItaly:5.05%
CanadaCanada:4.17%
Russian FederationRussian Federation:3.58%
NetherlandsNetherlands:3.18%
FranceFrance:3.11%
ChinaChina:3.04%
AustraliaAustralia:2.55%
BrazilBrazil:2.33%
PolandPoland:1.98%
UkraineUkraine:1.43%
IndiaIndia:1.30%
MexicoMexico:1.13%
ArgentinaArgentina:1.05%
Czech RepublicCzech Republic:0.97%
AustriaAustria:0.93%
HungaryHungary:0.90%
Viet NamViet Nam:0.85%
BelgiumBelgium:0.73%
JapanJapan:0.71%
Korea, Republic ofKorea, Republic of:0.65%
SwitzerlandSwitzerland:0.61%
RomaniaRomania:0.58%
PhilippinesPhilippines:0.57%
TurkeyTurkey:0.57%
South AfricaSouth Africa:0.55%
Taiwan, Province of ChinaTaiwan, Province of China:0.54%

% of unknown IP addresses: 0%

Most popular versions (Top 20):

2.5.02.0%
1.48.01.8%
2.3.01.6%
1.17.01.4%
1.5.01.4%
1.39.01.4%
1.35.01.3%
0.9.61.3%
0.9.271.2%
1.23.01.1%
0.9.101.1%
0.9.261.1%
0.9.111.0%
0.9.151.0%
2.0.01.0%
0.9.131.0%
1.18.01.0%
0.9.351.0%
1.0.00.9%
0.9.120.9%

Operating systems calibre runs on

win85.3%
osx12.8%
oth2.0%