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FAQ: updated 1.10 How many are using curl?
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bagder committed May 16, 2012
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We don't know how many users that downloaded or installed curl and then
never use it.

Some facts to use as input to the math:

curl packages are downloaded from the curl.haxx.se and mirrors over a
million times per year. curl is installed by default with most Linux
distributions. curl is installed by default with Mac OS X. curl and libcurl
as used by numerous applications that include libcurl binaries in their
distribution packages (like Adobe Acrobat Reader and Google Earth).

More than a hundred known named companies use curl in commercial
environments and products and more than a hundred known named open source
projects depend on (lib)curl.

In a poll on the curl web site mid-2005, more than 50% of the 300+ answers
estimated a user base of one million users or more.

In March 2005, the "Linux Counter project" estimated a total Linux user base
of some 29 millions, while Netcraft detected some 4 million "active" Linux
based web servers. A guess is that a fair amount of these Linux
installations have curl installed.

The Debian project maintains statistics on packages installed by people
who have voluntarily run their package counting application. In mid-2010,
libcurl3 was installed on over 55000 such systems (62% of reporting systems)
and was one of the 320 most popular installed packages (out of about 107000
possible packages).

All this taken together, there is no doubt that there are millions of
(lib)curl users.

http://curl.haxx.se/docs/companies.html
http://curl.haxx.se/docs/programs.html
http://curl.haxx.se/libcurl/using/apps.html
http://counter.li.org/estimates.php
http://news.netcraft.com/archives/2005/03/14/fedora_makes_rapid_progress.html
http://qa.debian.org/popcon.php?package=curl
In May 2012 Daniel did a counting game and came up with a number that may
be completely wrong or somewhat accurate. 300 million!

See http://daniel.haxx.se/blog/2012/05/16/300m-users/

1.11 Why don't you update ca-bundle.crt

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