The magazine is the fourth most popular German language computer magazine with a sold circulation of about 367,000 (Q3/2005; printed circulation: 482,000). With 239,000 subscriptions it is the computer magazine with the most subscribers in Europe.
c't covers both hardware and software; it focuses on software for the Microsoft Windows platform, but Linux and Apple Computer are also regularly featured. The magazine has a reputation of being very thorough, although critics claim that the magazine has been "dumbed down" in recent years to accommodate the mass market.
They offer a piece of software called Offline Update, a set of scripts to download Microsoft updates, combine it with an install script, and create a CD image. With Offline Update burned to a CD or DVD, a technician can update Windows 2000/XP/Vista and Microsoft Office 2003/2007 without an Internet connection. This is especially useful with people with no or slow Internet connections, or not exposing an unpatched install to the Internet.