Hi,
I’ve a curious question:
Does Avast Free Antivirus catch keyloggers too?
yes, it will catch everything that is bad code
Sure 
It will be marked as infected or, at least, PUP (potential unwanted program).
Oh ok, thank you very much
Every comparative I have seen shows keylogger protection to be Avast’s weakest area. It always scores on my bottom of the pack.
PUP detection is off by default.
[i]I’ve a curious question:
Does Avast Free Antivirus catch keyloggers too?[/i]
No it dont have Safezone. Avast Internet Security have Safezone.
http://www.avast.com/da-dk/download-documentation
The avast! safeZone is an additional security feature that allows you to browse the web in a private, secure environment, invisible to the rest of your system. For example, if you do your banking or shopping online, or other security-sensitive transactions, you can be sure that your personal data cannot be monitored by spyware or key-logging software
The information given above your hasn’t changed in this now very old topic.
Key loggers can be both legit (business/parental installed to monitor activity, etc.) and malicious, depending on who installed it on the system - this would then be considered a PUP as outlined above - enable PUP scanning.
The fact that you highlight the use of the safezone to combat key-loggers, doesn’t mean that avast doesn’t detect key-loggers. The safezone is only in the Pro/AIS/Premier versions not the free version.