The best replacement for keylogger is malware.

The best alternatives to keylogger are rated as following:

★★★★★	malware
★★★	trojan
★★★	ardamax

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Speaking about keylogger, one probably shouldn't forget about remote installation.

Other search terms related to keylogger and their ratings are:

★★★★★	remote installation
	trojan

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Google Trends

Scale is based on the average worldwide traffic of keylogger in all years. Click on graph for more.

keylogger

malware

trojan