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OSSEC vs chkrootkit: catalog facts
OSSEC	chkrootkit
Free Free and open source; the OSSEC+ edition is also free after registration.	Free Free to download and use.
Self-hosted	Linux, Command line
Combines log analysis, file integrity monitoring and active response Custom rules and scripts for tailored alerting	Checks for many known rootkits and trojaned binaries Detects deleted login records and promiscuous interfaces
Configuration takes time to learn Extra features such as machine learning need registration for OSSEC+	Command-line only Runs on the system it checks, so a thorough rootkit could hide from it
Self-hosted	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.