OSSEC vs Suricata

OSSEC is an open-source host-based intrusion detection system for monitoring systems and network components. It analyzes logs, checks file integrity, monitors the Windows registry, detects rootkits, and can alert users in real time or take active response actions. Monitoring can be agent-based or agentless, and a centralized server applies policies across operating systems, with server-specific overrides. Alerts can use SMTP, SMS, and syslog; active response can block an attack immediately. The system runs on Linux, OpenBSD, FreeBSD, macOS, Solaris, and Windows, and supports self-hosted and cloud environments. OSSEC and OSSEC+ use command-line management; Atomic OSSEC editions add a management console and integrations with cloud services and other tools. OSSEC+ adds machine learning, ELK integration, threat sharing, and additional rules. Free OSSEC is listed at free; OSSEC+ is also free, with registration required. Atomic OSSEC is $5 a month per device. Atomic OSSEC SaaS offers a free 14-day trial for up to 10 endpoints.

Suricata is a free, open-source engine for network analysis, intrusion detection and prevention, and security monitoring. It uses signature rules to match known threats, policy violations, and malicious behavior, and can also detect traffic anomalies. A single instance can inspect multi-gigabit traffic using multi-threading and hardware acceleration. It logs HTTP requests, DNS queries and responses, TLS certificate and exchange data, and can extract files from network flows. Suricata automatically detects protocols such as HTTP on any port and applies relevant detection and logging. Its EVE output provides JSON event and alert data for Logstash and similar tools. The Open Information Security Foundation owns the code and supports the project. Suricata is licensed under GPLv2; OISF offers non-GPL licensing for organizations that want to use it in their products. Listed platforms include Linux, macOS, and Windows; downloads also include source for FreeBSD and UNIX and a Windows 64-bit installer. The listed stable release is 8.0.7, released September 15, 2026. Community support is available through a forum and Discord.