The Best Intrusion Detection and Prevention Software in 2026
We researched intrusion detection and prevention products through official websites, including pricing pages, plan tables, and product documentation. Rankings reflect each product’s fit for the category’s core job, value for money, and verified features. Compare tools for detecting and blocking malicious network activity, exploits, and policy violations.
Our top picks
-
Top ranked
Suricata#1 of 379.3/10A capable free network IDS and IPS for teams prepared to manage self-hosted deployment.
Free plan
-
Runner-up
9.1/10A strong fit for Palo Alto environments needing inline zero-day and exploit prevention.
-
Top-ranked free plan
Snort#7 of 378.4/10A low-cost Snort engine with inline blocking and flexible packet analysis.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 37 tools, best first
-
Best forFree open-source network IDS and IPS
A capable free network IDS and IPS for teams prepared to manage self-hosted deployment.
- Inline blocking
- Encrypted traffic inspection
- Threat intelligence
9.3/10★★★★★Visit Suricata -
Best forAdvanced zero-day and exploit prevention
A strong fit for Palo Alto environments needing inline zero-day and exploit prevention.
- Cloud workload support
- Inline blocking
- Encrypted traffic inspection
9.1/10★★★★★Visit Palo Alto -
Best forEnterprise IPS with mature threat prevention
Enterprise IPS combining signature, behavioral, and virtual patching defenses.
- Cloud workload support
- Inline blocking
- Encrypted traffic inspection
8.9/10★★★★☆Visit Check Point -
Best forBroad hybrid IPS and malware defense
A broad hybrid IPS for organizations needing inline blocking and malware defense.
- Cloud workload support
- Inline blocking
- Encrypted traffic inspection
8.8/10★★★★☆Visit Trellix -
Best forNetwork appliances with detailed IPS controls
A focused network IPS for appliance-based deployments and granular policy control.
- Inline blocking
- Encrypted traffic inspection
- Threat intelligence
8.6/10★★★★☆Visit AhnLab -
Best forAppliance-based network threat prevention
A broad appliance IPS for inline blocking, encrypted traffic inspection, and centralized control.
- Inline blocking
- Encrypted traffic inspection
- Threat intelligence
8.5/10★★★★☆Visit Hillstone -
Best forLinux teams seeking low-cost Snort-based detection
A low-cost Snort engine with inline blocking and flexible packet analysis.
- Inline blocking
- Encrypted traffic inspection
- Threat intelligence
8.4/10★★★★☆Visit Snort -
Best forOpen-source Suricata monitoring and hunting
A free Suricata stack for network detection, hunting, dashboards, and packet analysis.
- Inline blocking
- Encrypted traffic inspection
- Threat intelligence
8.3/10★★★★☆Visit SELKS -
Best forCloud IPS for distributed user traffic
A cloud IPS for distributed users with inline detection, TLS inspection, and security integrations.
- Inline blocking
- Encrypted traffic inspection
- Threat intelligence
8.2/10★★★★☆Visit Zscaler -
Best forHigh-capacity network security appliances
A high-capacity appliance combining inline prevention, inspection, and centralized security management.
- Inline blocking
- Encrypted traffic inspection
- Threat intelligence
8.0/10★★★★☆Visit Huawei -
Best forAffordable multi-scope detection with threat sharing
A multi-scope, open-source IDS/IPS with free detection and paid threat-intelligence options.
- Cloud workload support
- Inline blocking
- Threat intelligence
7.8/10★★★★☆Visit CrowdSec -
Best forStraightforward appliance IPS deployment
A focused appliance IPS with SSL inspection, virtual patching, and weekly signatures.
- Inline blocking
- Encrypted traffic inspection
7.6/10★★★★☆Visit Zyxel -
Best forUsage-priced IPS inside AWS networks
A usage-priced AWS firewall with deep inspection, TLS controls, and Suricata-compatible IPS rules.
7.5/10★★★★☆Visit site -
Best forAzure-native cloud IPS
A focused Azure-native IPS for traffic inspection, filtering, and centralized firewall management.
7.4/10★★★★☆Visit Microsoft -
Best forHybrid IPS with automation and cloud support
A hybrid firewall and IPS suite with cloud support, automation, and broad controls.
7.3/10★★★★☆Visit FortiGate -
Best forOpen-source firewall with integrated Suricata IPS
A free, open-source firewall with integrated Suricata intrusion detection and prevention.
7.2/10★★★★☆Visit OPNsense -
Best forManaged branch and cloud firewall IPS
A broad firewall portfolio with IPS, encrypted-traffic inspection, and hybrid deployment options.
7.1/10★★★★☆Visit WatchGuard -
Best forHybrid firewall IPS for enterprise networks
A broad hybrid firewall and IPS platform for distributed enterprise networks.
7.0/10★★★★☆Visit Forcepoint -
Best forCloud-connected firewall with integrated IPS
A broad firewall and IPS platform for distributed, hybrid, and cloud-connected networks.
6.9/10★★★☆☆Visit Barracuda -
Best forBudget firewall IPS with a free edition
A flexible firewall IPS with a free edition and broad network security features.
6.8/10★★★☆☆Visit Arista -
Best forSecure appliance networking with attack blocking
A network security appliance combining attack blocking, VPN, filtering, and centralized management.
- Inline blocking
- Encrypted traffic inspection
- Threat intelligence
6.7/10★★★☆☆Visit Securepoint -
Best forFree open-source firewall and IPS stack
A free, self-hosted firewall and IPS stack with zones, VPN, monitoring, and add-ons.
6.5/10★★★☆☆Visit IPFire -
Best forFree firewall with Snort or Suricata IPS
A flexible firewall with optional Snort or Suricata intrusion prevention packages.
6.4/10★★★☆☆Visit pfSense -
Best forNetwork detection and investigation teams
Deep network detection and investigation with evidence, threat intelligence, and integrations.
- Cloud workload support
- Encrypted traffic inspection
- Threat intelligence
6.3/10★★★☆☆Visit Clear NDR -
Best forLow-cost host and cloud intrusion detection
A low-cost host security suite with cloud protection, compliance, and active response.
- Cloud workload support
- Threat intelligence
6.2/10★★★☆☆Visit Atomic OSSEC -
Best forFree host intrusion detection and monitoring
A flexible free HIDS with broad monitoring, plus paid rules, scanning, and support.
- Cloud workload support
- Threat intelligence
6.1/10★★★☆☆Visit OSSEC -
Best forOpen-source security monitoring across endpoints
A capable open-source choice for endpoint monitoring, detection, and response.
6.0/10★★★☆☆Visit Wazuh -
Best forDNS-focused threat and botnet blocking
A focused DNS security service for Fortinet environments that blocks domain-based threats.
- Encrypted traffic inspection
- Threat intelligence
5.9/10★★★☆☆Visit Fortinet -
Best forManaged DDoS attack mitigation
A focused DDoS mitigation platform for hybrid enterprise environments.
5.8/10★★★☆☆Visit Radware -
Best forWindows servers needing brute-force IP blocking
Blocks attacking IPs after failed logins across Windows server services.
- Inline blocking
- Threat intelligence
5.7/10★★★☆☆Visit RdpGuard -
Best forLinux users who need simple port-scan logging
Free Linux software for detecting and logging TCP port scans, not blocking them.
5.6/10★★★☆☆Visit Openwall -
Best forContainer runtime and image threat protection
A focused platform for scanning, controlling, and monitoring container workloads.
Pricing on request · 30-day trial Our Trend Vision One Container Security verdict → Visit Trend Micro5.5/10★★★☆☆Visit Trend Micro -
Best forJuniper firewall policy operations
A Juniper-focused firewall policy platform, rather than a directly verified intrusion prevention engine.
5.4/10★★★☆☆Visit Juniper -
Best forCentral management for Sophos firewalls
A centralized Sophos Firewall console, not a standalone intrusion prevention system.
5.3/10★★★☆☆Visit Sophos -
Best forStormshield firewall fleet management
A focused command center for supervising and orchestrating Stormshield SNS firewall fleets.
5.2/10★★★☆☆Visit Stormshield -
Best forCisco network infrastructure management
A strong Cisco infrastructure manager, but not a dedicated intrusion prevention platform.
4.9/10★★☆☆☆Visit Cisco -
Best forManaged authoritative and private DNS
A capable managed DNS service, but it is not an intrusion detection product.
1.0/10☆☆☆☆☆Visit Oracle OCI DNS
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Deployment model | Network scope | Score |
|---|---|---|---|---|---|---|
| 1 | Suricata | Yes | Free | Software | Network | 9.3 |
| 2 | Palo Alto Networks Advanced Threat Prevention | No | $0.009/GB usage-based | Hybrid | Multi-scope | 9.1 |
| 3 | Check Point Intrusion Prevention System (IPS) | Hybrid | Multi-scope | 8.9 | ||
| 4 | Trellix Intrusion Prevention System | Hybrid | Multi-scope | 8.8 | ||
| 5 | AhnLab AIPS | Appliance | Network | 8.6 | ||
| 6 | Hillstone Network Intrusion Prevention System | Appliance | Network | 8.5 | ||
| 7 | Snort | Yes | $29.99/device/yr | Software | Network | 8.4 |
| 8 | SELKS | Yes | Free | Software | Network | 8.3 |
| 9 | Zscaler Cloud IPS | Cloud | Network | 8.2 | ||
| 10 | Huawei HiSecEngine USG6800G | Appliance | Network | 8.0 | ||
| 11 | CrowdSec | Yes | $49/mo | Hybrid | Multi-scope | 7.8 |
| 12 | Zyxel Intrusion Prevention System | Appliance | Network | 7.6 | ||
| 13 | AWS Network Firewall | No | $0.07/GB usage-based | Cloud | 7.5 | |
| 14 | Azure Firewall Premium | No | Cloud | 7.4 | ||
| 15 | FortiGate | No | Hybrid | 7.3 | ||
| 16 | OPNsense | Yes | Hybrid | 7.2 | ||
| 17 | WatchGuard Firebox | Hybrid | 7.1 | |||
| 18 | Forcepoint Next Generation Firewall | Hybrid | 7.0 | |||
| 19 | Barracuda CloudGen Firewall | Hybrid | 6.9 | |||
| 20 | Arista NG Firewall | Yes | $270/yr | Hybrid | 6.8 | |
| 21 | Securepoint RC1000R G6 | No | Appliance | Network | 6.7 | |
| 22 | IPFire | Yes | Free | Hybrid | 6.5 | |
| 23 | pfSense | Yes | Hybrid | 6.4 | ||
| 24 | Clear NDR - Enterprise | No | Hybrid | Network | 6.3 | |
| 25 | Atomic OSSEC | No | $55/device/yr | Hybrid | Multi-scope | 6.2 |
| 26 | OSSEC | Yes | Hybrid | Multi-scope | 6.1 | |
| 27 | Wazuh | Yes | $571/mo | 6.0 | ||
| 28 | FortiGuard DNS Filtering Service | Network | 5.9 | |||
| 29 | Radware DefensePro | Hybrid | 5.8 | |||
| 30 | RdpGuard | No | $89.95/device one-time | Software | Host | 5.7 |
| 31 | scanlogd | Yes | Free | Software | Multi-scope | 5.6 |
| 32 | Trend Vision One Container Security | No | Hybrid | 5.5 | ||
| 33 | Juniper Security Director | Hybrid | 5.4 | |||
| 34 | Sophos Central Firewall Management | No | Cloud | 5.3 | ||
| 35 | Stormshield Management Center | Hybrid | 5.2 | |||
| 36 | Cisco Catalyst Center | Hybrid | 4.9 | |||
| 37 | Oracle Cloud Infrastructure DNS | No | 1.0 |
Head-to-head All 28 comparisons →
- Suricata vs Palo Alto Networks Advanced Threat Prevention
- Suricata vs Check Point Intrusion Prevention System (IPS)
- Suricata vs Trellix Intrusion Prevention System
- Suricata vs AhnLab AIPS
- Suricata vs Hillstone Network Intrusion Prevention System
- Suricata vs Snort
- Suricata vs SELKS
- Palo Alto Networks Advanced Threat Prevention vs Check Point Intrusion Prevention System (IPS)
- Palo Alto Networks Advanced Threat Prevention vs Trellix Intrusion Prevention System
Explore other topics All topics →
- AI Tools 303 directories · 8,270 tools ranked AI Writing Tools · AI Video Generators · Text-to-Speech Software
- Web Hosting & Domains 275 directories · 6,107 tools ranked Shared Web Hosting · Managed Cloud Hosting · Dedicated Server Hosting
- Productivity 157 directories · 4,948 tools ranked Note-Taking Apps · Calendar Apps · Project Management Software
- Marketing 135 directories · 3,977 tools ranked SEO Tools · Influencer Marketing Platforms · Email Marketing Software
- Sales & CRM 152 directories · 4,161 tools ranked Real Estate CRM Software · CRM Software · Proposal Software
- Customer Service 55 directories · 1,547 tools ranked Chatbot Builders · Knowledge Base Software · Call Center Software
How we rank intrusion detection and prevention software
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update