# Ossec, Trend Micro Deep Discovery vs Tenable Nessus Comparison

| | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Star Rating** | 4.6 out of 5 | 4.3 out of 5 | 4.5 out of 5 | 
| **Total Reviews** | 10 | 17 | 301 | 
| **Largest Market Segment** | Small-Business (50.0% of reviews) | Mid-Market (43.8% of reviews) | Mid-Market (39.4% of reviews) | 
| **Entry Level Price** | No pricing available | No pricing available | $3,390.00 1 License With One-Time Purchase | 

---
## Top Pros & Cons

### Ossec

**Not enough data**

### Trend Micro Deep Discovery

**Not enough data**

### Tenable Nessus

Pros:
- Vulnerability Identification (20 reviews)
- Vulnerability Detection (18 reviews)

Cons:
- Slow Scanning (7 reviews)
- Expensive (6 reviews)

---
## Ratings Comparison
| Rating | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
  | **Meets Requirements** | 9.1 (9 reviews) | 8.8 (15 reviews) | 9.0 (248 reviews) | 
  | **Ease of Use** | 8.3 (9 reviews) | 8.7 (15 reviews) | 8.9 (250 reviews) | 
  | **Ease of Setup** | 8.1 (7 reviews) | 9.4 (6 reviews) | 8.8 (172 reviews) | 
  | **Ease of Admin** | 8.8 (7 reviews) | 8.9 (6 reviews) | 8.9 (161 reviews) | 
  | **Quality of Support** | 8.3 (8 reviews) | 8.8 (14 reviews) | 8.4 (229 reviews) | 
  | **Has the product been a good partner in doing business?** | 9.2 (6 reviews) | 9.2 (6 reviews) | 8.7 (149 reviews) | 
  | **Product Direction (% positive)** | 8.7 (9 reviews) | 10.0 (15 reviews) | 8.9 (238 reviews) | 

---
## Pricing

### Ossec

#### Entry-Level Pricing

No pricing available

#### Free Trial

No information available

### Trend Micro Deep Discovery

#### Entry-Level Pricing

No pricing available

#### Free Trial

No information available

### Tenable Nessus

#### Entry-Level Pricing

Plan: Pro - 1 Year

Price: $3,390.00 1 License With One-Time Purchase

Description: 1-year license of the industry-leading vulnerability assessment solution.

Key Features:
- Automate your vulnerability scanning process

[Browse all 4 editions](https://www.g2.com/products/tenable-nessus/pricing)

#### Free Trial

Yes

---
## Features Comparison By Category

### Network Sandboxing

| Product | Score | Reviews |
|---|---|---|
| **Ossec** | N/A | N/A |
| **Trend Micro Deep Discovery** | N/A | N/A |
| **Tenable Nessus** | N/A | N/A |

#### Sandbox

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Sandbox** | Not enough data | Not enough data | Not enough data | 

#### Evaluation

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Malware Evaluation** | Not enough data | Not enough data | Not enough data | 
| **Automatic Submission** | Not enough data | Not enough data | Not enough data | 
| **Automatic Evaluation** | Not enough data | Not enough data | Not enough data | 
| **Malware Probability Scores** | Not enough data | Not enough data | Not enough data | 

### Dynamic Application Security Testing (DAST)

| Product | Score | Reviews |
|---|---|---|
| **Ossec** | N/A | N/A |
| **Trend Micro Deep Discovery** | N/A | N/A |
| **Tenable Nessus** | N/A | N/A |

#### Administration

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **API / Integrations** | Not enough data | Not enough data | Not enough data | 
| **Extensibility** | Not enough data | Not enough data | Not enough data | 

#### Analysis

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Reporting and Analytics** | Not enough data | Not enough data | Not enough data | 
| **Issue Tracking** | Not enough data | Not enough data | Not enough data | 
| **Static Code Analysis** | Not enough data | Not enough data | Not enough data | 
| **Vulnerability Scan** | Not enough data | Not enough data | Not enough data | 
| **Code Analysis** | Not enough data | Not enough data | Not enough data | 

#### Testing

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Manual Testing** | Not enough data | Not enough data | Not enough data | 
| **Test Automation** | Not enough data | Not enough data | Not enough data | 
| **Compliance Testing** | Not enough data | Not enough data | Not enough data | 
| **Black-Box Scanning** | Not enough data | Not enough data | Not enough data | 
| **Detection Rate** | Not enough data | Not enough data | Not enough data | 
| **False Positives** | Not enough data | Not enough data | Not enough data | 

### Intrusion Detection and Prevention Systems (IDPS)

| Product | Score | Reviews |
|---|---|---|
| **Ossec** | 9.0/10 | 5 |
| **Trend Micro Deep Discovery** | 8.7/10 | 8 |
| **Tenable Nessus** | N/A | N/A |

#### Prevention

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Intrusion Prevention** | Not enough data | 9.0 (8 reviews) | Not enough data | 
| **Firewall** | Not enough data | 9.2 (8 reviews) | Not enough data | 
| **Encryption** | Not enough data | 8.5 (8 reviews) | Not enough data | 
| **Security hardening** | Not enough data | 8.5 (8 reviews) | Not enough data | 
| **Cloud Data Protection** | Not enough data | 8.1 (7 reviews) | Not enough data | 

#### Detection

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Intrusion Detection** | 9.7 (5 reviews) | 9.0 (8 reviews) | Not enough data | 
| **Security Monitoring** | 10.0 (5 reviews) | 8.5 (8 reviews) | Not enough data | 
| **Anti-Malware / Malware Detection** | Not enough data | 9.2 (8 reviews) | Not enough data | 

#### Administration

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Compliance** | 9.0 (5 reviews) | 9.0 (8 reviews) | Not enough data | 
| **Administration Console -** | 7.3 (5 reviews) | 9.0 (7 reviews) | Not enough data | 
| **API / integrations** | Not enough data | 8.1 (7 reviews) | Not enough data | 

#### Generative AI

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **AI Text Summarization** | Not enough data | Not enough data | Not enough data | 

#### Agentic AI - Intrusion Detection and Prevention Systems (IDPS)

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Autonomous Task Execution** | Not enough data | Not enough data | Not enough data | 
| **Proactive Assistance** | Not enough data | Not enough data | Not enough data | 

### Vulnerability Scanner

| Product | Score | Reviews |
|---|---|---|
| **Ossec** | N/A | N/A |
| **Trend Micro Deep Discovery** | N/A | N/A |
| **Tenable Nessus** | 8.2/10 | 158 |

#### Performance

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Issue Tracking** | Not enough data | Not enough data | Feature Not Available | 
| **Detection Rate** | Not enough data | Not enough data | 8.9 (139 reviews) ✓ Verified | 
| **False Positives** | Not enough data | Not enough data | 6.7 (136 reviews) ✓ Verified | 
| **Automated Scans** | Not enough data | Not enough data | 9.0 (135 reviews) ✓ Verified | 

#### Network

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Compliance Testing** | Not enough data | Not enough data | 8.8 (134 reviews) ✓ Verified | 
| **Perimeter Scanning** | Not enough data | Not enough data | 8.8 (127 reviews) ✓ Verified | 
| **Configuration Monitoring** | Not enough data | Not enough data | 8.4 (110 reviews) ✓ Verified | 

#### Application

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Manual Application Testing** | Not enough data | Not enough data | Feature Not Available | 
| **Static Code Analysis** | Not enough data | Not enough data | 7.3 (83 reviews) | 
| **Black Box Testing** | Not enough data | Not enough data | 7.8 (102 reviews) | 

#### Agentic AI - Vulnerability Scanner

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Autonomous Task Execution** | Not enough data | Not enough data | 8.1 (9 reviews) | 
| **Proactive Assistance** | Not enough data | Not enough data | 7.9 (8 reviews) | 

### API Security

| Product | Score | Reviews |
|---|---|---|
| **Ossec** | N/A | N/A |
| **Trend Micro Deep Discovery** | N/A | N/A |
| **Tenable Nessus** | N/A | N/A |

#### API Management 

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **API Discovery** | Not enough data | Not enough data | Not enough data | 
| **API Monitoring** | Not enough data | Not enough data | Not enough data | 
| **Reporting** | Not enough data | Not enough data | Not enough data | 
| **Change Management** | Not enough data | Not enough data | Not enough data | 

#### Security Testing

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Compliance Monitoring** | Not enough data | Not enough data | Not enough data | 
| **API Verification** | Not enough data | Not enough data | Not enough data | 
| **API Testing** | Not enough data | Not enough data | Not enough data | 

#### Security Management

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Security and Policy Enforcement** | Not enough data | Not enough data | Not enough data | 
| **Anomoly Detection** | Not enough data | Not enough data | Not enough data | 
| **Bot Detection** | Not enough data | Not enough data | Not enough data | 

### Malware Analysis Tools

| Product | Score | Reviews |
|---|---|---|
| **Ossec** | N/A | N/A |
| **Trend Micro Deep Discovery** | 8.9/10 | 9 |
| **Tenable Nessus** | N/A | N/A |

#### Detection

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Malware Detection** | Not enough data | 9.4 (8 reviews) | Not enough data | 
| **Compliance Monitoring** | Not enough data | 8.5 (8 reviews) | Not enough data | 
| **Threat Alerting** | Not enough data | 9.6 (8 reviews) | Not enough data | 

#### Analysis

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Malware Evaluation** | Not enough data | 8.8 (8 reviews) | Not enough data | 
| **Sandboxing** | Not enough data | 8.3 (7 reviews) | Not enough data | 
| **Threat Intelligence** | Not enough data | 9.4 (8 reviews) | Not enough data | 
| **File Analysis** | Not enough data | 9.0 (8 reviews) | Not enough data | 

#### Response

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Response Automation** | Not enough data | 8.3 (8 reviews) | Not enough data | 
| **Malware Removal** | Not enough data | 9.0 (8 reviews) | Not enough data | 
| **Data Protection** | Not enough data | 8.8 (8 reviews) | Not enough data | 

#### Generative AI

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **AI Text Summarization** | Not enough data | Not enough data | Not enough data | 

### Attack Surface Management

| Product | Score | Reviews |
|---|---|---|
| **Ossec** | N/A | N/A |
| **Trend Micro Deep Discovery** | N/A | N/A |
| **Tenable Nessus** | 8.3/10 | 6 |

#### Asset Management

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Asset Discovery** | Not enough data | Not enough data | 6.9 (6 reviews) | 
| **Shadow IT Detection** | Not enough data | Not enough data | 7.5 (6 reviews) | 
| **Change Management** | Not enough data | Not enough data | 4.7 (6 reviews) | 

#### Monitoring

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Gap Analysis** | Not enough data | Not enough data | 8.3 (6 reviews) | 
| **Vulnerability Intelligence** | Not enough data | Not enough data | 10.0 (6 reviews) | 
| **Compliance Monitoring** | Not enough data | Not enough data | 8.6 (6 reviews) | 
| **Continuous Monitoring** | Not enough data | Not enough data | 9.2 (6 reviews) | 

#### Risk Management

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Risk-Prioritization** | Not enough data | Not enough data | 9.2 (6 reviews) | 
| **Reconnaissance** | Not enough data | Not enough data | 9.2 (6 reviews) | 
| **At-Risk Analysis** | Not enough data | Not enough data | 8.6 (6 reviews) | 
| **Threat Intelligence** | Not enough data | Not enough data | 9.4 (6 reviews) | 

#### Generative AI

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **AI Text Summarization** | Not enough data | Not enough data | Not enough data | 

### Cloud Security

| Product | Score | Reviews |
|---|---|---|
| **Ossec** | N/A | N/A |
| **Trend Micro Deep Discovery** | N/A | N/A |
| **Tenable Nessus** | N/A | N/A |

#### Cloud Visibility

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Data Discovery** | Not enough data | Not enough data | Not enough data | 
| **Cloud Registry** | Not enough data | Not enough data | Not enough data | 
| **Cloud Gap Analytics** | Not enough data | Not enough data | Not enough data | 

#### Security

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Data Security** | Not enough data | Not enough data | Not enough data | 
| **Data loss Prevention** | Not enough data | Not enough data | Not enough data | 
| **Security Auditing** | Not enough data | Not enough data | Not enough data | 

#### Identity

| Feature | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **SSO** | Not enough data | Not enough data | Not enough data | 
| **Governance** | Not enough data | Not enough data | Not enough data | 
| **User Analytics** | Not enough data | Not enough data | Not enough data | 

---
## Categories

**Unique to Ossec (1):** [Intrusion Detection and Prevention Systems (IDPS)](https://www.g2.com/categories/intrusion-detection-and-prevention-systems-idps)

**Unique to Trend Micro Deep Discovery (3):** [Malware Analysis Tools](https://www.g2.com/categories/malware-analysis-tools), [Intrusion Detection and Prevention Systems (IDPS)](https://www.g2.com/categories/intrusion-detection-and-prevention-systems-idps), [Network Sandboxing Software](https://www.g2.com/categories/network-sandboxing)

**Unique to Tenable Nessus (4):** [ Attack Surface Management Software](https://www.g2.com/categories/attack-surface-management), [Vulnerability Scanner Software](https://www.g2.com/categories/vulnerability-scanner), [Dynamic Application Security Testing (DAST) Software](https://www.g2.com/categories/dynamic-application-security-testing-dast), [API Security Tools](https://www.g2.com/categories/api-security)


---
## Reviewer Demographics

### By Company Size

| Segment | Ossec | Trend Micro Deep Discovery | Tenable Nessus | 
|---|---|---|---|
| **Small-Business** | 50.0% | 25.0% | 26.1% | 
| **Mid-Market** | 30.0% | 43.8% | 39.4% | 
| **Enterprise** | 20.0% | 31.3% | 34.5% | 

### By Industry

#### Ossec

- **Financial Services:** 20.0%
- **Retail:** 10.0%
- **Religious Institutions:** 10.0%
- **Marketing and Advertising:** 10.0%
- **Information Technology and Services:** 10.0%
- **Computer & Network Security:** 10.0%
- **Aviation & Aerospace:** 10.0%
- **Apparel & Fashion:** 10.0%
- **Accounting:** 10.0%

#### Trend Micro Deep Discovery

- **Information Technology and Services:** 31.3%
- **Management Consulting:** 12.5%
- **Computer Software:** 12.5%
- **Staffing and Recruiting:** 6.3%
- **Publishing:** 6.3%
- **Non-Profit Organization Management:** 6.3%
- **Human Resources:** 6.3%
- **Furniture:** 6.3%
- **Computer & Network Security:** 6.3%
- **Banking:** 6.3%

#### Tenable Nessus

- **Information Technology and Services:** 25.7%
- **Computer & Network Security:** 16.5%
- **Financial Services:** 7.4%
- **Computer Software:** 6.0%
- **Banking:** 4.6%
- **Government Administration:** 3.9%
- **Higher Education:** 3.2%
- **Hospital & Health Care:** 2.5%
- **Education Management:** 2.1%
- **Telecommunications:** 2.1%
- **Other:** 26.1%

---
## Alternatives

### Alternatives to Ossec

- [Snort](https://www.g2.com/products/snort/reviews) — 4.0/5 stars (18 reviews)
- [LevelBlue USM Anywhere](https://www.g2.com/products/levelblue-usm-anywhere/reviews) — 4.4/5 stars (114 reviews)
- [Palo Alto Networks Next-Generation Firewalls](https://www.g2.com/products/palo-alto-networks-next-generation-firewalls/reviews) — 4.5/5 stars (167 reviews)
- [CrowdSec](https://www.g2.com/products/crowdsec/reviews) — 4.7/5 stars (87 reviews)
- [Hybrid Cloud Security](https://www.g2.com/products/trend-micro-hybrid-cloud-security/reviews) — 4.5/5 stars (187 reviews)
- [Check Point Quantum Intrusion Prevention System (IPS)](https://www.g2.com/products/check-point-quantum-intrusion-prevention-system-ips/reviews) — 4.4/5 stars (69 reviews)
- [Trellix Network Detection and Response (NDR)](https://www.g2.com/products/trellix-network-detection-and-response-ndr/reviews) — 4.1/5 stars (66 reviews)
- [Blumira Automated Detection & Response](https://www.g2.com/products/blumira-automated-detection-response/reviews) — 4.6/5 stars (123 reviews)
- [Check Point Infinity Platform](https://www.g2.com/products/check-point-infinity-platform/reviews) — 4.6/5 stars (117 reviews)
- [Cloud-Delivered Security Services](https://www.g2.com/products/cloud-delivered-security-services/reviews) — 4.4/5 stars (106 reviews)

### Alternatives to Trend Micro Deep Discovery

- [ESET PROTECT](https://www.g2.com/products/eset-protect/reviews) — 4.6/5 stars (971 reviews)
- [Coro Cybersecurity](https://www.g2.com/products/coro-cybersecurity/reviews) — 4.7/5 stars (231 reviews)
- [ANY.RUN Sandbox](https://www.g2.com/products/any-run-sandbox/reviews) — 4.7/5 stars (217 reviews)
- [Kaspersky Next Optimum](https://www.g2.com/products/kaspersky-next-optimum/reviews) — 4.3/5 stars (206 reviews)
- [Intezer](https://www.g2.com/products/intezer-intezer/reviews) — 4.5/5 stars (193 reviews)
- [Zscaler Internet Access](https://www.g2.com/products/zscaler-internet-access/reviews) — 4.4/5 stars (195 reviews)
- [Palo Alto Networks Next-Generation Firewalls](https://www.g2.com/products/palo-alto-networks-next-generation-firewalls/reviews) — 4.5/5 stars (167 reviews)
- [Blumira Automated Detection & Response](https://www.g2.com/products/blumira-automated-detection-response/reviews) — 4.6/5 stars (123 reviews)
- [LevelBlue USM Anywhere](https://www.g2.com/products/levelblue-usm-anywhere/reviews) — 4.4/5 stars (114 reviews)
- [Check Point Infinity Platform](https://www.g2.com/products/check-point-infinity-platform/reviews) — 4.6/5 stars (117 reviews)

### Alternatives to Tenable Nessus

- [Intruder](https://www.g2.com/products/intruder/reviews) — 4.8/5 stars (205 reviews)
- [Invicti (formerly Netsparker)](https://www.g2.com/products/invicti-formerly-netsparker/reviews) — 4.6/5 stars (69 reviews)
- [Detectify](https://www.g2.com/products/detectify/reviews) — 4.5/5 stars (51 reviews)
- [Wiz](https://www.g2.com/products/wiz-wiz/reviews) — 4.7/5 stars (794 reviews)
- [Burp Suite](https://www.g2.com/products/burp-suite/reviews) — 4.8/5 stars (129 reviews)
- [Acunetix by Invicti](https://www.g2.com/products/acunetix-by-invicti/reviews) — 4.1/5 stars (105 reviews)
- [Pentest-Tools.com](https://www.g2.com/products/pentest-tools-com/reviews) — 4.8/5 stars (100 reviews)
- [Veracode Application Security Platform](https://www.g2.com/products/veracode-application-security-platform/reviews) — 3.8/5 stars (25 reviews)
- [Orca Security](https://www.g2.com/products/orca-security/reviews) — 4.6/5 stars (266 reviews)
- [APPCHECK](https://www.g2.com/products/appcheck/reviews) — 4.6/5 stars (67 reviews)

---
## Top Discussions

### Ossec

No discussions available for this product.

### Trend Micro Deep Discovery

No discussions available for this product.

### Tenable Nessus

- Title: [Is there a free version of Nessus?](https://www.g2.com/discussions/is-there-a-free-version-of-nessus) — 2 comments
  > **Top comment:** "30 /15 days trail is available "
- Title: [What does Nessus Professional scan for?](https://www.g2.com/discussions/about-nessus-2b3f6c8f-4cde-460a-bd61-f2527f0cdb45) — 2 comments, 1 upvote
  > **Top comment:** "It scans the system for  different vulnerabilities depending on what policy you want to scan the system with (like Internal PCI, Policy Compliance, SCAP,..."
- Title: [What types of devices can Nessus Professional scan?](https://www.g2.com/discussions/device-types-78d9c056-eb92-4435-aad4-32afa6a1a445) — 2 comments, 1 upvote
  > **Top comment:** "Windows PCs/servers , Linux systems/servers, Mobiles, IPMI devices like iLO, iDRAC, network switches, storage arrays, etc."
- Title: [How many IP Addresses can I scan?](https://www.g2.com/discussions/ip-addresses-b6ef755d-8e1e-4949-818a-ec228e8ac779) — 2 comments, 1 upvote
  > **Top comment:** "It depends on your license."
- Title: [What do I need to run Nessus professional?](https://www.g2.com/discussions/environment-c71784d4-2685-42a7-870f-56620a4bcb97) — 2 comments, 1 upvote
  > **Top comment:** "you don't need any special requirements you can run on any windows or Linux machine without any hazel."

---
**Source:** [G2.com](https://www.g2.com) | [Comparison Page](https://www.g2.com/compare/ossec-vs-trend-micro-trend-micro-deep-discovery-vs-tenable-nessus)