Nuclei

Fast, template-based open-source vulnerability scanner with 8,000+ community-contributed detection templates

Open Source Vulnerability ScannerFree (open source) / ProjectDiscovery Cloud Platform from $100/monthOpen Source
How we work:This listing is aggregated from Nuclei's official documentation, public pricing pages, community discussions (Reddit, HN, forums), and real user feedback. We do not do hands-on testing. We aggregate and organize what's already out there. Last verified February 2026.

What is Nuclei?

Nuclei is a fast, template-based open-source vulnerability scanner developed by ProjectDiscovery. Built in Go for high performance, Nuclei uses YAML-based templates to define and execute vulnerability checks across web applications, networks, DNS, cloud services, and more. With over 8,000 community-contributed templates covering CVEs, misconfigurations, exposed panels, default credentials, and technology detection, Nuclei has become the preferred tool for security researchers, bug bounty hunters, and organizations wanting a highly customizable and extensible scanning engine.

Best for: Security teams and researchers wanting a fast, customizable, template-driven vulnerability scanner for web and infrastructure testing
Pros
  • ✓ Extremely fast scanning with Go-based concurrent execution
  • ✓ Highly customizable with easy-to-write YAML templates
  • ✓ Massive community-driven template library covering latest CVEs
  • ✓ Lightweight CLI tool perfect for CI/CD and automation pipelines
  • ✓ Active development with rapid community response to new vulnerabilities
Cons
  • ✗ Requires security expertise to interpret results and write custom templates
  • ✗ No built-in vulnerability management workflow or dashboard
  • ✗ Template quality varies across community contributions
  • ✗ Limited authenticated scanning compared to enterprise scanners
  • ✗ Not a complete vulnerability management platform — scanning engine only

Key Features

→YAML-based template engine for custom checks
→8,000+ community-contributed vulnerability templates
→High-speed concurrent scanning in Go
→Multi-protocol support (HTTP, DNS, TCP, SSL)
→CI/CD pipeline integration for DevSecOps
→Headless browser support for JavaScript-heavy applications
→Automatic template updates from community repository
→Output in JSON, SARIF, and multiple reporting formats

Nuclei Comparisons

Nuclei vs Tenable→Nuclei vs Arctic Wolf→Nuclei vs CrowdStrike Falcon Spotlight→Nuclei vs Microsoft Defender Vulnerability Management→Nuclei vs Greenbone OpenVAS→Nuclei vs Tanium→Nuclei vs Qualys VMDR→Nuclei vs Rapid7 InsightVM→

What People Are Saying

Real discussions and resources from the community.

Nuclei questions on Stack Overflow
Stack Overflow
Quick Info
PricingFree (open source) / ProjectDiscovery Cloud Platform from $100/month
ModelOpen source with optional cloud platform
Founded2020
CloudYes
Self-HostedYes
Open SourceYes
Visit Website →View on GitHub →

Last updated: Feb 20, 2026

Nuclei Alternatives
View All Alternatives
Tenable
Industry-leading vulnerability management platform with Ness...Qualys VMDR
Cloud-native vulnerability management platform with integrat...Rapid7 InsightVM
Risk-based vulnerability management platform with live dashb...CrowdStrike Falcon Spotlight
EDR-integrated scanless vulnerability assessment built on th...Microsoft Defender Vulnerability Management
Microsoft's built-in vulnerability management integrated wit...