# Nuclei

Template-based vulnerability scanner with thousands of community templates. Nuclei is free, with no paid plan attached, at github.com.

## Facts

- **Pricing tier:** Free
- **Works on:** CLI, macOS, Windows, Linux, Self-hosted
- **Works in browser:** No

## Capabilities

- Template-based vulnerability scanner with thousands of community templates
- AI-assisted template generation from natural-language prompts in the ProjectDiscovery ecosystem
- MIT licensed

## FAQ

### What is Nuclei?

Nuclei is listed under Security & IT Operations, in the Industry-Specific Tools category on Flocci AI Tools. Template-based vulnerability scanner with thousands of community templates. It is free, with no paid plan attached, and it lives at github.com.

### Is Nuclei free?

Nuclei is listed as fully free — there is no paid tier attached to it in the catalog. That makes it one of the 397 entries on Flocci AI Tools with no upgrade path built in.

### Can I use Nuclei in a browser, or is there an app?

Nuclei needs to be installed or self-hosted — it doesn't run in a browser tab. It is available on the command line, Mac, Windows, Linux and self-hosting.

### What can Nuclei do?

Nuclei does 3 things the catalog singles out: Template-based vulnerability scanner with thousands of community templates; ai-assisted template generation from natural-language prompts in the projectdiscovery ecosystem; mit licensed.

### What is the best free alternative to Nuclei?

Magika (Google) is the closest free alternative: it sits in the same Security & IT Operations sub-category and is free. Strix, garak (NVIDIA) and PentestGPT also start free. The full list is on the alternatives page.

## Related

- [Nuclei alternatives](https://aitools.flocci.in/alternatives/nuclei)
- [Security & IT Operations](https://aitools.flocci.in/category/industry-specific-tools/security-it-operations)
- [Best free AI tools for security and IT operations](https://aitools.flocci.in/best/best-security-it-operations)
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Source: Flocci AI Tools — https://aitools.flocci.in/tool/nuclei

Facts last verified: October 2026