# Cobalt DAST vs Rexsser: side-by-side comparison (2026)

[Cobalt DAST](https://cybersectools.com/tools/cobalt-dast) is a commercial [dynamic application security testing](https://cybersectools.com/categories/dast) solution by [Cobalt](https://cybersectools.com/companies/cobalt). [Rexsser](https://cybersectools.com/tools/rexsser) is a free [dynamic application security testing](https://cybersectools.com/categories/dast) solution. Features, integrations, deployment and the company behind each one, side by side.

Need the answer fast? [Best DAST Solutions for Business](https://cybersectools.com/shortlists/best-dast-solutions) picks PortSwigger Burp Suite DAST, Invicti DAST, Rapid7 InsightAppSec and 4 more.

## Side-by-side comparison

| | Cobalt DAST | Rexsser |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | Dynamic Application Security Testing | Dynamic Application Security Testing |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| GitHub stars | – | 75 |
| Last commit | – | Nov 2020 |
| Company | Cobalt | – |
| Headquarters | – | – |

### Use cases and capabilities

| | Cobalt DAST | Rexsser |
|---|---|---|
| DAST | Yes | – |
| Web Security | Yes | – |
| Continuous Testing | Yes | – |
| App Security | Yes | – |
| Security Scanning | Yes | – |
| DevSecOps | Yes | – |
| Open Source | – | Yes |
| XSS | – | Yes |
| XSS Scanner | – | Yes |
| Regex | – | Yes |

### Core features

**Cobalt DAST**

8 features listed. Sign in on the page to see them.

**Rexsser**

No features listed.

### Integrations

**Cobalt DAST**

10 integrations listed. Sign in on the page to see them.

**Rexsser**

No integrations listed.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [Cobalt DAST](https://cybersectools.com/tools/cobalt-dast) fits if you want a cloud product.
- [Rexsser](https://cybersectools.com/tools/rexsser) fits if you need to run it on your own servers, you are a startup, you need a free product and you want an open-source product.

## Cobalt DAST vs Rexsser FAQ

Common questions when comparing Cobalt DAST vs Rexsser for dynamic application security testing.

### What is the difference between Cobalt DAST and Rexsser?

**Cobalt DAST**: Automated DAST tool for continuous web app and API vulnerability scanning, built by Cobalt.

**Rexsser**: A Burp Suite plugin that extracts keywords from HTTP responses using regex patterns and tests for reflected XSS vulnerabilities within the target scope.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes Cobalt DAST and Rexsser?

**Cobalt DAST** is made by Cobalt. **Rexsser** is open-source with 75 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Cobalt DAST a good alternative to Rexsser?

Often, yes. Cobalt DAST and Rexsser are both Dynamic Application Security Testing products. Key differences: Cobalt DAST is Commercial while Rexsser is Free, Rexsser is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Cobalt DAST vs Websecurify](https://cybersectools.com/compare/cobalt-dast-vs-websecurify)
- [Cobalt DAST vs Guardian360 Lighthouse](https://cybersectools.com/compare/cobalt-dast-vs-guardian360-lighthouse)
- [Cobalt DAST vs Probely (Snyk API & Web)](https://cybersectools.com/compare/cobalt-dast-vs-probely-snyk-api-and-web)
- [Rexsser vs Websecurify](https://cybersectools.com/compare/rexsser-vs-websecurify)
- [Rexsser vs Guardian360 Lighthouse](https://cybersectools.com/compare/guardian360-lighthouse-vs-rexsser)
- [Rexsser vs Probely (Snyk API & Web)](https://cybersectools.com/compare/probely-snyk-api-and-web-vs-rexsser)

## Alternatives to each

- [See all Cobalt DAST alternatives](https://cybersectools.com/alternatives/cobalt-dast)
- [See all Rexsser alternatives](https://cybersectools.com/alternatives/rexsser)

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Source: https://cybersectools.com/compare/cobalt-dast-vs-rexsser

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/cobalt-dast.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Cobalt DAST and Rexsser: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md