w3af
w3af: Extensible open-source DAST for Linux security engineers, with API and authenticated scanning. Ranked #24 of 26 in Dynamic Application Security Testing Software by our editors (7.1/10); pricing: Free plan; best for linux security engineers needing extensible open-source DAST.
At a glance
- Editor score7.1 / 10
- PricingFree plan
- Best forLinux security engineers needing extensible open-source DAST
- Free planYes
- Paid fromFree
- Authenticated scanningYes
- Facts checked22 Sep 2026
Where it wins
- Crawl, audit, and attack plugins support discovery through exploitation
- Authenticated scanning supports Basic, NTLM, form, cookie, and HTTP-header credentials
- REST API scanning, Docker execution, scripting, and multiple output formats
Where it doesn't
- Browser-based scanning is not supported
- Documented installation prerequisites use legacy Python 2.7-era dependencies
- Self-hosted deployment requires local Linux or macOS administration
Our verdict on w3af
w3af is an open-source framework for auditing and exploiting web applications. It is aimed at developers and penetration testers conducting web vulnerability assessments and penetration tests, with a particularly strong fit for Linux security engineers who want extensibility and local control. Its architecture separates crawling, auditing, and attacking: crawl plugins discover URLs, forms, and injection points; audit plugins send crafted data to identify vulnerabilities; and attack plugins can exploit findings when that step is appropriate. Console and GTK graphical interfaces provide different ways to operate the scanner.
The open-source pricing model keeps w3af outside a conventional tiered-plan structure. Its published capabilities center on the scanner itself rather than paid feature levels. The strongest functional depth is in combining authenticated testing with API assessment. w3af supports Basic, NTLM, form, cookie, and HTTP-header credentials, while REST API testing can use OpenAPI specifications or captured HTTP requests. Script-based automation can produce text, XML, or HTML output, giving teams options for scheduled or repeatable assessment workflows.
Platform fit is focused and self-hosted. w3af runs on Linux and macOS, offers Docker-based execution, and includes a REST API service with scan, knowledge-base, traffic, URL, and exception endpoints. An official Python REST API client is also available. That makes it suitable for teams comfortable managing local security tooling and extending workflows through scripts or services. It is a weaker choice for organizations that require browser-based scanning, modern browser-driven application coverage, or a managed SaaS experience. Teams should choose w3af for customizable web and API assessment; those priorities may point elsewhere when browser-based coverage is central.
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w3af pricing
w3af fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Authenticated scanning | Yes |
| API testing | Yes |
| Browser-based scanning | Not verified |
| CI/CD integration | Not verified |
| Deployment model | Self_hosted |
| Included scan targets | Not verified |
| Deployment | Self-hosted |
| Platforms | Linux, macOS |
| Support | Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | w3af.org |
| Facts checked | 22 Sep 2026 |
Alternatives to w3af
- Safeguard DASTBroad authenticated web and API scanning with paid plans starting at $9/month.9.4
- OWASP ZAPA capable free DAST tool with broad web, API, browser, and automation coverage.9.3
- apPosture DASTEvidence-backed DAST for developers who need deep web and API testing.9.2
Also Ranked In
w3af is ranked in 3 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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