Burp Suite

Web application security testing toolkit

Freemium Cybersecurity
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A proxy sits between the browser and the site, so testers can inspect and change requests. Scanner, repeater, and intruder tools probe for issues such as injection and broken access control. Extensions add features, including AI-assisted ones.

A free community edition covers manual testing, while the professional and enterprise editions add automation.

OWASP ZAP is a free alternative. Burp Suite suits security analysts who test web apps.