Perimeterator vs FestIn: 2026 Comparison
Perimeterator is a free external attack surface management tool. FestIn is a free external attack surface management tool. Compare features, ratings, integrations, and community reviews side by side to find the best external attack surface management fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
AWS-focused security teams operating on a budget will appreciate Perimeterator's distributed enumeration approach, which catches misconfigured internet-facing resources that centralized scanners often miss due to account fragmentation and permission boundaries. It's free and runs from GitHub, meaning zero procurement cycles and immediate deployment across multi-account environments. Skip this if you need managed remediation workflows or compliance reporting; Perimeterator is a discovery and enumeration tool, not a ticketing system.
AppSec and cloud infrastructure teams hunting for S3 misconfigurations tied to their own domains should start with FestIn; it's free, which means you can run it immediately without budget cycles, and the DNS reconnaissance approach catches buckets that simpler bucket-enumeration tools miss. The 230 GitHub stars suggest active maintenance and community validation of the crawling methods. Skip this if your threat model requires continuous monitoring or remediation workflows; FestIn is a point-in-time discovery tool, not a compliance scanner.
