is-website-vulnerable vs Grendel-Scan: 2026 Comparison
is-website-vulnerable is a free security scanning tool. Grendel-Scan is a free security scanning tool. Compare features, ratings, integrations, and community reviews side by side to find the best security scanning fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
DevSecOps teams managing frontend supply chain risk should use is-website-vulnerable because it catches known JavaScript library vulnerabilities that most web application scanners deprioritize, and it's free, which removes the friction of piloting before committing budget. The 2,021 GitHub stars reflect actual adoption by teams building CI/CD scanning into their pipelines rather than relying on manual assessments. Skip this if you need coverage beyond frontend dependencies or want detection across your entire application stack; is-website-vulnerable is deliberately narrow, scanning only what Snyk's database knows about, not unknown or server-side vulnerabilities.
Application security teams with limited budgets who need both automated scanning and manual testing capability will get the most from Grendel-Scan, since it covers both attack vectors in a single free tool without forcing you to patch together open-source utilities. The dual approach means you're not choosing between speed and depth; you run automated scans for baseline coverage, then layer manual penetration testing for logic flaws and business logic bypasses that scanners miss. Skip this if your org requires vendor support contracts, formal SLAs, or integration with a ticketing system; Grendel-Scan is built for teams comfortable operating independently.
