Continuous External Security
Your website changes every day.
Its security should be checked every day too.
S4E continuously monitors your domain, detects new vulnerabilities and leaked credentials, and tells you exactly what to fix before attackers find them.
No credit card required · Full Pro access · Setup in under 2 minutes
No agent · No installation · No security expertise required
Free plan shows you what is wrong now.
Pro plan protects you when things change.
Use Free to check your asset today. Use Pro to know when your risk changes tomorrow.
| Free Plan | Pro Plan | |
|---|---|---|
| Scanning | One-time snapshot | Continuous monitoring |
| Scan type | Manual | Automatic, change-aware |
| Security checks | 11,000+ checks | 11,000+ continuously updated |
| Scan limits | Daily & monthly limits apply | Fair use — manual scans capped at a few per hour |
| Reports | Basic reports | Prioritized findings & remediation |
| Who runs scans | You manually | S4E monitors automatically |
| Alerts | – | Instant vulnerability alerts |
| Scan history | Limited | Full history |
| Fix guidance | Basic findings | AI-powered fix recommendations |
| Dark web | – | Credential leak & dark web monitoring |
| Best for | Testing S4E | Ongoing protection |
Product
See exactly what S4E finds and how to fix it
Product preview — representative UI.
Who it's for
Built for teams that need security
without building a security team
Pro is designed for one critical internet-facing asset. For multiple assets or internal infrastructure, use Enterprise.
Why S4E
More than a scanner.
Continuous security for your external attack surface.
How it works
Continuous, not quarterly
Traditional scanners run when you schedule them. S4E monitors your asset all the time.
Setup takes less than 2 minutes. No agent or installation required.
Trusted byand thousands more
S4E discovered a critical exposed service that our periodic scanner had missed. We were able to fix it before it became an incident.
ROI
A security incident costs more than a year of continuous monitoring
Recovery, downtime, lost revenue, emergency support, and reputational damage can turn one overlooked vulnerability into a major business cost. S4E Pro continuously monitors your most important internet-facing asset for less than $4 per day.
Comparison
S4E vs. the alternatives
| Feature | S4E Pro | Periodic Vuln Scan | Enterprise VM Platform |
|---|---|---|---|
| VA (Vulnerability Assessment) | Continuous | Periodic / on-demand | Scheduled |
| EASM | Included | Usually separate product | Depends on product |
| Web Scans | Included | Core feature | Included |
| Network Scans | Included | Usually included | Included |
| Continuous external monitoring | Included | Usually manual or scheduled | Available |
| Change-aware scanning | Included | Usually limited | Depends on product |
| AI remediation guidance | Included | Usually limited | Depends on product |
| No agent required | Yes | Usually | Depends on scope |
| Setup complexity | Low | Medium | High |
| Best for | SMB & SaaS teams | Periodic assessments | Large enterprise teams |
| Entry model | Self-service | Project or subscription | Enterprise contract |
Product capabilities vary by vendor and package.
Need multiple assets, internal scanning, API access, compliance reporting, or custom deployment? We'll scope it together.
Managing security for multiple clients? Use S4E as the scanning, monitoring, reporting, and automation engine behind your managed security service.
Explore MSSP plansYour asset changes. New vulnerabilities appear. S4E monitors both.
Start monitoring your most important internet-facing asset today. S4E will detect new risks, alert you, and show you how to fix them.