Continuous 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 to install · No security expertise required
S4E Cloud
Everyone shows you what is wrong now.
Pro protects you when things change.
Nothing to run on your side. Use Everyone to check your asset today, Pro to know when your risk changes tomorrow, Enterprise when you have a team and many assets.
Compare Everyone, Pro and Enterprise
Outside depth looks at what the internet sees. Inside depth signs in over SSH or WinRM and reads what is installed. A Connector brings servers inside your network into the same view.
| Everyone | Pro | Enterprise | |
|---|---|---|---|
| Coverage | |||
| Outside depth: network services and web app, seen from the internet | ✓ | ✓ | ✓ |
| Inside depth: authenticated host scan over SSH or WinRM, no agent to install | – | ✓ | ✓ |
| Servers inside your network, via S4E Connector (coming soon) | – | 1 Connector | Unlimited |
| Web crawling and fuzzing | ✓ | ✓ | ✓ |
| Operations | |||
| Continuous, change-aware monitoring | – | ✓ | ✓ |
| Scheduled scans | – | ✓ | ✓ |
| AI fix recommendations | – | ✓ | ✓ |
| Dark web and credential leak monitoring | – | ✓ | ✓ |
| Reports Hub with PDF export | – | ✓ | ✓ |
| Public API and webhooks | – | – | ✓ |
| Plan limits | |||
| Assets | 1 | 1 | Unlimited |
| Users | 1 | 1 | Multi-user |
| Tenants | 1 | 1 | Multi-tenant |
| Support | |||
| Support | Community | Dedicated account manager | |
S4E Self Hosted
Same scanner, your infrastructure.
Install S4E on a server you control. Findings never leave your network. Read the Self Hosted story.
Nessus Professional is $3,990/yr for a single user. S4E Self Hosted gives your whole team one console for web, network and host.
Compare Self Hosted and Self Hosted Enterprise
Both run on your own infrastructure. Self Hosted is the self-serve package for one team, Self Hosted Enterprise is the full platform.
| S4E Self Hosted | S4E Self Hosted Enterprise | |
|---|---|---|
| Coverage | ||
| Outside depth: network services and web app, seen from the internet | ✓ | ✓ |
| Inside depth: authenticated host scan over SSH or WinRM, no agent to install | ✓ | ✓ |
| S4E Connector for servers in other networks (coming soon) | 1 included | Unlimited |
| Web crawling and fuzzing | – | ✓ |
| Operations | ||
| Continuous, change-aware monitoring | – | ✓ |
| Scheduled scans | – | ✓ |
| AI fix recommendations (needs outbound internet) | ✓ | ✓ |
| Dark web and credential leak monitoring | – | ✓ |
| Reports Hub with PDF export | – | ✓ |
| Public API and webhooks | – | ✓ |
| Limits and license | ||
| Assets | Up to 50 | Unlimited |
| Users | Up to 5 | Unlimited |
| Tenants | 1 | Multi-tenant |
| License | Signed offline license file | Contract |
| Air-gapped install | – | ✓ |
| Support | ||
| Support | Dedicated self-hosted support channel | |
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 covers one critical asset at Outside and Inside depth, with one Connector (coming soon) for servers inside your network. For multiple assets, use Enterprise.
Why S4E
More than a scanner.
Continuous security for what you expose, and what sits behind it.
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 to install.
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 monitoring | Included | Usually manual or scheduled | Available |
| Inside depth (authenticated host scan) | Included | Usually separate | Included |
| Self-hosted option | Yes | Depends on product | Yes |
| Change-aware scanning | Included | Usually limited | Depends on product |
| AI remediation guidance | Included | Usually limited | Depends on product |
| No agent to install | 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, more Connectors for private networks, API access, compliance reporting, or a Self Hosted 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 plansInside depth is built on Openness, S4E's open source host scanner.
Your 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.