Introduction
SurfaceGuard vs Shodan vs Censys is really a comparison between three different security jobs.
SurfaceGuard, branded as Surface Guard on its official site, is positioned as an external attack surface monitoring tool with public monthly plans, monitored-domain limits, alerts, dashboards, AI-assisted classification, and integrations.
Shodan is an internet infrastructure search and intelligence platform. It is strongest when teams need to search IPs, ports, banners, products, exposed services, and internet-wide infrastructure data.
Censys is closer to a full internet intelligence and attack surface management platform. It provides global internet visibility through the Censys Platform and offers Attack Surface Management workflows for inventory, risks, monitoring, cloud connectors, and remediation prioritization.
The right choice depends on whether you need a lightweight EASM monitoring tool, raw infrastructure intelligence, or an enterprise-grade ASM and internet intelligence workflow.
TL;DR — SurfaceGuard vs Shodan vs Censys quick comparison
Choose Surface Guard when you want a simpler EASM monitoring product with public plan pricing, monitored-domain limits, reports, alerts, dashboards, and integrations.
Choose Shodan when your main requirement is internet infrastructure search, IP enrichment, exposed-service research, API access, network monitoring, or bulk internet data.
Choose Censys when you need a more mature internet intelligence and ASM workflow with structured global data, inventory, risks, cloud connectors, CVE context, dashboards, alerts, and enterprise packaging.
| Category | SurfaceGuard | Shodan | Censys |
|---|---|---|---|
| Best fit | Small and mid-sized teams that want EASM monitoring with public plan pricing | Researchers, analysts, SOC teams, and product teams that need internet infrastructure search and enrichment | Security teams that need internet intelligence, ASM inventory, risk tracking, and enterprise workflows |
| Primary job | Monitor external attack surface, classify risks, send alerts, and produce reports | Search and enrich internet-connected infrastructure data | Discover, monitor, and prioritize internet-facing assets and risks |
| Core object | Monitored domains and subdomains | IP addresses, ports, banners, hostnames, products, networks, and internet-wide queries | Hosts, domains, web entities, certificates, storage buckets, seeds, inventory assets, and risks |
| EASM depth | EASM-focused, but public scanner-level documentation is limited | Can support EASM workflows, but is not a full remediation workflow by itself | Strong ASM product with inventory, risks, dashboards, metrics, cloud connectors, and alerts |
| Infrastructure search | Not positioned as a global internet search engine | Core strength | Core strength through Censys Platform and Internet Map |
| Risk detection | Public site highlights AI classification, mitigation suggestions, and subdomain takeover monitoring | Provides infrastructure evidence and vulnerability context that teams must validate and operationalize | Censys ASM detects over 400 risk types associated with inventory assets |
| Monitoring | 24/7 scanning claim, weekly reports on StartUp, daily reports on Business | Shodan Monitor tracks exposed devices and network ranges | ASM continuously monitors attack surface inventory and risks |
| Pricing transparency | Public StartUp and Business monthly prices plus Custom | Public membership and API subscription prices plus Enterprise | Free, Starter, Search, and Enterprise platform tiers; ASM packaging should be verified by quote and Assets Under Management scope |
| Main caution | Verify scanner coverage, evidence quality, currency, taxes, API limits, and exact integration behavior | Do not treat search results as a complete EASM remediation program | Expect enterprise-style pricing and implementation; verify modules, data tiers, credits, and AUM scope |
What each tool actually does
These tools overlap around external exposure, but they are not interchangeable.
The easiest way to compare them is to separate monitoring, search, and attack surface workflow.
- SurfaceGuard — Surface Guard presents itself as an external attack surface management product that continuously scans a company’s external attack surface, discovers new assets, identifies vulnerabilities, classifies risks, suggests mitigation actions, and sends alerts through channels such as email, Slack, Teams, and Discord. Its public site lists StartUp, Business, and Custom plans, monitored-domain limits, weekly or daily reports, compliance reports on Business, integration API, Slack and Teams integrations, SIEM integration on Custom, and public references to Splunk and Wazuh. The strongest public signals are pricing clarity, monitoring positioning, alerting, dashboards, AI-assisted classification, and subdomain takeover examples. The weaker area is scanner-level transparency.
- Shodan — Shodan is an internet intelligence and infrastructure search platform. It helps users search and enrich data about internet-connected devices and services, including open ports, banners, products, hostnames, SSL/TLS details, CPEs, vulnerabilities, tags, screenshots, and network context. Shodan also offers APIs, Monitor, Maps, Images, on-demand scanning, integrations with tools such as Metasploit, Maltego, Nmap, and Splunk, plus Enterprise capabilities such as bulk data, firehose access, custom surveys, internet scanning, and historical internet snapshots. Shodan is strongest when the job is search, enrichment, research, and data access.
- Censys — Censys provides internet intelligence through its Internet Map and Censys Platform. The platform supports structured investigation across hosts, certificates, web properties, services, software, CVEs, WHOIS, TLS, labels, and other internet infrastructure context. Censys Attack Surface Management helps teams discover and monitor internet-facing inventory, detect risks such as misconfigurations, vulnerabilities, and unknown exposures, use seeds to build an attack surface inventory, connect cloud providers, review dashboards, and receive risk notifications on supported levels. Censys is the strongest fit when a team needs enterprise-grade internet intelligence plus ASM workflows.
SurfaceGuard vs Shodan vs Censys feature breakdown
The main feature difference is workflow depth.
Surface Guard is monitoring-first, Shodan is search-first, and Censys is intelligence-and-ASM-first.
| Feature | SurfaceGuard | Shodan | Censys | Practical takeaway |
|---|---|---|---|---|
| External attack surface monitoring | Yes. Public site describes 24/7 scanning and automatic asset discovery. | Partly. Shodan Monitor tracks exposed devices and network ranges. | Yes. Censys ASM discovers and monitors internet-facing inventory. | Censys is strongest for mature ASM; Surface Guard is simpler; Shodan is more infrastructure-monitoring oriented. |
| Internet-wide search | Not publicly positioned as a global internet search engine. | Yes. This is Shodan’s core strength. | Yes. Censys Platform is built on a global Internet Map. | Use Shodan or Censys for broad internet search. |
| Subdomain monitoring | Yes. Public site highlights subdomain monitoring and subdomain takeover detection. | Can support subdomain research through hostnames, certificates, and search queries. | Yes. ASM inventory and seeds can map internet-facing assets. | Surface Guard and Censys are more directly EASM-oriented. |
| Open ports and exposed services | Not publicly detailed at scanner level. | Core strength through indexed ports, services, banners, products, and API lookups. | Core strength through hosts, services, protocols, and structured internet data. | Shodan and Censys are stronger for raw exposed-service intelligence. |
| Risk inventory | Public site says it identifies vulnerabilities, classifies risk, and suggests mitigation. | Provides evidence and vulnerability context, but risk inventory workflow usually must be built around it. | Yes. Censys ASM documents risk instances and over 400 risk types. | Censys has the strongest public risk-inventory evidence. |
| CVE context | Not publicly detailed at scanner level. | Can show vulnerability context in indexed infrastructure data. | Censys ASM can map known CVEs for detected software and use CVSS, KEV, and network attack vector context for CVE risks, but access to some exploit context depends on the ASM package or add-on. Rapid Response risks are a separate case and do not include CVSS, KEV catalog information, or attack-vector information. | Censys is stronger for ASM-linked CVE workflow, but buyers should verify package-level access. |
| Cloud exposure | Not publicly detailed at provider-connector level. | Can reveal cloud-hosted exposed services through internet data. | Cloud connectors integrate with providers such as AWS, GCP, and Azure. | Censys is stronger for formal cloud inventory connection. |
| Dashboards | Basic dashboard on StartUp and advanced dashboard on Business. | Search, Monitor, Maps, Images, API, and Enterprise portal workflows. | Overview Dashboard, Trends & Benchmarks, Risks, inventory, and platform views. | Censys is strongest for enterprise dashboards; Surface Guard is simpler. |
| Reports | Weekly reports on StartUp, daily and compliance reports on Business, custom reports on Custom. | Search result downloads and API workflows; formal reporting depends on implementation and plan. | Dashboards, risk workflows, APIs, and enterprise reporting patterns; exact report outputs should be verified. | Surface Guard is clearer on report cadence in public pricing. |
| Integrations | Slack, Teams, Discord, Splunk, Wazuh, API, SIEM positioning. | Metasploit, Maltego, Nmap, Splunk, API, Monitor, and Enterprise data workflows. | Censys documents ASM integrations including cloud connectors, Jira, Webex Teams, Google Security Operations, Microsoft Sentinel, Microsoft Teams, Qualys VMDR, email notifications, ServiceNow, Slack, Splunk, Tenable Vulnerability Management, webhooks, and Wiz; verify availability by tier and module. | Integration fit depends heavily on your existing SOC and engineering workflow. |
| AI positioning | Strong public AI messaging for identification, classification, and mitigation suggestions. | Not primarily marketed as an AI EASM workflow. | Censys Platform includes Censys Assistant access by tier, and enterprise intelligence workflows. | Do not buy based only on AI claims; verify evidence quality and explainability. |
| Documentation depth | Light public product page. | Strong public docs for platform, API, products, and enterprise data access. | Strong public docs for platform tiers, ASM, risks, metrics, APIs, and transitions. | Shodan and Censys are easier to validate from public documentation. |
Coverage comparison
Coverage is where buyers often make the wrong comparison.
Surface Guard’s coverage should be evaluated as monitored-domain EASM coverage. Shodan’s coverage should be evaluated as indexed internet infrastructure coverage. Censys’ coverage should be evaluated as global internet intelligence plus ASM inventory and risk workflow coverage.
A demo should use your owned assets, not vendor screenshots.
| Coverage area | SurfaceGuard | Shodan | Censys |
|---|---|---|---|
| Known domains | Public plan limits are based on monitored domains | Can search and monitor related IPs, hosts, and networks | ASM inventory can start from seeds such as domains, ASNs, and IP addresses |
| Unknown assets | Public site says it automatically discovers new assets | Strong when unknown assets are visible in Shodan’s internet data | Strong ASM positioning with attribution and internet-facing inventory discovery |
| Subdomain takeover | Explicitly highlighted on the public site | Can support research, but not a full remediation workflow by itself | Covered through ASM risk workflows where applicable |
| Ports and services | Not publicly detailed at port-coverage level | Core strength | Core strength |
| Certificates and TLS | Not publicly detailed at scanner level | Strong search and enrichment context | Strong certificate and TLS context in platform data |
| Cloud assets | Not publicly detailed at provider-connector level | Can reveal exposed cloud-hosted services | Cloud connectors for AWS, GCP, and Azure are documented |
| Risk types | Public site describes vulnerabilities and AI risk classification | Vulnerability context exists, but teams need their own workflow around it | Censys ASM documents over 400 risk types |
| Ownership and remediation | Mitigation suggestions and reports are publicly described | Mostly analyst-driven unless built into custom workflow | ASM dashboard, risk, metrics, and notification workflows are documented |
Pricing comparison
Pricing is not an apples-to-apples comparison because these tools price different jobs.
Surface Guard publishes public monthly prices for StartUp and Business plans. Shodan publishes public membership and API subscription prices.
Surface Guard’s public plan table lists prices in U.S. dollars, while other page copy includes Brazil-focused cost examples. Buyers should verify currency, taxes, billing terms, contract scope, and procurement details directly with the vendor.
Censys documents Free, Starter, Search, and Enterprise platform tiers. Starter can be purchased through credits, while Search and Enterprise require contacting sales. For ASM packaging, Censys uses Assets Under Management as a pricing and packaging metric, and buyers should verify AUM scope in the quote.
Always verify current pricing, taxes, currency, credits, billing terms, commercial-use rights, monitored-domain definitions, AUM scope, and support levels before procurement.
| Vendor | Plan or model | Publicly listed scope | What to verify |
|---|---|---|---|
| SurfaceGuard | StartUp — $199/month | Up to 3 monitored domains, weekly reports, email alerts, chat support, basic dashboard | Currency, taxes, billing terms, exact scanner list, domain definition, report format, and alert payloads |
| SurfaceGuard | Business — $459/month | Up to 20 monitored domains, daily reports, compliance reports, real-time alerts, Slack/Teams integrations, advanced dashboard, integration API, priority support | Currency, taxes, compliance report scope, API limits, Slack/Teams setup, and scanner evidence quality |
| SurfaceGuard | Custom — on request | Unlimited domains, custom reports, custom integrations, SIEM integration, dedicated support, custom SLA, team training | SLA wording, SIEM data format, Splunk/Wazuh behavior, contract terms, onboarding, and support scope |
| Shodan | Membership — $49 one-time | Individual access tier for getting started | Current availability, feature access, query limits, academic eligibility, commercial-use rights, and export needs |
| Shodan | Freelancer — $69/month | API subscription tier for results, scanning, monitoring, and enrichment use cases | Query credits, scan credits, alert credits, monitored IP count, API access, rate limits, and billing terms |
| Shodan | Small Business — $359/month | Higher monthly usage tier for teams that need more data and monitoring capacity | Result limits, scanning limits, monitored IPs, team workflow, support, and billing terms |
| Shodan | Corporate — $1099/month | Higher API subscription tier with broader access and limits | Credit limits, monitoring scale, API usage, data rights, support, and enterprise needs |
| Shodan | Enterprise — contact sales | Bulk data, enterprise data license, firehose, custom surveys, internet scanning, and commercial-use workflows | Bulk data rights, retention, attribution, commercial licensing, support, and legal terms |
| Censys | Censys Free | Basic internet visibility, limited access, and monthly credits for Free users | Credit usage, available protocols, API lookup access, export limits, and whether free access is enough for evaluation |
| Censys | Censys Starter | Credit-based upgraded access for deeper platform use | Credit cost, API access, query features, regex support, protocol visibility, and team requirements |
| Censys | Censys Search | Contact sales for Search-level data and features | Data access, SSO, users, API permissions, vulnerability data availability, exports, and commercial terms |
| Censys | Censys Enterprise / ASM | Quote-based enterprise access; ASM packaging uses Assets Under Management as a scope and pricing metric | AUM definition, included modules, cloud connectors, alerts, risk workflows, support, data retention, credits, and add-ons |
Who should use which tool
The best tool depends on your operating model.
A lean security team may value simple monitoring and clear monthly pricing. A SOC or threat research team may value internet-wide search and APIs. An enterprise exposure-management team may need ASM inventory, risks, metrics, cloud connectors, and platform access controls.
| Buyer need | Better fit | Why |
|---|---|---|
| Simple EASM monitoring with public plan pricing | SurfaceGuard | Surface Guard lists monitored-domain limits, reports, alerts, dashboards, and integrations in public pricing. |
| Internet infrastructure search | Shodan or Censys | Both are built around internet intelligence. Shodan is especially strong for search, API enrichment, and exposed-service research. |
| Enterprise ASM inventory and risk workflow | Censys | Censys ASM documents inventory, seeds, risks, dashboards, metrics, cloud connectors, and alerts. |
| IP and port enrichment inside internal tools | Shodan | Shodan API, host lookup, Monitor, and Enterprise data workflows fit enrichment use cases well. |
| Cloud-connected ASM | Censys | Censys documents cloud connectors for AWS, GCP, and Azure. |
| Subdomain takeover-focused monitoring | SurfaceGuard or Censys | Surface Guard explicitly highlights subdomain takeover; Censys handles risk detection through ASM workflows. |
| SOC research and threat hunting | Shodan or Censys | Both provide internet intelligence, but Censys offers broader platform workflows and adversary investigation modules for enterprise customers. |
| Budget-visible first purchase | SurfaceGuard or Shodan | Both publish clear public prices for several tiers. Censys enterprise ASM pricing generally requires quote validation. |
| Formal risk dashboards and metrics | Censys | Censys ASM documents dashboards, trends, benchmarks, attack surface size, and risk workflows. |
| SIEM-centered integration | SurfaceGuard, Shodan, or Censys depending on stack | Surface Guard publicly references Splunk and Wazuh; Shodan references Splunk and enterprise data workflows; Censys documents integrations such as Microsoft Sentinel, Splunk, Google Security Operations, ServiceNow, Slack, Jira, Webhook, and other ASM integrations, with availability depending on tier and module. |
Trial and demo questions to ask
Do not evaluate these products only from marketing pages.
Use the same owned domain, the same subdomain list, the same exposed service, and the same remediation example across every trial.
- What exactly counts as an asset? — Ask whether domains, subdomains, IPs, services, certificates, storage buckets, web entities, and monitored networks are counted separately.
- How does the tool prove ownership? — Clarify whether it uses monitored domains, seeds, verified assets, IP ranges, cloud connectors, or manual attribution.
- What data sources are used? — Ask which parts come from active scans, passive DNS, certificate transparency, internet indexing, cloud connectors, vendor APIs, or customer-provided inventory.
- How are false positives handled? — Verify whether findings can be accepted, closed, suppressed, routed, assigned, or revalidated.
- What does a clean result mean? — Ask how scan gaps, unavailable checks, credit limits, API failures, excluded assets, and missing integrations are shown.
- Can the finding become an engineering task? — A useful EASM workflow should include evidence, owner, severity, remediation, validation, history, and export or webhook options.
- How are CVEs mapped? — Ask whether CVEs are banner-derived, software-derived, verified, KEV-aware, package-dependent, or only enrichment signals that require validation.
- What integrations are included in the plan? — Do not assume Slack, Teams, Discord, Splunk, Wazuh, Microsoft Sentinel, Jira, ServiceNow, email, webhooks, API access, SSO, or exports are included at the tier you plan to buy.
- How will pricing scale? — Ask about monitored domains, AUM, IPs, credits, API calls, scan credits, team seats, data exports, modules, cloud connectors, and enterprise support.
Where ExternalSight fits if you are evaluating all three
If the reason you are comparing SurfaceGuard, Shodan, and Censys is external attack surface monitoring, ExternalSight should also be evaluated as a domain-focused EASM workflow.
ExternalSight is built for internet-facing domains and combines on-demand asynchronous scans, continuous monitoring for verified domains, issue classification, remediation planning, historical comparison, alerting, PDF export, JSON export on supported plans, and plan-gated notifications and webhooks.
Its scanner workflow covers DNS, certificate transparency, subdomains, technology detection, SSL/TLS, HTTP headers, TLS configuration, subdomain takeover, API discovery, JavaScript endpoints, cookie security, CORS, mixed content, redirects, credentials, secrets, phishing, ports, cloud exposure, email spoofing, zone transfer, admin panels, infrastructure, login surface, sensitive files, open redirects, host header issues, GraphQL, exposed services, Firebase, Wayback, supply chain, asset discovery, IP intelligence, WAF, robots.txt, security.txt, sitemap, reputation, WHOIS, CSP, Shodan, passive DNS, OTX, and attack-chain evaluation.
Some external-source checks may report unavailable when API keys or upstream services are not configured. Review scan coverage before treating a clean scan as a clean surface.
ExternalSight does not replace Shodan’s global internet search, Censys’ enterprise internet intelligence platform, a SIEM, a SOC, a WAF, a penetration test, or a cloud security platform. Its role is to turn verified-domain exposure into classified, monitored, exportable, owner-actionable security work.
Final verdict
Surface Guard is the best fit when you want a simpler EASM monitoring product with public plan prices, monitored-domain limits, reports, alerts, dashboards, AI-assisted positioning, and clear integration claims.
Shodan is the best fit when you need internet infrastructure intelligence: IP lookups, banners, ports, exposed services, screenshots, API enrichment, Monitor, bulk data, firehose access, and search-driven investigation.
Censys is the best fit when you need a more mature internet intelligence and ASM platform with structured global data, attack surface inventory, risk tracking, cloud connectors, dashboards, CVE context, and enterprise access controls.
The practical buying rule is simple: choose Surface Guard for simple monitored-domain EASM, Shodan for internet-wide search and enrichment, and Censys for enterprise internet intelligence plus ASM workflow. If your main need is verified-domain monitoring and remediation workflow, include ExternalSight in the evaluation as well.
Frequently asked questions
- SurfaceGuard vs Shodan vs Censys: which is best in 2026?
- Surface Guard is best for simpler EASM monitoring with visible public pricing. Shodan is best for infrastructure search, IP enrichment, and internet-wide service intelligence. Censys is best for enterprise internet intelligence and ASM workflows with inventory, risks, metrics, cloud connectors, and platform tiers.
- Is SurfaceGuard the same type of tool as Shodan?
- No. Surface Guard is positioned as an external attack surface monitoring product for monitored domains. Shodan is an internet infrastructure search and intelligence platform built around IPs, ports, banners, host data, APIs, Monitor, and enterprise data access.
- Is Censys more similar to Shodan or SurfaceGuard?
- Censys overlaps with Shodan on internet intelligence and global infrastructure data, but it also overlaps with Surface Guard through Censys Attack Surface Management. In practice, Censys is closer to an enterprise internet intelligence and ASM platform.
- Which tool has the clearest public pricing?
- Surface Guard and Shodan have clearer public prices for several tiers. Surface Guard lists StartUp and Business monthly plans plus Custom. Shodan lists Membership, Freelancer, Small Business, Corporate, and Enterprise. Censys documents Free, Starter, Search, and Enterprise platform tiers, while ASM pricing should be verified through quote-based AUM packaging.
- Should I use Shodan or Censys for EASM?
- Use Shodan when you need search, IP enrichment, exposed-service research, or data feeds. Use Censys when you need broader internet intelligence plus ASM inventory, risks, dashboards, metrics, alerts, cloud connectors, and enterprise workflows.
References and further reading
- Surface Guard official website and pricing — https://surfaceguard.net/
- Shodan Book — platform and pricing overview — https://book.shodan.io/getting-started/platform/
- Shodan product comparison — https://enterprise.shodan.io/product-comparison
- Shodan Enterprise — https://enterprise.shodan.io/
- Shodan Developer API — https://developer.shodan.io/
- Shodan Monitor — https://monitor.shodan.io/
- Censys official website — https://censys.com/
- Censys Platform quick start guide — https://docs.censys.com/docs/platform-quickstart-guide
- Censys feature and data access tiers — https://docs.censys.com/docs/data-access-tiers-entitlements
- Censys ASM get started — https://docs.censys.com/docs/asm-get-started
- Censys ASM risks — https://docs.censys.com/docs/asm-risks
- Censys ASM metrics — https://docs.censys.com/docs/asm-metrics
- Censys ASM CVE risks — https://docs.censys.com/docs/asm-cve-risks
- Censys ASM integrations — https://docs.censys.com/docs/integrations
Turn external exposure into owner-assigned security work
ExternalSight helps teams scan internet-facing domains, classify external findings, generate remediation plans, compare scan history, receive alerts, export reports, review scan coverage, and monitor verified domains on supported plans. Use it when your evaluation criteria include external visibility, remediation workflow, drift detection, and verified-domain monitoring.