# s3viewer alternatives and competitors (2026) The closest s3viewer alternatives are [ctlogs.dev](https://cybersectools.com/tools/ctlogsdev), [Intruder Attack Surface Management](https://cybersectools.com/tools/intruder-attack-surface-management) and [Siemba EASM](https://cybersectools.com/tools/siemba-easm). Picking a s3viewer alternative comes down to fit: External Attack Surface Management coverage, your environment, your integrations and your budget. So each option below shows what it covers, how it deploys, its pricing model and the company behind it. 46 alternatives. Closest matches: ctlogs.dev, Intruder Attack Surface Management, Siemba EASM. ## The product [s3viewer](https://cybersectools.com/tools/s3viewer) A storage exploration tool that provides unified access to view publicly accessible Amazon S3 buckets, Azure Blob storage, FTP servers, and HTTP directory listings. Category: [Exposure & Vulnerability Management](https://cybersectools.com/categories/exposure-vulnerability-management) · Pricing model: Free Need the answer fast? [Best Attack Surface Management Solutions for Business](https://cybersectools.com/shortlists/best-attack-surface-solutions) picks Palo Alto Networks Cortex Xpanse, Microsoft Defender EASM, Mandiant Attack Surface Management and 4 more. ## s3viewer alternatives and competitors s3viewer is a free [External Attack Surface Management](https://cybersectools.com/categories/external-asm) solution. The closest matches by shared tags and NIST CSF 2.0 coverage are [ctlogs.dev](https://cybersectools.com/tools/ctlogsdev), [Intruder Attack Surface Management](https://cybersectools.com/tools/intruder-attack-surface-management), [Siemba EASM](https://cybersectools.com/tools/siemba-easm), [CyberXTron ShadowSpot](https://cybersectools.com/tools/cyberxtron-shadowspot), and [GoSecure Titan® Attack Surface Management](https://cybersectools.com/tools/gosecure-titanr-attack-surface-management). All 46 alternatives on this page are ranked the same way. Want a free option? See [free and open source exposure & vulnerability management solutions](https://cybersectools.com/free), plus free picks in other categories. ## The closest s3viewer alternatives These 8 solutions overlap most with s3viewer. Each one says what the product does and, when the overlap is big enough, which capabilities it shares. ### 1. [ctlogs.dev](https://cybersectools.com/tools/ctlogsdev) Fast Certificate Transparency search and JSON API for subdomain reconnaissance. [External Attack Surface Management](https://cybersectools.com/categories/external-asm) · Commercial Key features: Real-time Certificate Transparency Search, Automated Subdomain Enumeration, High-Performance REST JSON API, Wildcard & Fingerprint Matching, SSL/TLS Certificate History Tracking [ctlogs.dev alternatives](https://cybersectools.com/alternatives/ctlogsdev) · [s3viewer vs ctlogs.dev](https://cybersectools.com/compare/ctlogsdev-vs-s3viewer) ### 2. [Intruder Attack Surface Management](https://cybersectools.com/tools/intruder-attack-surface-management) Attack surface mgmt platform with vuln scanning and cloud security features [External Attack Surface Management](https://cybersectools.com/categories/external-asm) · Commercial Key features: 10 listed. See them on the [Intruder Attack Surface Management page](https://cybersectools.com/tools/intruder-attack-surface-management#features). [Intruder Attack Surface Management alternatives](https://cybersectools.com/alternatives/intruder-attack-surface-management) · [s3viewer vs Intruder Attack Surface Management](https://cybersectools.com/compare/intruder-attack-surface-management-vs-s3viewer) ### 3. [Siemba EASM](https://cybersectools.com/tools/siemba-easm) AI-driven EASM platform for discovering and monitoring external-facing assets [External Attack Surface Management](https://cybersectools.com/categories/external-asm) · Commercial Key features: 10 listed. See them on the [Siemba EASM page](https://cybersectools.com/tools/siemba-easm#features). [Siemba EASM alternatives](https://cybersectools.com/alternatives/siemba-easm) · [s3viewer vs Siemba EASM](https://cybersectools.com/compare/s3viewer-vs-siemba-easm) ### 4. [CyberXTron ShadowSpot](https://cybersectools.com/tools/cyberxtron-shadowspot) External attack surface management platform for asset discovery and risk detection [External Attack Surface Management](https://cybersectools.com/categories/external-asm) · Commercial Key features: 10 listed. See them on the [CyberXTron ShadowSpot page](https://cybersectools.com/tools/cyberxtron-shadowspot#features). [CyberXTron ShadowSpot alternatives](https://cybersectools.com/alternatives/cyberxtron-shadowspot) · [s3viewer vs CyberXTron ShadowSpot](https://cybersectools.com/compare/cyberxtron-shadowspot-vs-s3viewer) ### 5. [GoSecure Titan® Attack Surface Management](https://cybersectools.com/tools/gosecure-titanr-attack-surface-management) Discovers, monitors, and assesses external attack surface assets continuously. [External Attack Surface Management](https://cybersectools.com/categories/external-asm) · Commercial Key features: 7 listed. See them on the [GoSecure Titan® Attack Surface Management page](https://cybersectools.com/tools/gosecure-titanr-attack-surface-management#features). [GoSecure Titan® Attack Surface Management alternatives](https://cybersectools.com/alternatives/gosecure-titanr-attack-surface-management) · [s3viewer vs GoSecure Titan® Attack Surface Management](https://cybersectools.com/compare/gosecure-titanr-attack-surface-management-vs-s3viewer) ### 6. [Strobes Attack Surface Management](https://cybersectools.com/tools/strobes-attack-surface-management) Platform for continuous attack surface discovery, monitoring, and remediation [External Attack Surface Management](https://cybersectools.com/categories/external-asm) · Commercial Key features: 8 listed. See them on the [Strobes Attack Surface Management page](https://cybersectools.com/tools/strobes-attack-surface-management#features). [Strobes Attack Surface Management alternatives](https://cybersectools.com/alternatives/strobes-attack-surface-management) · [s3viewer vs Strobes Attack Surface Management](https://cybersectools.com/compare/s3viewer-vs-strobes-attack-surface-management) ### 7. [Edgescan Attack Surface Management (ASM)](https://cybersectools.com/tools/edgescan-attack-surface-management-asm) External attack surface management platform for asset discovery and monitoring [External Attack Surface Management](https://cybersectools.com/categories/external-asm) · Commercial Key features: 10 listed. See them on the [Edgescan Attack Surface Management (ASM) page](https://cybersectools.com/tools/edgescan-attack-surface-management-asm#features). [Edgescan Attack Surface Management (ASM) alternatives](https://cybersectools.com/alternatives/edgescan-attack-surface-management-asm) · [s3viewer vs Edgescan Attack Surface Management (ASM)](https://cybersectools.com/compare/edgescan-attack-surface-management-asm-vs-s3viewer) ### 8. [RiskProfiler - Attack Surface Management](https://cybersectools.com/tools/riskprofiler-attack-surface-management) AI-powered EASM platform for discovering and prioritizing external risks [External Attack Surface Management](https://cybersectools.com/categories/external-asm) · Commercial Key features: 10 listed. See them on the [RiskProfiler - Attack Surface Management page](https://cybersectools.com/tools/riskprofiler-attack-surface-management#features). [RiskProfiler - Attack Surface Management alternatives](https://cybersectools.com/alternatives/riskprofiler-attack-surface-management) · [s3viewer vs RiskProfiler - Attack Surface Management](https://cybersectools.com/compare/riskprofiler-attack-surface-management-vs-s3viewer) ## All 46 products like s3viewer The 8 above, plus: - [Cyber Exposure Manager](https://cybersectools.com/tools/galileo-security): Cyber Exposure Manager: continuous visibility and remediation for external risk (Commercial) - [Vulneri ASM](https://cybersectools.com/tools/vulneri-asm-attack-surface-management): ASM platform for continuous discovery and risk validation of internet-exposed assets. (Commercial) - [ThreatDefence Integrated ASM](https://cybersectools.com/tools/threatdefence-integrated-asm): ASM platform monitoring external attack surface, dark web leaks & 3rd-party risks. (Commercial) - [DarkInvader EASM Platform](https://cybersectools.com/tools/darkinvader-easm-platform) (Commercial) - [MGM Security Partners recon me](https://cybersectools.com/tools/mgm-security-partners-recon-me) (Commercial) - [Detectify Surface Monitoring](https://cybersectools.com/tools/detectify-surface-monitoring): Monitors internet-facing subdomains for vulnerabilities and misconfigurations (Commercial) - [MokN Lantern](https://cybersectools.com/tools/mokn-lantern): EASM platform for continuous external attack surface monitoring and detection (Commercial) - [DNS Assistant](https://cybersectools.com/tools/dns-assistant): DNS posture mgmt platform for real-time DNS & WHOIS change monitoring. (Commercial) - [Outpost24 External Attack Surface Management](https://cybersectools.com/tools/outpost24-external-attack-surface-management): Cloud platform for continuous visibility & mgmt of external attack surfaces (Commercial) - [StrikeOne Attack Surfa](https://cybersectools.com/tools/strikeone-attack-surfa): AI-powered attack surface management platform for cybersecurity monitoring (Commercial) - [Hadrian Agentic AI](https://cybersectools.com/tools/hadrian-agentic-ai): AI-powered platform for continuous attack surface discovery and pentesting (Commercial) - [Microsoft Defender EASM](https://cybersectools.com/tools/microsoft-defender-external-attack-surface-management): Discovers and monitors external-facing assets and vulnerabilities (Commercial) - [Halo Security Attack Surface Management](https://cybersectools.com/tools/halo-security-attack-surface-management): External attack surface mgmt platform for discovering & monitoring assets (Commercial) - [Assetnote ASM](https://cybersectools.com/tools/assetnote-asm): External attack surface management platform with continuous asset discovery (Commercial) - [CloudSEK Attack Surface Management](https://cybersectools.com/tools/cloudsek-attack-surface-management): External attack surface management platform for discovering digital assets (Commercial) - [Censys Attack Surface Management](https://cybersectools.com/tools/censys-attack-surface-management): Internet intelligence platform for asset discovery and attack surface mapping (Commercial) - [Risksurface](https://cybersectools.com/tools/risksurface): SaaS platform for attack surface management and vulnerability detection (Commercial) - [QuimeraX External Attack Surface Management](https://cybersectools.com/tools/quimerax-external-attack-surface-management): EASM platform for continuous monitoring of internet-exposed assets & vulnerabilities (Commercial) - [ThingsRecon Supply Chain Intelligence](https://cybersectools.com/tools/thingsrecon-supply-chain-intelligence): Supply chain intelligence platform mapping digital ecosystems & proximity risks (Commercial) - [RiskXchange Attack Surface Management](https://cybersectools.com/tools/riskxchange-attack-surface-management): Attack surface management platform for monitoring vulnerabilities and breaches (Commercial) - [Zerofox External Attack Surface Management](https://cybersectools.com/tools/zerofox-external-attack-surface-management): Discovers and manages internet-facing assets with vulnerability prioritization (Commercial) - [ImmuniWeb® Discovery](https://cybersectools.com/tools/immuniweb-discovery): ImmuniWeb Discovery is an attack surface management platform that continuously monitors an organization's external digital assets for security vulnerabilities, misconfigurations, and threats across domains, applications, cloud resources, and the dark web. (Commercial) - [Pentera Surface](https://cybersectools.com/tools/pentera-surface): External attack surface mgmt with automated pentesting and validation (Commercial) - [SOC Radar Attack Surface Management](https://cybersectools.com/tools/soc-radar-attack-surface-management): SOCRadar Attack Surface Management is an EASM platform that continuously discovers, monitors, and assesses internet-facing digital assets for vulnerabilities and security risks. (Commercial) - [Matos Automated Attack Surface Management](https://cybersectools.com/tools/cloudmatos-automated-attack-surface-management): Automated ASM tool for multi-cloud environments with continuous asset discovery (Commercial) - [Synack Attack Surface Discovery](https://cybersectools.com/tools/synack-attack-surface-discovery): External attack surface mgmt with asset discovery and on-demand pentesting (Commercial) - [Palo Alto Networks Cortex Xpanse](https://cybersectools.com/tools/palo-alto-networks-cortex-xpanse): Active attack surface mgmt solution for discovering & remediating unknown risks (Commercial) - [Team Cymru RADAR](https://cybersectools.com/tools/team-cymru-radar): Passive asset discovery platform using Netflow data for attack surface mapping (Commercial) - [Anomali Attack Surface Management](https://cybersectools.com/tools/anomali-attack-surface-management): External attack surface management platform for asset discovery and vuln mgmt (Commercial) - [Axur Unified EASM + CTI](https://cybersectools.com/tools/axur-unified-easm-cti): EASM platform with integrated CTI for asset discovery and vulnerability mgmt (Commercial) - [Cytrusst: Attack Surface Management (ASM)](https://cybersectools.com/tools/cytrusst-cyber-attack-surface-management): Cytrusst ASM is an attack surface management product that helps discover an organization's (Commercial) - [Wallarm API Attack Surface Management](https://cybersectools.com/tools/wallarm-api-attack-surface-management): Agentless API attack surface discovery and vulnerability detection platform (Commercial) - [NetSPI External Attack Surface Management (EASM)](https://cybersectools.com/tools/netspi-external-attack-surface-management-easm): Continuous discovery, monitoring, and testing of external assets and exposures (Commercial) - [Orpheus External Attack Surface Management](https://cybersectools.com/tools/orpheus-external-attack-surface-management): EASM platform with continuous asset discovery and threat intelligence context (Commercial) - [Red Sift Radar](https://cybersectools.com/tools/red-sift-red-sift-radar): LLM-powered security platform for finding and fixing security gaps (Commercial) - [Trickest ASM - Attack Surface Management](https://cybersectools.com/tools/trickest-asm-attack-surface-management): Customizable ASM platform for asset discovery, monitoring, and enrichment (Commercial) - [Criminal IP Security Scanning Service](https://cybersectools.com/tools/criminal-ip-security-scanning-service): Internet-connected asset search engine with vulnerability scanning capabilities (Commercial) - [CyCognito Contextualization](https://cybersectools.com/tools/cycognito-contextualization): Attack surface asset classification and contextualization platform (Commercial) ## Alternatives to each of these [ctlogs.dev alternatives](https://cybersectools.com/alternatives/ctlogsdev) · [Intruder Attack Surface Management alternatives](https://cybersectools.com/alternatives/intruder-attack-surface-management) · [Siemba EASM alternatives](https://cybersectools.com/alternatives/siemba-easm) · [CyberXTron ShadowSpot alternatives](https://cybersectools.com/alternatives/cyberxtron-shadowspot) · [GoSecure Titan® Attack Surface Management alternatives](https://cybersectools.com/alternatives/gosecure-titanr-attack-surface-management) · [Strobes Attack Surface Management alternatives](https://cybersectools.com/alternatives/strobes-attack-surface-management) · [Edgescan Attack Surface Management (ASM) alternatives](https://cybersectools.com/alternatives/edgescan-attack-surface-management-asm) · [RiskProfiler - Attack Surface Management alternatives](https://cybersectools.com/alternatives/riskprofiler-attack-surface-management) · [Cyber Exposure Manager alternatives](https://cybersectools.com/alternatives/galileo-security) · [Vulneri ASM alternatives](https://cybersectools.com/alternatives/vulneri-asm-attack-surface-management) · [ThreatDefence Integrated ASM alternatives](https://cybersectools.com/alternatives/threatdefence-integrated-asm) · [DarkInvader EASM Platform alternatives](https://cybersectools.com/alternatives/darkinvader-easm-platform) ## Compare s3viewer with - [s3viewer vs ctlogs.dev](https://cybersectools.com/compare/ctlogsdev-vs-s3viewer) - [s3viewer vs Intruder Attack Surface Management](https://cybersectools.com/compare/intruder-attack-surface-management-vs-s3viewer) - [s3viewer vs Siemba EASM](https://cybersectools.com/compare/s3viewer-vs-siemba-easm) - [s3viewer vs CyberXTron ShadowSpot](https://cybersectools.com/compare/cyberxtron-shadowspot-vs-s3viewer) - [s3viewer vs GoSecure Titan® Attack Surface Management](https://cybersectools.com/compare/gosecure-titanr-attack-surface-management-vs-s3viewer) - [s3viewer vs Strobes Attack Surface Management](https://cybersectools.com/compare/s3viewer-vs-strobes-attack-surface-management) - [s3viewer vs Edgescan Attack Surface Management (ASM)](https://cybersectools.com/compare/edgescan-attack-surface-management-asm-vs-s3viewer) - [s3viewer vs RiskProfiler - Attack Surface Management](https://cybersectools.com/compare/riskprofiler-attack-surface-management-vs-s3viewer) ## s3viewer Alternatives FAQ ### What are the closest alternatives to s3viewer? The closest matches to s3viewer by shared tags and NIST CSF 2.0 coverage are ctlogs.dev, Intruder Attack Surface Management, Siemba EASM, CyberXTron ShadowSpot, and GoSecure Titan® Attack Surface Management. All of them are External Attack Surface Management products. ### How many alternatives to s3viewer are available? This page shows 46 alternatives to s3viewer, all in the External Attack Surface Management category. Each one is matched on shared tags and NIST CSF 2.0 areas, and the closest matches rank first. ### Is s3viewer free or commercial? s3viewer is a free External Attack Surface Management product. You can use it at no cost. Only commercial alternatives are listed here. Free and open source products are under /free. ### What type of solution is s3viewer? s3viewer is a External Attack Surface Management product in the Exposure & Vulnerability Management category. You can compare it with the 46 other External Attack Surface Management products on this page. --- Source: https://cybersectools.com/alternatives/s3viewer For AI agents: every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md, and any product or compare page has a Markdown copy too (add .md to its URL). More on s3viewer and its alternatives: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=alternatives-md