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Subra

Best Subra Alternatives & Competitors in 2026

Top picks: Assetnote Attack Surface Management Tool, Detectify Platform, Detectify Surface Monitoring — plus 45 more compared.

Evaluating Subra alternatives comes down to matching Attack Surface capabilities to your environment, integrations, and budget rather than chasing feature parity. The options below are compared on what actually drives a switch: coverage, deployment fit, pricing, and real reviews from security teams. Independent and vendor-neutral: we never sell rankings.

Subra Alternatives and Competitors

Subra is a free External Attack Surface Management tool. Security professionals most commonly compare it with Assetnote Attack Surface Management Tool, Detectify Platform, Detectify Surface Monitoring, Halo Security Attack Surface Discovery, and Intruder Discover Attack Surface. All 48 alternatives are matched by shared capabilities, tags, and NIST CSF 2.0 coverage.

Looking for free options across categories? See our curated roundup of attack surface tools and other open source picks→ Free & Open Source Tools

Data verified Jul 2026

View Subra All Attack Surface Compare Stacks Market Map Explore All Tools

TrustPin — Certificate pinning platform with remote updates & multi-platform SDKs.Visit

Top Subra Alternatives and Competitors at a Glance

A closer look at the 8 most relevant alternatives and competitors to Subra, including their key features and shared capabilities.

Assetnote Attack Surface Management Tool

Commercial

External Attack Surface Management

ASM platform that scans external attack surfaces hourly for vulnerabilities

Key features: Hourly automated scanning of external assets, Asset and subdomain discovery from seed domains, Automated asset enrichment with version verification, Detection of vulnerabilities and cloud misconfigurations, Zero-day vulnerability research and early notification

View Assetnote Attack Surface Management Tool|Assetnote Attack Surface Management Tool alternatives|Compare Assetnote Attack Surface Management Tool

Detectify Platform

Commercial

External Attack Surface Management

Platform for external attack surface management and application security testing

Key features: Automatic external attack surface discovery and mapping, Continuous monitoring for DNS misconfigurations and subdomain takeovers, API discovery and dynamic API security testing, Authenticated application scanning with crawling and fuzzing, Custom security policy enforcement across attack surface

View Detectify Platform|Detectify Platform alternatives|Compare Detectify Platform

Detectify Surface Monitoring

Commercial

External Attack Surface Management

Monitors internet-facing subdomains for vulnerabilities and misconfigurations

Key features: Automatic subdomain discovery and monitoring, Continuous vulnerability scanning, Payload-based security testing, Technology fingerprinting, Subdomain takeover detection

View Detectify Surface Monitoring|Detectify Surface Monitoring alternatives|Compare Detectify Surface Monitoring

Halo Security Attack Surface Discovery

Commercial

External Attack Surface Management

Discovers and inventories internet-facing assets including subdomains, IPs, and apps.

Key features: Subdomain and host discovery, IP and port scanning, Connected domain identification, Shadow infrastructure detection, Regular automated discovery scans

View Halo Security Attack Surface Discovery|Halo Security Attack Surface Discovery alternatives|Compare Halo Security Attack Surface Discovery

Intruder Discover Attack Surface

Commercial

External Attack Surface Management

Attack surface management platform for discovering and securing exposed assets

Key features: Subdomain discovery and enumeration, Automatic cloud asset discovery and scanning, Continuous network scanning, Exposed ports and services detection, Emerging threat scanning

View Intruder Discover Attack Surface|Intruder Discover Attack Surface alternatives|Compare Intruder Discover Attack Surface

Ceeyu Digital Footprint Monitoring

Commercial

External Attack Surface Management

Automated digital asset discovery and monitoring for external attack surface

Key features: Automatic digital asset discovery, Continuous digital footprint scanning, Subdomain enumeration, Internet-facing asset identification, Shadow IT detection

View Ceeyu Digital Footprint Monitoring|Ceeyu Digital Footprint Monitoring alternatives|Compare Ceeyu Digital Footprint Monitoring

Commercial

External Attack Surface Management

AI-powered EASM platform for digital asset discovery and monitoring.

Key features: Domain discovery and tracking, Subdomain discovery and tracking, AI-powered digital asset analysis, External attack surface visibility, Continuous asset monitoring

View Cylana EASM|Cylana EASM alternatives|Compare Cylana EASM

Threat Surface - Attack Surface Management

Commercial

External Attack Surface Management

EASM platform for continuous discovery and risk assessment of external assets.

Key features: Continuous automated asset discovery, Shadow IT and forgotten subdomain detection, Unmanaged cloud resource identification, CVSS-based vulnerability scoring, Contextual risk analysis and prioritisation

View Threat Surface - Attack Surface Management|Threat Surface - Attack Surface Management alternatives|Compare Threat Surface - Attack Surface Management

All 48 Alternatives & Competitors to Subra

Compare

Assetnote Attack Surface Management Tool

ASM platform that scans external attack surfaces hourly for vulnerabilities

External Attack Surface Management

Compare

Detectify Platform

Platform for external attack surface management and application security testing

External Attack Surface Management

Compare

Detectify Surface Monitoring

Monitors internet-facing subdomains for vulnerabilities and misconfigurations

External Attack Surface Management

Compare

Halo Security Attack Surface Discovery

Discovers and inventories internet-facing assets including subdomains, IPs, and apps.

External Attack Surface Management

Compare

Intruder Discover Attack Surface

Attack surface management platform for discovering and securing exposed assets

External Attack Surface Management

Compare

Ceeyu Digital Footprint Monitoring

Automated digital asset discovery and monitoring for external attack surface

External Attack Surface Management

Compare

AI-powered EASM platform for digital asset discovery and monitoring.

External Attack Surface Management

Compare

Threat Surface - Attack Surface Management

EASM platform for continuous discovery and risk assessment of external assets.

External Attack Surface Management

Compare

ThreatDefence Integrated ASM

ASM platform monitoring external attack surface, dark web leaks & 3rd-party risks.

External Attack Surface Management

Compare

Domain exposure monitoring tool for leaked creds, subdomains & dark web data.

External Attack Surface Management

Compare

AI-enhanced EASM platform for external attack surface discovery and monitoring.

External Attack Surface Management

Compare

Bash script for subdomain enumeration via crt.sh certificate transparency logs.

External Attack Surface Management

Free

Compare

A domain reconnaissance tool that automates subdomain discovery, port scanning, and monitoring with support for multiple data sources and notification integrations.

External Attack Surface Management

Free

Compare

Amass is an open-source OWASP tool for comprehensive attack surface mapping and asset discovery through domain reconnaissance and subdomain enumeration.

External Attack Surface Management

Free

Compare

Sublist3r is a python tool for enumerating subdomains using OSINT and various search engines.

External Attack Surface Management

Free

Compare

Python utility for testing the existence of domain names under different TLDs to find malicious subdomains.

External Attack Surface Management

Free

Compare

A multi-cloud DNS security tool that detects dangling DNS records and potential subdomain takeover vulnerabilities by scanning cloud infrastructure and DNS zones.

External Attack Surface Management

Free

Compare

Projectdiscovery.io | Chaos

A powerful enumeration tool for discovering assets and subdomains.

External Attack Surface Management

Free

Compare

A high-performance DNS stub resolver for bulk lookups and reconnaissance (subdomain enumeration)

External Attack Surface Management

Free

Compare

A subdomain enumeration tool for bug hunting and pentesting

External Attack Surface Management

Free

Compare

censys-subdomain-finder

A tool for performing subdomain enumeration using Censys API

External Attack Surface Management

Free

Compare

A Python-based tool for subdomain enumeration and analysis

External Attack Surface Management

Free

Compare

censys-enumeration

A script to extract subdomains/emails for a given domain using SSL/TLS certificate dataset on Censys.

External Attack Surface Management

Free

Compare

A tool for enumerating subdomains of a given domain

External Attack Surface Management

Free

Compare

An automation framework that runs multiple open-source subdomain bruteforcing tools in parallel using Docker Compose and custom wordlists.

External Attack Surface Management

Free

Compare

A subdomain scan tool that helps you find subdomains of a given domain.

External Attack Surface Management

Free

Compare

Fast passive subdomain enumeration tool

External Attack Surface Management

Free

Compare

A command-line tool for discovering domains and subdomains related to a target domain during reconnaissance activities.

External Attack Surface Management

Free

Compare

A subdomain finder tool

External Attack Surface Management

Free

Compare

A Python-based tool for external attack surface discovery and reconnaissance across large-scale networks, focusing on IP address and subdomain enumeration.

External Attack Surface Management

Free

Compare

A tool that finds more information about a given URL or domain by querying multiple data sources.

External Attack Surface Management

Free

Compare

A powerful tool for finding and exploiting subdomain takeover vulnerabilities

External Attack Surface Management

Free

Compare

autoSubTakeover

A tool to identify potential subdomain takeovers by checking if a CNAME record resolves to the scope address.

External Attack Surface Management

Free

Compare

A tool for taking a list of resolved subdomains and outputting any corresponding CNAMES en masse.

External Attack Surface Management

Free

Compare

A tool for detecting and taking over subdomains with dead DNS records

External Attack Surface Management

Free

Compare

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.

External Attack Surface Management

Compare

Cyber Exposure Manager

Cyber Exposure Manager: continuous visibility and remediation for external risk

External Attack Surface Management

Compare

Sn1per Professional 2026

Sn1per Professional 2026: automated penetration testing & attack surface management

External Attack Surface Management

Compare

Outpost24 External Attack Surface Management

Cloud platform for continuous visibility & mgmt of external attack surfaces

External Attack Surface Management

Compare

StrikeOne Attack Surfa

AI-powered attack surface management platform for cybersecurity monitoring

External Attack Surface Management

Compare

Hadrian Agentic AI

AI-powered platform for continuous attack surface discovery and pentesting

External Attack Surface Management

Compare

Microsoft Defender EASM

Discovers and monitors external-facing assets and vulnerabilities

External Attack Surface Management

Compare

Halo Security Attack Surface Management

External attack surface mgmt platform for discovering & monitoring assets

External Attack Surface Management

Compare

External attack surface management platform with continuous asset discovery

External Attack Surface Management

Compare

CloudSEK Attack Surface Management

External attack surface management platform for discovering digital assets

External Attack Surface Management

Compare

Censys Internet Map

Internet intelligence platform for asset discovery and attack surface mapping

External Attack Surface Management

Compare

SaaS platform for attack surface management and vulnerability detection

External Attack Surface Management

Compare

QuimeraX External Attack Surface Management

EASM platform for continuous monitoring of internet-exposed assets & vulnerabilities

External Attack Surface Management

Also compare alternatives to:

Assetnote Attack Surface Management Tool alternatives Detectify Platform alternatives Detectify Surface Monitoring alternatives Halo Security Attack Surface Discovery alternatives Intruder Discover Attack Surface alternatives Ceeyu Digital Footprint Monitoring alternatives Cylana EASM alternatives Threat Surface - Attack Surface Management alternatives ThreatDefence Integrated ASM alternatives ExposeLens alternatives TRaViS alternatives crt.sh alternatives

Compare Subra with:

Subra vs Assetnote Attack Surface Management Tool Subra vs Detectify Platform Subra vs Detectify Surface Monitoring Subra vs Halo Security Attack Surface Discovery Subra vs Intruder Discover Attack Surface Subra vs Ceeyu Digital Footprint Monitoring Subra vs Cylana EASM Subra vs Threat Surface - Attack Surface Management

Subra Alternatives FAQ

Common questions security professionals ask when evaluating alternatives and competitors to Subra.

What are the best alternatives to Subra?

The most popular alternatives to Subra include Assetnote Attack Surface Management Tool, Detectify Platform, Detectify Surface Monitoring, Halo Security Attack Surface Discovery, and Intruder Discover Attack Surface. These External Attack Surface Management tools offer similar capabilities and are frequently compared by security professionals evaluating their options.

How many alternatives to Subra are available?

There are 48 alternatives to Subra listed on CybersecTools, all within the External Attack Surface Management category. Each alternative is matched based on shared capabilities, tags, and NIST CSF coverage areas.

Is Subra free or commercial?

Subra is a free External Attack Surface Management tool. You can use it at no cost. Both free and commercial alternatives are available for comparison.

What type of tool is Subra?

Subra is a External Attack Surface Management tool within the broader Attack Surface category. It is used by security professionals for external attack surface management capabilities and can be compared against 48 similar tools.

Have more questions? Browse our categories or search for specific tools.

48 Best Subra Alternatives & Competitors (2026) | CybersecTools

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