Best OpenDoor Alternatives & Competitors in 2026

DNSAudit.io

Free DNS security scanner that checks domains for misconfigs and exposure.

Scilla

An information gathering tool for DNS, subdomains, ports, and directories enumeration.

cariddi

An automated reconnaissance tool that crawls domains to discover URLs and scan for exposed secrets, API keys, and sensitive files during security assessments.

RoboShadow OWASP ZAP Vulnerability Scanner

Web app & network vulnerability scanner integrating OWASP ZAP, Shodan & Nmap

Jsmon 2.0

JavaScript security scanner for detecting vulnerabilities in third-party scripts

Aikido EOL Scanner

Detects end-of-life and outdated software in code and containers

CyCognito Active Security Testing

Automated active security testing platform for external attack surfaces

LinksDumper

LinksDumper extracts links and endpoints from HTTP responses to support web application security testing and reconnaissance activities.

Guardian360 Quickscan WP Plugin

WordPress plugin for website security scanning via the Guardian360 API.

S3Scanner

S3Scanner is an open-source tool that scans S3 buckets across S3-compatible APIs to identify misconfigurations and security vulnerabilities.

Yasuo

A Ruby script that scans networks for vulnerable third-party web applications and front-ends with known exploitable security flaws.

KICS

KICS is an open-source Infrastructure as Code security scanner that detects vulnerabilities and misconfigurations through customizable queries and integrates with CI/CD pipelines.

CryptoLyzer

CryptoLyzer is a cryptographic protocol analyzer that examines TLS, SSL, SSH, and DNSSEC server implementations with fingerprinting capabilities and multiple output formats.

ssh-audit by jtesta

ssh-audit is a Python-based tool for auditing SSH server and client configurations to identify security weaknesses and ensure compliance with best practices.

Recog

A recognition framework for identifying products, services, operating systems, and hardware by matching fingerprints against network probes.

WhatWeb

A next-generation web scanner that identifies websites and recognizes web technologies, including content management systems, blogging platforms, and more.

ASH - The Automated Security Helper

ASH is an automated security scanning tool that integrates multiple open-source security scanners to perform preliminary security checks on code, infrastructure, and IAM configurations during development.

Naabu

A fast and reliable port scanner written in Go, designed for attack surface discovery in bug bounties and penetration testing.

sandmap

A CLI tool that enhances Nmap with 31 modules containing 459 scan profiles for streamlined network reconnaissance and security assessments.

FingerprintX

FingerprintX is a standalone utility for service discovery on open ports.

dirsearch

DirSearch is a simple tool for finding files and directories on a web server.

crawley

A Go-based web crawler that supports multiple protocols and authentication methods for systematic web resource discovery and collection.

getJS

A tool to quickly get all JavaScript sources/files

Injectus

A CRLF and open redirect fuzzer

Oralyzer

A security analysis tool that detects and analyzes open redirection vulnerabilities in web applications.

dom-red

A command-line script that tests multiple domains from a list for open redirect vulnerabilities and reports findings.

OpenRedireX

A fuzzer for detecting open redirect vulnerabilities

SSRFire

Automated SSRF finder with options for XSS and open redirects

Dalfox

Dalfox is an open-source automated XSS scanner that provides customizable scanning profiles and detailed reporting for cross-site scripting vulnerability detection.

kicks3

A security tool for discovering S3 bucket references in web content and testing buckets for misconfigurations.

second-order

Second-order subdomain takeover scanner

takeover

A tool for testing subdomain takeover possibilities at a mass scale.

BlackWidow

BlackWidow is a Python-based web application scanner that combines OSINT gathering with automated fuzzing to identify OWASP vulnerabilities in target websites.

Sucuri Website Malware Scanner

Website malware scanner with remote & server-side scanning capabilities

Intruder XSS Scanner

XSS vulnerability scanner for web apps and APIs with automated scanning

CHEQ Form Guard

Protects web forms from bots and fake users to prevent junk leads

CyberChecker

Automated web vulnerability scanner with 60+ security checks

Verisys Antivirus API

REST API service for scanning files/URLs for malware, viruses & NSFW content.

Perisai Web Scanner

Automated web scanner detecting vulnerabilities and HTTP security headers

Email Security Test by ImmuniWeb

A free online tool that tests email server security by evaluating server configurations

Website Privacy Test

Website privacy and security testing tool for cookie and third-party analysis

ImmuniWeb SSL Test

AI-powered platform for SSL/TLS security testing and compliance assessment

Bitdefender Link Checker

Free URL scanner that checks links for malware, phishing, and fraud threats

RoboShadow Mobile Network Scanner

Android app for scanning networks to identify security vulnerabilities

Cloudmersive Virus Scan

Cloud-based virus scan APIs for securing files, URLs, and content uploads with advanced anti-virus and malware scanning capabilities.

NMAP

Nmap is an essential network scanning tool used for network security auditing and status monitoring.

Dnscan

Dnscan is a DNS reconnaissance tool that performs DNS scans, DNS cache snooping, and DNS amplification attack detection.

Pagodo

Automate Google Hacking Database scraping and searching with Pagodo, a tool for finding vulnerabilities and sensitive information.