Application Security Testing Agencies
Browse verified application security testing agencies. Find the perfect partner for your next project.
Showing 48 agencies
Agencies are shown in random order within quality tiers for fair visibility. Refresh for a new arrangement.
Tenable
📍 Maryland
Cyber exposure management platform provider specializing in vulnerability assessment and management.
HackerOne
📍 California
Leading bug bounty and PTaaS platform connecting organizations with vetted global security researchers for application vulnerability testing.
NetSPI
📍 Minnesota
Proactive cybersecurity firm specializing in enterprise-scale penetration testing, attack surface management, and breach simulation services.
Veracode
📍 Massachusetts
AI-powered application security platform offering SAST, DAST, SCA, and IAST to help organizations find and fix vulnerabilities across the SDLC.
Praetorian
📍 Texas
Offensive cybersecurity company offering continuous penetration testing, red teaming, and attack surface management via its Chariot platform.
Snyk
📍 Massachusetts
Developer-first security platform with SAST, SCA, container security, and IaC scanning to find and fix vulnerabilities in code workflows.
Trustwave
📍 Illinois
Managed security services provider specializing in threat detection, incident response, and compliance-focused security.
Invicti Security
📍 Texas
Enterprise application security platform unifying DAST, SAST, SCA, API security, and ASPM with proprietary proof-based scanning technology.
Rapid7
📍 Massachusetts
Cloud-native cybersecurity platform providing vulnerability management, detection and response, and security analytics.
Mandiant (Google Cloud)
📍 California
Elite threat intelligence and incident response firm, now part of Google Cloud Security.
CrowdStrike
📍 Texas
AI-powered cloud-native cybersecurity platform providing endpoint protection, threat intelligence, and incident response services.
Salt Security
📍 California
AI-powered API security platform providing runtime protection, API discovery, and behavioral analytics to stop API-based attacks.
Coalfire
📍 Illinois
Cybersecurity advisory and assessment firm specializing in compliance, risk management, and security testing.
Bugcrowd
📍 California
Crowdsourced security platform providing managed bug bounty programs, PTaaS, and vulnerability disclosure for application security testing.
Checkmarx
📍 New Jersey
Cloud-native application security platform consolidating SAST, SCA, DAST, API security, and IaC scanning for enterprise DevSecOps workflows.
Palo Alto Networks
📍 California
Comprehensive cybersecurity platform provider specializing in network security, cloud security, and AI-driven security operations.
Secureworks
📍 Georgia
Dell Technologies subsidiary providing managed security and threat intelligence services through Taegis XDR platform.
Optiv Security
📍 Colorado
Cyber advisory and solutions leader delivering strategic and technical cybersecurity expertise across all major industries.
Bishop Fox
📍 Arizona
Offensive security consulting firm blending expert penetration testing with continuous attack-surface management for enterprise clients.
Qualys
📍 California
Cloud-based IT security and compliance platform with web application scanning (WAS) for automated DAST and API security testing.
Synack
📍 California
Premier security testing platform combining AI-powered automation and elite ethical hackers for continuous penetration testing at scale.
RSM US
📍 Illinois
National professional services firm providing data engineering services including migration, cloud warehousing, and analytics consulting.
Black Duck (Synopsys)
📍 Massachusetts
Enterprise application security platform offering SAST, DAST, SCA, and ASPM — a Gartner Magic Quadrant Leader for AppSec testing.
Cobalt
📍 California
Offensive security services platform providing pentest-as-a-service with access to a vetted community of security researchers for app testing.
OpenText (Fortify)
📍 Texas
Enterprise AppSec-as-a-service platform providing SAST, DAST, and MAST through Fortify for scalable software security assurance programs.
Zimperium
📍 Texas
Enterprise mobile security platform providing mobile application security testing, threat defense, and runtime protection for apps and devices.
Sonatype
📍 Maryland
Software supply chain security company offering SCA, SBOM management, and open-source vulnerability analysis for application security.
StackHawk
📍 Colorado
Developer-centric DAST platform providing shift-left runtime security testing and attack surface discovery from source code for modern apps.
Imperva
📍 Texas
Cybersecurity company providing WAF, API security, bot management, and application security testing for enterprise web applications.
Rhino Security Labs
📍 Washington
Boutique penetration testing firm trusted by Fortune 1000 companies for deep-dive web, mobile, cloud, and network security assessments.
Traceable AI
📍 California
Full lifecycle API security platform using distributed tracing for deep visibility, testing, and runtime protection of application APIs.
Data Theorem
📍 California
Continuous API security testing and runtime protection platform specializing in mobile, web, and cloud application security analysis.
Core Security (Fortra)
📍 Minnesota
Offensive security solutions provider with 35+ years of penetration testing expertise using Core Impact for vulnerability validation.
Contrast Security
📍 California
Runtime application security platform embedding code analysis and attack prevention directly into the SDLC via patented instrumentation.
NowSecure
📍 Illinois
Mobile application security testing company offering automated MAST, penetration testing, and DevSecOps integration for mobile apps.
Offensive Security (OffSec)
📍 New York
Premier cybersecurity training and certification company offering hands-on penetration testing services and the industry-standard OSCP program.
QA Mentor
📍 New York
Full-service QA company providing comprehensive testing services including automation, mobile, and performance testing for diverse industries.
QASource
📍 California
Leading software QA outsourcing company offering AI-driven testing, automation, and manual QA services for startups to Fortune 500 companies.
Cequence Security
📍 California
Unified API protection platform combining automated discovery, business logic vulnerability testing, and runtime security for applications.
Quokka (formerly Kryptowire)
📍 California
Mobile security company providing defense-grade automated mobile application security testing and third-party app vetting solutions.
Security Innovation
📍 Massachusetts
Application security consulting firm providing software security assessments, penetration testing, and developer security training programs.
Semgrep (Return to Corp)
📍 California
Lightweight, customizable SAST platform for CI/CD pipelines providing fast code scanning with developer-friendly rules and low false positives.
Redbot Security
📍 Colorado
Boutique penetration testing firm with senior-level U.S.-based ethical hackers specializing in manual app and infrastructure security testing.
Evolve Security
📍 Illinois
Security testing firm combining real-world pentesting with security education via the Darwin Attack portal for ongoing vulnerability management.
Parasoft
📍 California
Software testing solutions provider with static analysis, API testing, and security-focused testing tools for enterprise application security.
BreachLock
📍 New York
PTaaS provider combining AI-powered automation with manual expert testing for on-demand application, network, and cloud pentesting.
Deepfactor
📍 California
Next-gen application security observability platform providing runtime analysis, SCA, and SBOM generation for cloud-native applications.
Mitnick Security
📍 Nevada
Boutique cybersecurity firm offering elite penetration testing services through the Global Ghost Team of senior security specialists.
Application Security Testing Agency FAQ
Common questions about finding and evaluating application security testing agencies.
What should I look for when hiring a application security testing agency?
Ask for case studies with measurable outcomes relevant to your specific project. Check team composition — do they have specialists or generalists? Ask about their communication cadence and project management approach. Request client references from companies of similar size and complexity to yours.
How much does it cost to hire a application security testing agency?
Project costs vary significantly based on complexity, team size, and engagement model. Request proposals from 3–5 agencies to benchmark pricing. Be cautious of quotes that are dramatically lower than others — they usually indicate corners being cut.
How long does a typical application security testing project take?
Timelines depend on project scope and complexity. A good agency will provide a phased delivery plan with clear milestones. Be wary of agencies that commit to aggressive timelines without a thorough discovery phase.
What are red flags when evaluating application security testing agencies?
No relevant case studies, inability to explain their process, quoting before understanding your requirements, no quality assurance practices, and reluctance to provide client references.
How many application security testing agencies are listed on AgencyCluster?
AgencyCluster currently lists 48 application security testing agencies, of which 48 have been fully verified. These agencies are located across 13 U.S. states. The current top-ranked application security testing agency is Rapid7 with a score of 100/100. Agencies are ranked using the AgencyCluster Score (0–100), which evaluates credibility, proof of work, reputation, category specialization, delivery maturity, and freshness.
All agencies are verified through our verification process. Know a great agency? Suggest an addition.