Cloud-native cybersecurity platform providing vulnerability management, detection and response, and security analytics.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesApplication Security TestingThe Top 10
The absolute best in application security testing
Dell Technologies subsidiary providing managed security and threat intelligence services through Taegis XDR platform.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesApplication Security Testing
Cybersecurity advisory and assessment firm specializing in compliance, risk management, and security testing.
Top Rated15+ YearsMid-Size
Cybersecurity ServicesApplication Security Testing
Offensive security services platform providing pentest-as-a-service with access to a vetted community of security researchers for app testing.
Top Rated10+ YearsEnterprise
Application Security Testing
AI-powered cloud-native cybersecurity platform providing endpoint protection, threat intelligence, and incident response services.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesApplication Security Testing
Elite threat intelligence and incident response firm, now part of Google Cloud Security.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesApplication Security Testing
Cyber advisory and solutions leader delivering strategic and technical cybersecurity expertise across all major industries.
Top Rated10+ YearsEnterprise
Cybersecurity ServicesApplication Security Testing
Comprehensive cybersecurity platform provider specializing in network security, cloud security, and AI-driven security operations.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesApplication Security Testing
Cloud-based IT security and compliance platform with web application scanning (WAS) for automated DAST and API security testing.
Top Rated15+ YearsEnterprise
Application Security Testing
National professional services firm providing data engineering services including migration, cloud warehousing, and analytics consulting.
Top RatedMicrosoft PartnerSalesforce Partner+2 more
Data Engineering & Modern Data StackBusiness Intelligence ConsultingTop 10 Application Security Testing Agencies — FAQ
Common questions about the best application security testing agencies.
Who is the #1 application security testing agency in the USA in 2026?
As of 2026, the top-ranked application security testing agency in the USA on AgencyCluster is Rapid7, with an AgencyCluster Score of 100/100. Rankings are based on verified evidence across credibility, proof of work, reputation, category specialization, delivery maturity, and freshness. Rankings are updated periodically as new evidence becomes available.
How were the top 10 application security testing agencies in the USA selected?
This list features 10 agencies selected from AgencyCluster's curated directory. Each agency was evaluated using the AgencyCluster Score (0–100), with particular weight on demonstrated expertise in application security testing. Only agencies with verified credentials are eligible, and rankings cannot be purchased. The agencies on this list average 25+ years of experience. For full methodology details, see our How We Rank page.
What should I look for when choosing a application security testing agency from this list?
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 do the top application security testing agencies typically charge?
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.
Trusted Rankings
Every agency on this list has been reviewed by our editorial team. Rankings are based on our transparent methodology which evaluates credibility, outcomes, and reputation.
No paid rankingsVerified credentialsUpdated regularly
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