Cyber exposure management platform provider specializing in vulnerability assessment and management.
Top Rated15+ YearsLarge Team
Cybersecurity ServicesApplication Security TestingTop 10 Elite
The very best agencies • View detailed Top 10
Agencies 11–25
Strong contenders and rising stars
Managed security services provider specializing in threat detection, incident response, and compliance-focused security.
Top Rated15+ YearsMid-Size
Cybersecurity ServicesApplication Security Testing
Crowdsourced security platform providing managed bug bounty programs, PTaaS, and vulnerability disclosure for application security testing.
Top Rated10+ YearsEnterprise
Application Security Testing
Leading bug bounty and PTaaS platform connecting organizations with vetted global security researchers for application vulnerability testing.
Top Rated10+ YearsLarge Team
Application Security Testing
Cloud-native application security platform consolidating SAST, SCA, DAST, API security, and IaC scanning for enterprise DevSecOps workflows.
Top Rated15+ YearsEnterprise
Application Security Testing
Enterprise application security platform unifying DAST, SAST, SCA, API security, and ASPM with proprietary proof-based scanning technology.
Top Rated5+ YearsMid-Size
Application Security Testing
Proactive cybersecurity firm specializing in enterprise-scale penetration testing, attack surface management, and breach simulation services.
Top Rated15+ YearsEnterprise
Application Security Testing
Developer-first security platform with SAST, SCA, container security, and IaC scanning to find and fix vulnerabilities in code workflows.
Top Rated10+ YearsEnterprise
Application Security Testing
Premier security testing platform combining AI-powered automation and elite ethical hackers for continuous penetration testing at scale.
Top Rated10+ YearsLarge Team
Application Security Testing
AI-powered application security platform offering SAST, DAST, SCA, and IAST to help organizations find and fix vulnerabilities across the SDLC.
Top Rated15+ YearsEnterprise
Application Security Testing
Enterprise application security platform offering SAST, DAST, SCA, and ASPM — a Gartner Magic Quadrant Leader for AppSec testing.
Top Rated15+ YearsEnterprise
Application Security Testing
Offensive cybersecurity company offering continuous penetration testing, red teaming, and attack surface management via its Chariot platform.
Top Rated15+ YearsMid-Size
Application Security Testing
Offensive security consulting firm blending expert penetration testing with continuous attack-surface management for enterprise clients.
Top Rated15+ YearsLarge Team
Application Security Testing
AI-powered API security platform providing runtime protection, API discovery, and behavioral analytics to stop API-based attacks.
Top Rated10+ YearsMid-Size
Application Security Testing
Unified API protection platform combining automated discovery, business logic vulnerability testing, and runtime security for applications.
Top Rated10+ YearsMid-Size
Application Security TestingComplete Top 25 Application Security Testing Agencies
Full numbered list of all 25 agencies
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Complete Top 25 Application Security Testing Agencies
Full numbered list of all 25 agencies
- 1.Rapid7 — Massachusetts
- 2.Secureworks — Georgia
- 3.Coalfire — Illinois
- 4.Cobalt — California
- 5.CrowdStrike — Texas
- 6.Mandiant (Google Cloud) — California
- 7.Optiv Security — Colorado
- 8.Palo Alto Networks — California
- 9.Qualys — California
- 10.RSM US — Illinois
- 11.Tenable — Maryland
- 12.Trustwave — Illinois
- 13.Bugcrowd — California
- 14.HackerOne — California
- 15.Checkmarx — New Jersey
- 16.Invicti Security — Texas
- 17.NetSPI — Minnesota
- 18.Snyk — Massachusetts
- 19.Synack — California
- 20.Veracode — Massachusetts
- 21.Black Duck (Synopsys) — Massachusetts
- 22.Praetorian — Texas
- 23.Bishop Fox — Arizona
- 24.Salt Security — California
- 25.Cequence Security — California
Top 25 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 25 application security testing agencies in the USA selected?
This list features 25 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 20+ 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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