Security testing firm combining real-world pentesting with security education via the Darwin Attack portal for ongoing vulnerability management.
Top Rated10+ YearsMid-Size
Application Security TestingTop 10 Elite
The very best • View detailed Top 10
Agencies 11–25
Strong contenders • View detailed Top 25
#11
#12
#13
#14
#15
#16
#17
#18
#19
#20
#21
#22
#23
#24
#25
Tenable
Maryland
Trustwave
Illinois
Bugcrowd
California
HackerOne
California
Checkmarx
New Jersey
Invicti Security
Texas
NetSPI
Minnesota
Snyk
Massachusetts
Synack
California
Veracode
Massachusetts
Black Duck (Synopsys)
Massachusetts
Praetorian
Texas
Bishop Fox
Arizona
Salt Security
California
Cequence Security
California
Agencies 26–50
Quality agencies for deeper exploration
Mobile application security testing company offering automated MAST, penetration testing, and DevSecOps integration for mobile apps.
Top Rated15+ YearsMid-Size
Application Security Testing
Cybersecurity company providing WAF, API security, bot management, and application security testing for enterprise web applications.
Top Rated15+ YearsEnterprise
Application Security Testing
Software testing solutions provider with static analysis, API testing, and security-focused testing tools for enterprise application security.
Top Rated15+ YearsLarge Team
Application Security Testing
Application security consulting firm providing software security assessments, penetration testing, and developer security training programs.
Top Rated15+ YearsLarge Team
Application Security Testing
Continuous API security testing and runtime protection platform specializing in mobile, web, and cloud application security analysis.
Top Rated10+ YearsMid-Size
Application Security Testing
Leading software QA outsourcing company offering AI-driven testing, automation, and manual QA services for startups to Fortune 500 companies.
Top Rated15+ YearsEnterprise
QA & Test AutomationApplication Security Testing
Boutique cybersecurity firm offering elite penetration testing services through the Global Ghost Team of senior security specialists.
Top Rated15+ YearsSmall Team
Application Security Testing
Full-service QA company providing comprehensive testing services including automation, mobile, and performance testing for diverse industries.
Top Rated15+ YearsEnterprise
QA & Test AutomationApplication Security Testing
Mobile security company providing defense-grade automated mobile application security testing and third-party app vetting solutions.
Top Rated15+ YearsSmall Team
Application Security Testing
Software supply chain security company offering SCA, SBOM management, and open-source vulnerability analysis for application security.
Rising Star15+ YearsEnterprise
Application Security Testing
Developer-centric DAST platform providing shift-left runtime security testing and attack surface discovery from source code for modern apps.
Rising Star5+ YearsSmall Team
Application Security Testing
PTaaS provider combining AI-powered automation with manual expert testing for on-demand application, network, and cloud pentesting.
Rising Star5+ YearsMid-Size
Application Security Testing
Enterprise AppSec-as-a-service platform providing SAST, DAST, and MAST through Fortify for scalable software security assurance programs.
Rising Star15+ YearsEnterprise
Application Security Testing
Full lifecycle API security platform using distributed tracing for deep visibility, testing, and runtime protection of application APIs.
Rising Star5+ YearsMid-Size
Application Security Testing
Enterprise mobile security platform providing mobile application security testing, threat defense, and runtime protection for apps and devices.
Rising Star15+ YearsLarge Team
Application Security Testing
Runtime application security platform embedding code analysis and attack prevention directly into the SDLC via patented instrumentation.
Rising Star10+ YearsMid-Size
Application Security Testing
Offensive security solutions provider with 35+ years of penetration testing expertise using Core Impact for vulnerability validation.
Rising Star15+ YearsMid-Size
Application Security Testing
Boutique penetration testing firm with senior-level U.S.-based ethical hackers specializing in manual app and infrastructure security testing.
Rising Star10+ YearsBoutique
Application Security Testing
Premier cybersecurity training and certification company offering hands-on penetration testing services and the industry-standard OSCP program.
Rising Star15+ YearsEnterprise
Application Security Testing
Lightweight, customizable SAST platform for CI/CD pipelines providing fast code scanning with developer-friendly rules and low false positives.
Rising Star5+ YearsEnterprise
Application Security Testing
Boutique penetration testing firm trusted by Fortune 1000 companies for deep-dive web, mobile, cloud, and network security assessments.
Rising Star10+ YearsSmall Team
Application Security Testing
Next-gen application security observability platform providing runtime analysis, SCA, and SBOM generation for cloud-native applications.
5+ YearsSmall Team
Application Security TestingComplete Top 50 Application Security Testing Agencies
Full numbered list of all 48 agencies
Show listHide list
Complete Top 50 Application Security Testing Agencies
Full numbered list of all 48 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
- 26.Evolve Security — Illinois
- 27.NowSecure — Illinois
- 28.Imperva — Texas
- 29.Parasoft — California
- 30.Security Innovation — Massachusetts
- 31.Data Theorem — California
- 32.QASource — California
- 33.Mitnick Security — Nevada
- 34.QA Mentor — New York
- 35.Quokka (formerly Kryptowire) — California
- 36.Sonatype — Maryland
- 37.StackHawk — Colorado
- 38.BreachLock — New York
- 39.OpenText (Fortify) — Texas
- 40.Traceable AI — California
- 41.Zimperium — Texas
- 42.Contrast Security — California
- 43.Core Security (Fortra) — Minnesota
- 44.Redbot Security — Colorado
- 45.Offensive Security (OffSec) — New York
- 46.Semgrep (Return to Corp) — California
- 47.Rhino Security Labs — Washington
- 48.Deepfactor — California
Top 50 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 50 application security testing agencies in the USA selected?
This list features 48 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 19+ 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
Found an error? Submit a correction