Bespoke software development services trusted by Facebook and United Health with expertise in AI, cloud, and data engineering.
Top RatedGoogle PartnerAWS Partner+3 more
Custom Software DevelopmentData Engineering & AnalyticsTop 10 Elite
The very best agencies • View detailed Top 10
Agencies 11–25
Strong contenders and rising stars
Digital transformation consultancy delivering custom mobile apps and enterprise solutions for Fortune 500 companies since 2007.
Top Rated15+ YearsMid-Size
Custom Software DevelopmentStaff Augmentation / Dedicated Teams
Leading mobile app development company with 1200+ professionals delivering digital transformation for Fortune 500 companies globally.
Top Rated10+ YearsEnterprise
Mobile App DevelopmentMVP Development
Global digital engineering with 500+ employees, ISO/SOC 2 certified, offering AI/ML, cloud, and full-stack development services.
Top RatedGoogle PartnerAWS Partner+3 more
Custom Software Development
Ukraine-based with US presence specializing in web and mobile app development with React, Node.js, Python, and comprehensive testing.
Top Rated10+ YearsSmall Team
Custom Software Development
Full-cycle software development company delivering custom solutions for startups and enterprises with focus on quality and innovation.
Top Rated10+ YearsMid-Size
Custom Software Development
Custom mobile and web applications for startups and enterprises with 100+ IT experts delivering from concept to maintenance.
Top Rated10+ YearsMid-Size
Custom Software Development
Team of 100+ innovators handling complex software development with strong portfolio in web and mobile applications.
Top Rated15+ YearsMid-Size
Custom Software Development
Most trusted company for custom healthcare software solutions, design, and custom services for healthcare industry clients.
Top Rated10+ YearsMid-Size
Custom Software Development
Veteran-owned Oregon business specializing in custom software with roots in Northwest development and PHP expertise.
Top Rated5+ YearsBoutique
Custom Software Development
Global digital development company with 1,500+ professionals delivering custom software, AI, cloud, and cybersecurity solutions.
Top RatedGoogle PartnerAWS Partner+4 more
Custom Software DevelopmentProduct Engineering (SaaS)
Boutique development specializing in custom web applications, AI-based solutions, and data-intensive platforms with .NET and React.
Top Rated10+ YearsMid-Size
Custom Software Development
Atomic Object is a U.S.-based custom software development agency creating human-centered web, mobile, desktop, and cloud products that drive real business value.
Top Rated15+ YearsMid-Size
Custom Software DevelopmentAI/ML Development
Global IT services company providing mainframe modernization with AWS Premier Consulting Partner status and proprietary UniKix rehosting software for up to 70% cost savings.
Top Rated15+ YearsEnterprise
App Modernization & Legacy MigrationLegacy Modernization
Ksolves is a global software development, cloud solutions, and Salesforce Platinum Summit Partner that delivers custom application development, digital transformation, and enterprise technology services.
Top RatedGoogle PartnerAWS Partner+4 more
Salesforce Consulting & DevelopmentData Engineering & AnalyticsComplete Top 25 Custom Software Development Agencies
Full numbered list of all 25 agencies
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Complete Top 25 Custom Software Development Agencies
Full numbered list of all 25 agencies
- 1.ELEKS — Illinois
- 2.EPAM Systems — Pennsylvania
- 3.Simform — Florida
- 4.Stateside Agency — California
- 5.ScienceSoft — Texas
- 6.Andersen — New York
- 7.BairesDev — California
- 8.Agency Partner Interactive — Texas
- 9.Iron Forge Development — Georgia
- 10.SimbirSoft — Massachusetts
- 11.Azumo — California
- 12.Intellectsoft — California
- 13.Appinventiv — New York
- 14.Capital Numbers — New York
- 15.Gearheart — California
- 16.Itexus — Colorado
- 17.Tallium — Florida
- 18.CodeBright — California
- 19.HTDHealth — New York
- 20.IronGlove Studio — Oregon
- 21.10Pearls — Virginia
- 22.Honeycomb Software — Texas
- 23.Atomic Object — Michigan
- 24.NTT DATA — Texas
- 25.Ksolves — Wyoming
Top 25 Custom Software Development Agencies — FAQ
Common questions about the best custom software development agencies.
Who is the #1 custom software development agency in the USA in 2026?
As of 2026, the top-ranked custom software development agency in the USA on AgencyCluster is ELEKS, 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 custom software development 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 custom software development. 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 custom software development agency from this list?
Prioritize agencies that lead with a discovery phase before quoting. Ask how they handle requirements changes mid-project. Request references from clients with similar complexity (not just similar industry). Check if they provide architecture documentation and whether they've built systems that have scaled in production.
How much do the top custom software development agencies typically charge?
Custom enterprise software projects typically range from $100K–$1M+. Smaller internal tools or integrations may start at $50K. Post-launch support and iteration usually costs $10K–$40K/month.
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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