Top 100 Application Modernization Companies in the United States
The Best of December 2025Looking for a top legacy modernization service in the United States?
Application modernization companies can help create new business value from existing applications. Finding the right company to partner with, however, can be an overwhelming process.
To assist you in your search for a partner, we’ve compiled this list of the top application modernization services in United States. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best United States Enterprise Application Modernization Services
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61Undisclosed50 - 249 employeesNorfolk, VARead More
Martian Craft is a user experience design company established in 2010. The company provides ux/ui design, cloud consulting & SI, custom software development, web development, and more and has a midsize team.
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AppleIndustries
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62$10,000+1,000 - 9,999 employeesPrinceton, NJCygnet.One is a large Product Design company. In Princeton, New Jersey; Ahmedabad, India; Dubai, United Arab Emirates and Cape Town, South Africa, the company was founded in 2000. Their services include Product Design, IT staff augmentation, Custom Software Development, Web Development, and more.Read More
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B-Cam LtdIndustries
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63$10,000+50 - 249 employeesChicago, ILRead More
Alligatortek is a software company headquartered in Chicago with an office in Oakbrook Terrace, Ill. Since 1993, their team of 59 has lent its services in custom software development, mobile app development, and cloud consulting & SI. They specialize in Azure, and have experience in working with frameworks such as .NET, AngularJS, and React Native.
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Feeding America -
64$250,000+50 - 249 employeesHouston, TXRead More
ChaiOne is a mobile app development studio that was founded in 2008. ChaiOne has a team of about 50 spread between its Houston and Austin, Texas locations. ChaiOne does app development, UI/UX design, enterprise app modernization, digital strategy, and internet of things solutions. They serve large enterprise clients, particularly in the energy sector.
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ExxonMobilIndustries
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65$5,000+10 - 49 employeesSan Francisco, CARead More
Launched in 2020, Apex Lab is a software development company. Their small team is based in Tallinn, Estonia and San Francisco, California. Their team offers custom software development, mobile app development, web development, and enterprise app modernization.
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66$25,000+10 - 49 employeesAtlanta, GARead More
BlueFletch is a mobile development agency based in Atlanta founded in 2008. Their team of 38 experts specializes in mobile app development, custom software development, and enterprise app modernization for midmarket and large firms. They have experience working in the industries of retail, transportation, and consumer products & services, among others.
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The Home DepotIndustries
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67$25,000+10 - 49 employeesSpring, TXRead More
Software development firm Espresso Moon was established in 2004. Their small team is in Houston, Texas. Their services include custom software development, mobile app development, web design, and IT managed services.
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Nucor Steel Tesla Solvay MacomIndustries
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68$25,000+50 - 249 employeesWestport, CTLaunched in 2010, Quartus Technology, Inc. Is a mobile app development company. Their midsize team is based in Westport, Connecticut. Their team offers Mobile App Development, UX/UI Design, Custom Software Development, Web Development, and more.Read More
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Beaver Creek Dasher Lawless SwingU The Establishment 1898Industries
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69$25,000+10 - 49 employeesNew York, NYRead More
Def Method is a software development company based in New York City. Founded in 2014, the team of 21 specializes in custom software development, web development, IT staff augmentation, AI, and more. They work primarily with large and mid-sized businesses, focusing on financial services, real estate, and IT.
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Walmart -
70$50,000+50 - 249 employeesPortland, ORAltSource Software, a software development firm, is headquartered in Portland, Oregon and Lake Oswego, Oregon. The midsize team offers Custom Software Development, Digital Strategy, Web Development, Mobile App Development, and more. The firm was founded in 2004.Read More
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OHSUIndustries
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71$5,000+10 - 49 employeesPlymouth, MNRead More
Cirrius Solutions is a global technology Salesforce.com service company that has successfully completed over 250 successful Salesforce implementations. Specific areas of expertise include CRM consulting and SI, custom software development, enterprise app modernization, and IT strategy consulting. The team of 2-10 specialists provides marketing and sales automation, customer service, and social CRM solutions. Since its 2009 foundation, Cirrius Solutions has served clients local to its Minneapolis headquarters and internationally.
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Thomson ReutersIndustries
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72$50,000+1,000 - 9,999 employeesHouston, TXCelebal Technologies Americas Inc is an Enterprise App Modernization company. Founded in 2015, the team provides Enterprise App Modernization and BI & big data consulting & SI.Read More
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TE ConnectivityIndustries
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73$50,000+10 - 49 employeesNew York, NYRead More
Located in New York City, Lightmatter is an agency offering web and mobile app development, design, and other digital services. Their team of under 50 employees serves mostly enterprise businesses in industries like financial services, gaming, and healthcare. They were founded in 2013.
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NYU LangoneIndustries
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74$100,000+50 - 249 employeesLehi, UTRead More
Global software development company SolutionStream is headquartered in Lehi, UT with additional offices in Salt Lake City, UT and Scottsdale, AZ. SolutionStream mostly serves mid-market and enterprise clients in the education, financial services, and information technology industries. The team of about 100 employees provides custom software and mobile app development and UX/UI design.
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DomoIndustries
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75$50,000+10 - 49 employeesIrvine, CARead More
Company A is a custom application development company based in Irvine, Calif., with offices in Plano, Texas, and Novi Sad, Serbia. The company, founded in 2015, has a team of more than ten that provides cloud consulting & SI, custom software development, web development, mobile app development, and enterprise app modernization services. Company A serves small and larger-sized companies in various industries, including IT, financial services, and health care & medical.
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76$50,000+10 - 49 employeesOrlando, FLRead More
This Orlando, Fla. app development agency was founded in 2008. Echo Interaction Group has about 10 team members who specialize in various technological practices such as enterprise app modernization, wearables development, hardware integration, marketing, and UX/UI design.
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VOXX International -
77$10,000+10 - 49 employeesHouston, TXRead More
Optimum is a digital marketing firm based in Houston. Since 2014, the small team of 3+ has specialized in web development, IT consulting, e-commerce development, email marketing, and mobile app development.
Clients
TrumpFIndustries
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78$10,000+10 - 49 employeesHouston, TXRead More
Epicenter Consulting is a web and mobile development company based in New York, with an additional location in Houston. Founded in 2008, this company has 15 employees. Services provided by Epicenter Consulting include custom software development, enterprise app modernization, and UI/UX design for businesses of all sizes.
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Qualified HardwareIndustries
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79Undisclosed2 - 9 employeesSeattle, WARead More
Freelock LLC is a Seattle-based internet and web design firm that was founded in 2002. Freelock LLC's team of 5 employees works mainly with small- and mid-market sized clients but has experience working with large corporations as well. The firm specializes in web and UI/UX design along with e-commerce development.
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80$10,000+50 - 249 employeesCoral Springs, FLRead More
2am.tech, a software development firm, was launched in 2013. The midsize team focuses on custom software development, web development, mobile app development, e-commerce development, and more. The firm is based in Miami Gardens, Florida.
Industries
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81$25,000+10 - 49 employeesCanton, GARead More
WeGotCode.com is a custom software development firm launched in 2016. The company provides Custom Software Development, cloud consulting & SI, Web Development, Mobile App Development, and more and has a small team.
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82$10,000+2 - 9 employeesChicago, ILRead More
Since 2014 web and mobile app development agency LakeView Labs has served clients ranging from startups to Fortune 500 companies. The small team of fewer than 10 applies its skill in mobile app, software, web, and e-commerce development to help these clients build engaging digital products.
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OctothorpeIndustries
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83$5,000+2 - 9 employeesMission Viejo, CARead More
Calibec is a small custom software development firm. Founded in 2021, the team offers custom software development, web development, mobile app development, enterprise app modernization, and more. The agency is located in Mission Viejo, California.
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84$100,000+50 - 249 employeesNew York, NYRead More
Stride is a New York City-based software development company that embraces agile development practices. Founded in 2014, Stride has proven itself as product development experts, with experience with software, websites, e-commerce, mobile apps, and IoT.
Clients
SpotifyIndustries
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85$5,000+10 - 49 employeesSausalito, CARead More
Atricore is an agile Sausalito, California-based IAM product, services, and consulting company launched in 2007. Their team of IAM experts focuses on identity and access management orchestration and modernization, cybersecurity, and IT strategy consulting; with SaaS tools for cloud identity migration.
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86$25,000+2 - 9 employeesRound Rock, TXRead More
Fulcrum Dynamic is a small IT strategy consulting company located in Round Rock, Texas. The team provides IT strategy consulting, custom software development, web development, and mobile app development.
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87$25,000+10 - 49 employeesTruckee, CANew Leaders is a small custom software development company. They focus on Custom Software Development, UX/UI Design, E-Commerce Development, Mobile App Development, and more and were founded in 2007. The agency is in Truckee, California and Beijing City, China.Read More
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Appfolio.comIndustries
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88$50,000+10 - 49 employeesBellbrook, OHRead More
Sparkbox is a web design and development company based in Dayton, Ohio, with a satellite office in Pittsburgh. Founded in 2009, Sparkbox's team of 38 employees provides web design and development, e-commerce development, custom software development, and UX/UI design services for mainly midmarket businesses.
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Knoxville Utility BoardIndustries
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89$10,000+10 - 49 employeesSanta Monica, CARead More
Founded in 2005, Invemo is a tech company headquartered in Santa Monica with another location in IST, Turkey. Their team of 4 provide mobile app development, UX/UI design, IT strategy, and app modernization services to clients.
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Invemo created innovative solutions for Philips -
90$25,000+10 - 49 employeesColumbia, MORead More
QuarkWorks is a development agency located in San Francisco. Since 2011, their team of 15 has been specializing in mobile app development, web development, product design, and more for enterprise and midmarket-level clients.
Clients
Eventbrite
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