Top 50 Application Modernization Companies in Illinois
The Best of December 2025Looking for a top legacy modernization service in Illinois?
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 Illinois. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best Illinois Enterprise Application Modernization Services
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1$25,000+250 - 999 employeesChicago, ILRead More
Software development firm SPR was established in 1973. The midsize team specializes in custom software development, enterprise app modernization, cloud consulting & SI, ux/ui design, and more. The company is headquartered in Chicago, Illinois and Milwaukee, Wisconsin.
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2$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 -
3$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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4$25,000+250 - 999 employeesChicago, ILApp development company Build BetterApp | Chicago’s Top Mobile App Development Company was launched in 2020. The midsize Chicago, Illinois-based team provides Mobile App Development, Enterprise App Modernization, and Low/No Code Development.Read More
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5$25,000+10 - 49 employeesRiverwoods, ILRead More
Insyte Consultancy Services is a software company of around 10 employees. Established in 2011, their headquarters is in Oak Park, Ill. They offer services in mobile app development, wearable app development, custom software development, and enterprise app modernization.
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TaxBuddy AppIndustries
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6$25,000+10 - 49 employeesChicago, ILTwinCore is a cloud consulting & SI company based in Chicago, Illinois. The small firm was founded in 2011. Their services include cloud consulting & SI, CRM consulting and SI, Custom Software Development, Web Development, and more.Read More
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n-treeIndustries
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7$25,000+10 - 49 employeesSchaumburg, ILRead More
Captivix, an IT strategy consulting company, was established in 2011. The small Schaumburg, Illinois-based team focuses on IT strategy consulting, ERP consulting and SI, custom software development, digital strategy, and more.
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8$25,000+10 - 49 employeesChicago, ILBusiness intelligence company Loadsys Consulting, Inc was launched in 2002. Their small team is located in Chicago, Illinois and provides BI & big data consulting & SI, Artificial Intelligence, Enterprise App Modernization, AI Consulting, and more.Read More
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All Star DeliveryIndustries
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9$25,000+10 - 49 employeesLoves Park, ILBased in Loves Park, Illinois, Ticomix is a small Enterprise App Modernization company. They specialize in Enterprise App Modernization, Custom Software Development, AI Agents, and AI Consulting and were launched in 2000.Read More
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10$10,000+250 - 999 employeesChicago, ILProgrammers - AI, Data & Software is a midsize artificial intelligence company based in Chicago, Illinois. They offer Artificial Intelligence, BI & big data consulting & SI, Custom Software Development, Generative AI, and more and were founded in 1990.Read More
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11Undisclosed250 - 999 employeesMettawa, ILRead More
ES99 is a branding company launched in 1999. They are in Chicago, Illinois and have a midsize team. Their services include branding, advertising, direct marketing, market research, and more.
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12$5,000+50 - 249 employeesSkokie, ILRead More
Hoff & Mazor is a midsize application development firm. They provide mobile app development, enterprise app modernization, wearable app development, and other application development and were established in 2015. The firm is headquartered in Casper, Wyoming.
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13$5,000+10 - 49 employeesChicago, ILLaunched in 2020, Kumo Partners is a small Chicago, Illinois-based Enterprise App Modernization company. Their services include Enterprise App Modernization and IT strategy consulting.Read More
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14$5,000+50 - 249 employeesLibertyville, ILBitovi, an Enterprise App Modernization company, is based in Libertyville, Illinois. They specialize in Enterprise App Modernization and Custom Software Development and were launched in 2007.Read More
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15Undisclosed10,000+ employeesChicago, ILFounded in 1993, Thoughtworks Software Technologies Ltd is a large Chicago, Illinois-based AI company. Their team offers Artificial Intelligence and IT managed services.Read More
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16$10,000+10 - 49 employeesBartlett, ILPi9 is an Enterprise App Modernization company located in Ruislip, England and Bartlett, Illinois. They provide Enterprise App Modernization and BI & big data consulting & SI and were founded in 2013.Read More
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17$25,000+50 - 249 employeesSchaumburg, ILPSC Group, a custom software development company, provide Custom Software Development and Enterprise App Modernization. They were launched in 1990.Read More
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18$100,000+50 - 249 employeesNaperville, ILEgen is an IT strategy consulting company. They were established in 2002 and offer IT strategy consulting and cloud consulting & SI.Read More
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19$10,000+10 - 49 employeesChicago, ILAi2 is a small software development firm established in 1982. Their services include Custom Software Development and Enterprise App Modernization.Read More
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20$25,000+10 - 49 employeesChicago, ILOne Six Solutions is a business intelligence company. They were founded in 2013, and their services include BI & big data consulting & SI and Enterprise App Modernization.Read More
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21$100,000+10 - 49 employeesChicago, ILSoftware development firm Focused was launched in 2018. The team specializes in Custom Software Development and Mobile App Development and is based in Chicago, Illinois and Denver, Colorado.Read More
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22$5,000+50 - 249 employeesItasca, ILIntegrative Systems is a midsize IT managed services company headquartered in Itasca, Illinois and Pune, India. Their services include IT managed services and IT staff augmentation.Read More
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FollettIndustries
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23$5,000+1,000 - 9,999 employeesOak Brook, ILCIeNET Technologies, a large custom software development company, is in Beijing, China and Oak Brook, Illinois. Their services include Custom Software Development and Enterprise App Modernization.Read More
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24Undisclosed50 - 249 employeesLombard, ILPolaris Solutions, LLC is an IT managed services company founded in 2008. The agency provides IT managed services and Custom Software Development.Read More
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25$5,000+50 - 249 employeesWestmont, ILRSTAR Technologies is a CRM consulting and SI company. The Westmont, Illinois-based agency was launched in 2000. Their team provides CRM consulting and SI and ERP consulting and SI.Read More
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Exelon CorporationIndustries
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26$10,000+10 - 49 employeesSouth Barrington, ILAptlyLabs Inc is a small software development company. They offer Custom Software Development and Web Development and were launched in 2018.Read More
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27$1,000+10 - 49 employeesDeerfield, ILGiant Star AI is an UX agency located in Deerfield, Illinois. They specialize in UX/UI Design and Custom Software Development.Read More
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28$10,000+10 - 49 employeesChicago, ILCompoze Labs, a software development company, was established in 2015. The small Minneapolis, Minnesota-based team offers Custom Software Development, Artificial Intelligence, Mobile App Development, AI Consulting, and more.Read More
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Swire Coca-ColaIndustries
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29$250,000+50 - 249 employeesChicago, ILHeadquartered in Chicago, Illinois, ForceIQ is a midsize cloud consulting & SI company. The team specializes in cloud consulting & SI and CRM consulting and SI.Read More
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30$50,000+50 - 249 employeesChicago, ILRead More
Grape Up is a tech consulting company based in Cracow, Poland with no more than 250 employees. Founded in 2006, they provide custom software development, cloud consulting, and IT staff augmentation services for enterprise-level and mid-market clients alike.
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Porsche AGIndustries
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