Searching for a top-rated application modernization services company to future-proof your business? Our directory provides industry-leading experts specializing in transforming legacy systems. With insights from verified client experiences and success stories, we make it easy for you to compare options based on location, budget, and hourly rates to find your next agency partner. 

Best App Modernization Services Agencies

7 Companies-Rankings updated: August 29, 2026

All mobile app development firms on DesignRush have been assessed for their expertise, portfolio, and verified client reviews. Some listings may be paid.

Application Modernization
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  • Brocoders

    Brocoders is on-demand technical team for SaaS products and midsize businesses.

    From MVP to production SaaS. Brocoders builds React and Node.js products, integrates AI and RAG systems, and modernizes legacy platforms. 96% client satisfaction rate...

    Top Services:

    • Software Development
    • Web Development
    • Mobile App Development
    • Staff Augmentation
    • Product Design
    • Show more
    Location
    Tallinn, Estonia
    Number of Employees
    50 - 99
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    29 Projects Listed

    Brocoders Services

    • Software Development
    • Web Development
    • Mobile App Development
    • Staff Augmentation
    • Product Design
    • UI/UX Design
    • AI Development
    • Cloud Consulting
    • Software Testing
    • Web Design
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • iFit
    • Wagepoint Inc.
    • Adact - Marketing Gamification Platform
    • Comtech LLC
    • Everypig
    • Backbone International
    • Beyond Green
    • GeniePad
    • Area Butler
    • Anuel Energy
    Data sourced from the agency's DesignRush profile

    Brocoders Reviews & Testimonials

    • Michelle Bowser
      Michelle Bowser Director of Technical Operations at iFit
      5.0★

      Staff Augmentation Review from Michelle Bowser

      Brocoders collaborated closely with the company's team and actively participated in the planning processes. (Verified by email)

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit WebsiteView Profile
    4.3 4.3 (1)

  • Serbyte

    More than a website, a growth engine.

    Serbyte Web Design & Development builds custom websites that function as growth systems, combining web design, Next.js development, SEO, analytics, lead capture, and automation to help businesses turn traffic into leads and sales...

    Top Services:

    • Web Design
    • SEO
    • Web Development
    • Software Development
    • UI/UX Design
    • Show more
    Location
    Kirkland, Washington
    Number of Employees
    Under 49
    Average Hourly Rate
    $75/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    6 Projects Listed

    Serbyte Services

    • Web Design
    • SEO
    • Web Development
    • Software Development
    • UI/UX Design
    • Digital Marketing
    • PPC
    • AI Development
    • Design Services
    • Mobile App Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Vets Choice Insurance
    • RC Concrete
    • Bespoke Tint & PPF
    • Entitled
    • Iron & Oak
    • Herbanatural CO
    Data sourced from the agency's DesignRush profile

    Serbyte Reviews & Testimonials

    • Kris Meyer
      Kris Meyer Owner at Bespoke Tint & PPF
      5.0★

      Small Businesses Website Development Review from Kris Meyer

      Austin rebuilt our website from the ground up and helped turn Bespoke Tint & PPF into one of the top tint brands in Bellevue. The work started with a full redesign of our website, including branding, copywriting, conversion improvements, mobile optimization, and development. The new site immediately performed better and generated more leads after launch.After the website launch, we continued working together on SEO, AI search optimization, paid advertising support, analytics, A/B testing, and ongoing marketing strategy. He also helped improve our review visibility, local search presence, and overall positioning online.What started as a website project became an ongoing growth partnership focused on increasing traffic, leads, and customer acquisition.

    • Jeff Egbert
      Jeff Egbert Review from Google
      5.0★

      Jeff Egbert's Review Sourced from Google

      Austin built or website fast.And it works flawless. And he is always available for you to answer any questions. Or solve any problems.great experience.

    • Uffy 666
      Uffy 666 Review from Google
      5.0★

      Uffy 666's Review Sourced from Google

      very innovative and solid work. this service is invaluable in the climate of an ever evolving digital landscape. will definitely be coming back again.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit WebsiteView Profile
    4.3 4.3 (1)
    5.0 5.0 (8)

  • Zealous System

    Passionate to Code Your Success

    Zealous System is an AI-powered technology partner delivering custom software, AI solutions, web and mobile apps, and enterprise platforms. As a software solutions provider, we serve startups and enterprises across healthcare, FinTech, logistics, education, manufacturing, and more...

    Top Services:

    • Software Development
    • Product Design
    • Web Development
    • eCommerce Development
    • WordPress Website Design
    • Show more
    Location
    Ahmedabad, India
    Number of Employees
    50 - 99
    Average Hourly Rate
    $20/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    22 Projects Listed

    Zealous System Services

    • Software Development
    • Product Design
    • Web Development
    • eCommerce Development
    • WordPress Website Design
    • Mobile App Development
    • AI Development
    • IoT
    • Blockchain
    • Managed Services
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Kerson Wallaw Consulting Firm Inc
    • Neil Patel Digital
    • Barber's Connect
    Data sourced from the agency's DesignRush profile

    Zealous System Reviews & Testimonials

    • Grzegorz Grabczak
      Grzegorz Grabczak Chief Executive Officer at DIGITAL-IMAGES
      5.0★

      Software Development Review from Grzegorz Grabczak

      We worked with Zealous System on an AI-powered fraud triage solution for one of our clients in the Europe financial services sector. The project involved a complex fraud investigation workflow where analysts were handling a large number of alerts and gathering information from multiple systems. Zealous System worked closely with us to understand the requirements, existing processes and expectations of the end client before moving into development. The team developed an AI-powered fraud triage agent that brings relevant information together, helps prioritise alerts and provides explainable recommendations while keeping human analysts involved in important decisions. What I appreciated was the team's ability to understand both the business and technical sides of the project. Communication was consistent, and they were responsive when requirements evolved during development and testing. The solution helped streamline the investigation process and reduce the amount of repetitive manual work involved in reviewing fraud alerts. Overall, we had a positive experience working with Zealous System. They were a reliable technology partner for us on this project, particularly given the complexity of introducing AI into a financial services environment.

    • DIPAK VAIDH
      DIPAK VAIDH Review from Google
      1.0★

      DIPAK VAIDH's Review Sourced from Google

      I visited Zealous System on 16th June 2025 for the walk-in interview announced on LinkedIn for interns/freshers in Python, PHP, WordPress, .Net, and QA roles. Despite clearly stating it was open for freshers, upon arrival, all Python candidates, including myself and my sister, were told they only accept those with prior experience, as interns are directly placed on live projects. This information was never mentioned in the post. The company blamed the marketing team for the misleading post. This experience wasted our valuable time, energy, and travel expenses. I urge the company to coordinate better internally and post accurate job/internship information to avoid misguiding freshers who genuinely seek opportunities.

    • Ravi Prajapati
      Ravi Prajapati Review from Google
      5.0★

      Ravi Prajapati's Review Sourced from Google

      Zealous System is outstanding when it comes to AI development! Their team helped us build a smart, AI-powered software solution that completely transformed how we manage data and customer interactions. They explained complex AI concepts in simple terms and delivered a solution that works flawlessly. From planning to post-launch support, everything was smooth and professional. Highly recommended if you're looking for reliable AI experts!

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit WebsiteView Profile
    4.3 4.3 (1)
    4.2 4.2 (66)

  • Drew Marketing Solutions

    Do It The Right Way

    Drew Marketing Solutions is an integrated marketing and communications company based in Nairobi, Kenya, focused on building data-driven growth systems for brands. The company combines strategic marketing, audience insights, creative execution, and performance optimization to help businesses achieve measurable...

    Top Services:

    • Digital Services
    • Digital Strategy
    • Creative Services
    • Web Design
    • Web Development
    • Show more
    Location
    Nairobi, Kenya
    Number of Employees
    Under 49
    Average Hourly Rate
    $25/hr

    Drew Marketing Solutions Services

    • Digital Services
    • Digital Strategy
    • Creative Services
    • Web Design
    • Web Development
    • UI/UX Design
    • eCommerce Development
    • Digital Marketing
    • SEO
    • Mobile App Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Claire Solar
    • POSCX Solutions
    • Dadacare
    • Decathlon
    • Laureland Homes
    Data sourced from the agency's DesignRush profile

    Drew Marketing Solutions Reviews & Testimonials

    • Washingtone Abukuse
      Washingtone Abukuse Review from Google
      5.0★

      Washingtone Abukuse's Review Sourced from Google

      Nice services. They leave nothing unturned. All problems are solved as long as they are noticed. They are knowledgeable, problem solving and outstanding. When it comes to reliability, i rate them a 5 star.I was impressed on how they worked on my websites.I recommend them to clients who needs timely delivery, flexible operations and above all, those who wished to rank at the top of other companies. Thank you Oscar. You are an amazing guy.

    • rpwc
      rpwc Review from Google
      5.0★

      rpwc's Review Sourced from Google

      Contacted the team after a referral from a friend. They handled our web design & development services, social media marketing and general digital marketing services. Impressed by their passion.

    • Lavy Dinning
      Lavy Dinning Review from Google
      5.0★

      Lavy Dinning's Review Sourced from Google

      We love the quality of services despite a few hiccups while setting up and also managing our restaurant's digital marketing presence.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit WebsiteView Profile
    5.0 5.0 (76)

  • NUS Technology

    We Build We Stay

    NUS Technology is a boutique software engineering partner with over 70 engineers based in Ho Chi Minh City. Since 2013, we have worked closely with product leaders and operators to design, build, and maintain the core systems their teams rely on every day...

    Top Services:

    • Mobile App Development
    • Software Development
    • Web Development
    • eCommerce Development
    • Show more
    Location
    Ho Chi Minh, Vietnam
    Number of Employees
    50 - 99
    Average Hourly Rate
    $25/hr
    Portfolios Count
    3 Projects Listed

    NUS Technology Services

    • Mobile App Development
    • Software Development
    • Web Development
    • eCommerce Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • MyID
    • Fountain
    • PursuitLab
    • Unito
    • Propmap
    • HelpfulCrowd
    Data sourced from the agency's DesignRush profile
    Visit WebsiteView Profile
    4.7 4.7 (6)

  • Gaazzeebo LLC

    Dream It. Done. We turn your vision into functional, enterprise product

    Gaazzeebo is a custom software development company that designs, builds, and ships tailored web and mobile applications, AI systems, and workflow automation for businesses of every size. Our Tampa-based, founder-led team turns complex operational problems into scalable software you actually own!...

    Top Services:

    • Software Development
    • Mobile App Development
    • AI Development
    • Web Design
    • eCommerce Development
    • Show more
    Location
    St. Petersburg, Florida
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000

    Gaazzeebo LLC Services

    • Software Development
    • Mobile App Development
    • AI Development
    • Web Design
    • eCommerce Development
    • Web Development
    • SEO
    • IT Services
    • Business Consulting
    • Digital Services
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Tattoo Learning Center
    • JVC Construction, Inc.
    • AZRezcue
    Data sourced from the agency's DesignRush profile
    Visit WebsiteView Profile

  • Woltrio

    Better Tech, Better Life

    Woltrio is a healthcare technology and software development company specializing in custom digital solutions for healthcare providers, health systems, and digital health organizations. It combines healthcare expertise with modern software engineering to develop secure, scalable, and compliant systems that...

    Top Services:

    • Software Development
    • Mobile App Development
    • AI Development
    • Software Testing
    • DevOps Consulting
    • Show more
    Location
    Rawalpindi, Pakistan
    Number of Employees
    Under 49
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    1 Project Listed

    Woltrio Services

    • Software Development
    • Mobile App Development
    • AI Development
    • Software Testing
    • DevOps Consulting
    • Cloud Consulting
    • eCommerce Development
    • Web Development
    • UI/UX Design
    • Web Design
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Acolide
    • AelaPro
    • BillingVista
    Data sourced from the agency's DesignRush profile
    Visit WebsiteView Profile
    5.0 5.0 (12)

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Rated 4.8 on Google and 4.7 on Trustpilot, DesignRush Agency Directory is a reliable resource for finding application modernization services companies. We owe this to our executive selection team, which follows a strict screening process when featuring agencies on the platform, assessing key performance indicators, like portfolio, client reviews, and industry reputation.

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DesignRush sustains a directory of over 30,000 agencies categorized by service category, location, expertise, and reviews. We build our database in two ways:

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