18 Best App Modernization Companies (2026)

At Gilzor, we provide app modernization services for products that have become difficult to maintain, expand, or integrate with newer technologies. In many cases, the application still functions, but development gradually slows down because of outdated architecture, accumulated technical debt, or disconnected product structures. Our approach begins with reviewing the application from several perspectives, including architecture, user flows, business requirements, and long-term product goals, to determine which areas should be updated, rebuilt, or preserved.

Our work can include application restructuring, technology stack updates, performance improvements, API integrations, and preparation for new web and mobile use cases. We also combine app modernization with business analysis, UI/UX design, quality assurance, and ongoing support when broader product changes are required. The goal is to modernize applications in a controlled way that reduces unnecessary disruption, improves maintainability, and makes future development more efficient.

Rishabh Software works on application modernization for companies that need to move older software into a cleaner, more flexible setup. Their service covers legacy application assessment, cloud enablement, reengineering, UI/UX modernization, and refactoring monolithic systems into microservices.

The company handles modernization through discovery, planning, design, migration, transition, and later operations. Their team can review application architecture and code, extract business rules from older systems, and plan remediation where risks, backup, or recovery need attention.

Softura works with application modernization through a cloud-focused lens. They help companies review older applications, decide how much change is actually needed, and choose a modernization path that fits the application instead of forcing every system into the same model.

Softura places a lot of focus on cloud rationalization and staged migration. That makes sense for applications built for older on-premise environments, especially when direct migration is not enough because the architecture is too rigid or outdated. Softura can support modernization through cloud infrastructure, cloud-optimized applications, and cloud-native rebuilding, with Agile and DevOps used to make delivery more controlled.

Oski Solutions helps companies modernize legacy systems that have become harder to maintain, expand, or connect with newer tools. Their work is grounded in software engineering, cloud services, frontend development, backend development, AI/ML, and CMS development. Oski Solutions uses technologies such as .NET, Node.js, React, Vue, Angular, Azure, AWS, Docker, and CI/CD.

Oski Solutions can work on outdated software architecture, cloud migration, integrations, data flow, and system rebuilds. Their experience covers industries such as logistics, transportation, e-commerce, education, fintech, insurance, travel, and healthcare. They also work with Umbraco and WordPress, so modernization can include CMS-based platforms as well as custom business applications.

Serviots handles app modernization with a broad technical scope, covering old desktop systems, mainframe software, ASP.NET MVC applications, VB.NET systems, and cloud-ready platforms. Their focus is on moving outdated applications into setups that are easier to scale, secure, and connect with newer tools.

They have a fairly wide industry spread, including fintech, healthcare, eCommerce, logistics, EdTech, real estate, manufacturing, travel, SaaS, and the public sector. Serviots also pays attention to security and compliance during modernization, with areas such as zero-trust architecture, secure SDLC, encryption, IAM, cloud security, GDPR, HIPAA, and PCI-DSS.

A-listware is a UK-based IT consulting and software development company that supports application modernization. They work with legacy software that needs better performance, stronger security, cleaner scalability, or closer integration with newer platforms. Their model also includes setting up dedicated distributed agile teams, which can be useful when a company needs extra engineering capacity rather than a one-off modernization task.

Clear project coordination is part of how A-listware approaches modernization. They focus on communication, local oversight, and flexible team setup, which matters when older systems are connected to everyday business processes. A-listware can also support cloud and on-premises infrastructure, software consulting, team augmentation, and custom development, so modernization can be handled as part of a larger technical update.

Itransition provides application modernization services for companies that need to update existing software without losing the business logic already built into it. Their services cover application re-architecting, migration, containerization, refactoring, UX/UI redesign, integration, and functionality customization.

Modernization at Itransition can include both targeted changes and larger renovation work. They assess legacy systems, review code and dependencies, choose a modernization model, test the updated application, and provide post-modernization support. Itransition also brings in advanced technologies where they fit the system, including AI, computer vision, IoT, AR/VR, and blockchain. 

Net Devs works on enterprise software with a senior-led model, where experienced engineers guide the architecture and delivery while AI agents support drafting, testing, and other development tasks. For app modernization services, this setup fits companies that need to improve older systems but still want careful human control over technical choices, risk, and final quality. Net Devs is stack-agnostic.

Modernization with Net Devs can involve rebuilding parts of enterprise systems, improving front-end layers, adding cloud infrastructure, or using AI inside delivery workflows. They also cover infrastructure-as-code, platform engineering, automated and manual QA, and production deployment.

N-iX provides application modernization services for companies that need to update complex systems, move away from monolithic architecture, or improve how applications are developed and maintained. Their work covers modernization consulting, application re-engineering, re-architecting, monolith to microservices migration, cloud migration, infrastructure cost optimization, and technical debt management.

N-iX support process redesign, team augmentation, UI/UX reimagining, API lifecycle management, remediation, and cloud-enabled modernization. They work with major cloud providers, including AWS, Google Cloud, and Microsoft Azure. N-iX also has experience across finance, manufacturing, logistics and supply chain, retail, telecom, automotive, healthcare, energy, and agritech.

Itexus focuses on fintech software development, so their app modernization services are shaped around regulated systems, high-load environments, complex integrations, and security-heavy workflows. They work with financial products where legacy technology, tightly coupled code, fragile integrations, or outdated architecture can slow down new feature delivery and make compliance updates harder than they should be.

Itexus uses integration layers, service wrappers, the Strangler Fig pattern, anti-corruption layers, automated regression testing, contract testing, rollback paths, and parallel runs. That is a fairly practical setup for financial systems that cannot afford messy transitions. Their modernization work can also include project audits, code refactoring, technology upgrades, cloud and DevOps engineering, QA automation, cybersecurity and compliance readiness.

DXC Technology works with application modernization at enterprise scale, especially for companies dealing with large application portfolios, mainframes, middleware, databases, and cloud migration. DXC Technology supports rehosting, rearchitecting, replacement with SaaS, and cloud-native modernization, so the service can cover both older systems and the broader IT estate around them.

DXC Technology handles legacy application and mainframe modernization, application transformation, platform modernization, database modernization, and cloud migration across partners such as AWS, Google Cloud, and Microsoft. 

Mobian is a mobile app development studio with a strong fit for modernization projects where older mobile products need better usability, cleaner performance, or a more reliable technical base. Mobian works across Android and iOS, with Java, Kotlin, Objective-C, and Swift included in its mobile development stack. They also cover advanced back-end development, UX/UI design, product analytics, customer support, and consultation.

Mobile modernization is often less about making an app look newer and more about fixing the parts users feel every day. Mobian can support that through interface redesign, backend improvements, analytics setup, crash tracking, and regular progress updates during development.

ScienceSoft provides application modernization services for web, mobile, desktop, enterprise, SaaS, IoT, big data, blockchain, and AI/ML applications. Their modernization scope includes strategy and assessment, application conversion, database migration, reengineering, rearchitecting, cloud migration, containerization, mobile and cross-platform compatibility, security improvement, compliance, and accessibility remediation.

They combine automated modernization tools with manual engineering when the logic is too specific to convert cleanly. ScienceSoft works with Ispirer Systems for automated database migration and application conversion, while its engineers handle custom features, complex logic, and tuning. Their modernization services also cover regulated environments, with attention to HIPAA, PCI DSS, GDPR, accessibility standards, cloud security, DevOps, CI/CD, and data modernization.

Lengreo is mainly positioned around website development, digital marketing, and lead generation, so its app modernization services fit best when an older web product needs a cleaner user journey, stronger conversion flow, or a more stable technical setup. Lengreo builds business websites, eCommerce websites, landing pages, and portfolio sites, using JavaScript and WordPress as its main development tools.

Lengreo follows a process that starts with discovery, business analysis, and research before moving into prototyping, design, development, QA, and post-launch support. Their team can help companies refresh an outdated website, move it to a more manageable setup, or rebuild parts of it so the site better supports lead management.

Intellias approaches application modernization as a mix of technical cleanup, product thinking, and cloud planning. Their services cover application landscape rationalization, technical debt assessment, cloud readiness, TCO assessment, product strategy, experience design, and solution discovery. Intellias can help companies decide which systems should stay, which should be migrated, and which parts need refactoring, replatforming, relocation, rehosting, or replacement.

The company also works with older platforms such as IBM i, IBM Z, Universe, and VMware, while supporting modernization through AWS, Azure, Google Cloud, Databricks, Snowflake, Datadog, Confluent, Couchbase, Mendix, Atlassian, Contentful, Microsoft, BigCommerce, Commercetools, and UiPath. Intellias uses an incremental model, so modernization does not have to become one giant change that blocks normal operations. 

21Century.Tech is an AI-native software studio that builds production software with senior engineers and AI-assisted development workflows. For app modernization services, their strongest fit is legacy refactoring, feature rebuilding, documentation cleanup, testing, and delivery acceleration.

They work with a compact delivery style built around a clear brief, AI-augmented development, human review, CI/CD, tests, documentation, and deployment. 21Century.Tech can be useful for teams that need to modernize parts of an application quickly without handing final decisions to automation.

Vention provides legacy application modernization services for businesses that need to update old systems without losing the value already built into them. Their work covers code refactoring, modernization consulting, cloud migration, rearchitecting, reengineering, rebuilding, replacement, and integration services. Vention also works with monolith-to-microservices transitions.

Vention also brings DevOps, containerization, automation, agile delivery, and API work into modernization, so the service can cover both the application code and the delivery setup around it. Their industry coverage includes fintech, healthtech, real estate, adtech, EdTech, eCommerce, and game development.

SoftPro is a software development agency working with custom software, web applications, cloud development, and AI-related solutions. Their app modernization services fit companies that need to update business systems built on older processes, especially when the work involves Microsoft technologies.

SoftPro can support cloud migration, web application rebuilding, backend updates, CMS improvements, and software architecture changes. Their team also has experience with business portals, CRM/HRM systems, support systems, SaaS ETL platforms, and other internal software products. SoftPro’s technical leadership includes experience with .NET/C#, SQL, PowerBuilder, software architecture, databases, and project management.