Best Application Modernization Software in the UK
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Compare the Top Application Modernization Software in the UK as of October 2026
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What is Application Modernization Software in the UK?
Application modernization software helps organizations update legacy applications to meet modern performance, scalability, and security requirements. It supports initiatives such as cloud migration, refactoring, re-platforming, and containerization. The software often includes assessment tools, automation, and dependency mapping to reduce risk during modernization efforts. Many platforms integrate with cloud providers, DevOps pipelines, and infrastructure tools to streamline deployment and management. By modernizing applications, businesses can improve agility, reduce technical debt, and extend the value of existing systems. Compare and read user reviews of the best Application Modernization software in the UK currently available using the table below. This list is updated regularly.
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1
Kissflow
Kissflow
Kissflow is an easy-to-use, low-code platform for custom application development tailored to business operations. Kissflow empowers process owners and IT developers to automate and build processes and applications for internal business operations. We help solve two main challenges in the enterprise: The first is the custom application backlog. Enterprise IT teams say “not now” to most custom application requests from business teams. While important to a department, they aren’t vital enough to engage limited IT bandwidth. Kissflow gives internal developers a hyper-fast platform to build various applications quickly. The second is starting a citizen development program. Process owners are scattered throughout the organization and need a standard, approved, and governed way to build automated applications that are a step up from spreadsheets. With its simple no-code design, patented rules engine, and comprehensive governance module,Starting Price: $1500 per month -
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Microsoft Power Apps
Microsoft
Now everyone can quickly build and share low-code apps with Microsoft Power Apps. Increase agility across your organization by rapidly building low-code apps that modernize processes and solve tough challenges. Empower your team to start building and launching apps right away using pre-built templates, drag-and-drop simplicity, and quick deployment—then roll out continuous improvements as needed. Give everyone the power to build the apps they need with advanced functionality previously only available to professional developers—including pre-built AI components. Provide professional developers the tools to seamlessly extend app capabilities with Azure Functions and custom connectors to proprietary or on-premises systems. Connect your apps to hundreds of data sources using a library of more than 260 connectors and Common Data Service —bringing your data together for a single source of truth while you modernize processes as well as customize and extend Office 365, Dynamics 365 etc.Starting Price: $20 per user per app per month -
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K2View
K2View
At K2View, we believe that every enterprise should be able to leverage its data to become as disruptive and agile as the best companies in its industry. We make this possible through our patented Data Product Platform, which creates and manages a complete and compliant dataset for every business entity – on demand, and in real time. The dataset is always in sync with its underlying sources, adapts to changes in the source structures, and is instantly accessible to any authorized data consumer. Data Product Platform fuels many operational use cases, including customer 360, data masking and tokenization, test data management, data migration, legacy application modernization, data pipelining and more – to deliver business outcomes in less than half the time, and at half the cost, of any other alternative. The platform inherently supports modern data architectures – data mesh, data fabric, and data hub – and deploys in cloud, on-premise, or hybrid environments. -
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Swimm
Swimm
Never let onboarding, knowledge silos, or context switching slow you down. Use Swimm to create and edit docs that are coupled with your code, auto-synced, and integrated into your workflow. Swimm's language agnostic editor, paired with its Smart Tokens and Snippet Studio is the foundation for modern documentation. Build great media-rich docs coupled with the code. Swimm's Auto-sync algorithm, helps your documentation stay in sync through refactoring and reorganization. You don't have to worry about changing file names, function names, or your implementation. Swimm will be able to keep up with it. Swimm checks your docs as your code evolves, and notifies you if your changes affect your documentation. Access docs right next to the code they refer to. Stay in your IDE and your flow. When you click on a link, your IDE will open a new tab with the documentation perfectly rendered from Markdown.Starting Price: $29 per month -
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AWS App Mesh
Amazon Web Services
AWS App Mesh is a service mesh that provides application-level networking to facilitate communication between your services across various types of computing infrastructure. App Mesh offers comprehensive visibility and high availability for your applications. Modern applications are generally made up of multiple services. Each service can be developed using various types of compute infrastructure, such as Amazon EC2, Amazon ECS, Amazon EKS, and AWS Fargate. As the number of services within an application grows, it becomes difficult to pinpoint the exact location of errors, redirect traffic after errors, and safely implement code changes. Previously, this required creating monitoring and control logic directly in your code and redeploying your services every time there were changes.Starting Price: Free -
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Azure SQL Managed Instance
Microsoft
Part of the Azure SQL family, SQL Managed Instance is an intelligent cloud database service combining the broadest SQL Server engine compatibility (back to SQL Server 2008) with the benefits of a fully managed, up-to-date platform as a service. With your successful assessment on Azure Migrate or Azure Data Studio, confidently modernize your custom and vendor-provided apps to Azure. Stop worrying about updates, upgrades, or end of support. SQL Managed Instance is built on the SQL Server engine, so it's always up to date with the latest SQL features and functionality. Meet your mission-critical requirements up to five times faster while paying up to 93 percent less than AWS RDS. Learn how SQL Managed Instance outperformed across three different benchmarks, spanning transactional and analytics workloads. Accelerate application modernization with the latest managed SQL Server capabilities in the cloud.Starting Price: $0.674 per hour -
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Rocket Uniface
Rocket Software
Rocket Uniface 10.4.03 is our most powerful release yet, enabling your teams to build, upgrade, and modernize mission-critical applications faster than ever—whether they’re expert developers or business power users. With improved low-code tools and automation, Uniface allows both technical and non-technical staff to quickly design, deploy, and enhance applications, all while future-proofing your core systems. Enjoy modern security, seamless integration, and a refreshed user experience without the disruption or risk of a massive rewrite. Uniface 10.4.03 empowers your organization to deliver business value at the speed your users demand—let’s get your legacy systems ready for tomorrow, today.Starting Price: Free -
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IBM Bob
IBM Bob
IBM Bob is an AI SDLC partner and an agentic integrated development environment designed to transform how developers work with real codebases. It is not just another autocomplete tool; it helps teams move from “help me code” to “help me modernize, secure, and scale.” Bob augments existing workflows across the software development lifecycle, helping users write, test, upgrade, refactor, debug, document, and secure software with confidence. Developers can turn natural language into working code, use single-line and multi-line code completion, clean up and fix existing code automatically, ask questions about a codebase, automate repetitive workflows, and scaffold new files or entire projects. Bob includes specialized modes that tailor its behavior for different tasks, including Code mode for writing and modifying code, Ask mode for explanations, Plan mode for designing before implementation, Advanced mode for complex tasks, and Orchestrator mode for coordinating multi-step projects.Starting Price: $20 per month -
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Mendix
Mendix
Mendix, a Siemens business and the global leader in enterprise low-code, is fundamentally reinventing the way applications are delivered in the digital enterprise. With the Mendix platform, enterprises can ‘Make with More,’ by broadening their development capability to conquer the software development bottleneck; ‘Make it Smart,’ by making apps with rich native experiences that are intelligent, proactive, and contextual; and ‘Make at Scale,’ to modernize core systems and build large app portfolios. The Mendix platform is built to promote intense collaboration between business and IT teams and dramatically accelerate application development cycles while maintaining the highest security, quality, and governance, in short, to help enterprises leap into their digital futures. The Mendix platform has been adopted by more than 4,000 leading companies around the world including Conoco Phillips, Business Development Bank of Canada, Post NL, Continental, Zurich Insurance, and -
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TCS MasterCraft TransformPlus
Tata Consultancy Services
TCS MasterCraft™ TransformPlus is a cognitive transformation platform that provides clear visibility into core business applications, with an intelligent blueprint, and centralized knowledge repository, which is technology agnostic and implicit knowledge driven. Its automated conversion platform for modernization and faster roll outs, helps enterprises in their digital journey without business disruption. Cognitive code analysis based application knowledge repository with business rule externalization. A platform for designing and executing data transformation and migration for enterprises, especially during legacy application modernization. A solution for development of new digital applications using automatic code generation platform, based on model-based development. An automated migration platform for DB and language conversion, which accelerates application transformation. -
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Rocket Visual COBOL
Rocket Software
Rocket Visual COBOL is development and runtime environment that helps enterprises maintain, enhance, and modernize distributed COBOL applications. Rocket COBOL products standardize COBOL development alongside other languages, giving teams access to industry standard tools, flexible deployment options, and DevOps workflows. With Rocket Visual COBOL, engineering teams work with COBOL inindustry-standard dev tools such as Visual Studio Code, Visual Studio, and Eclipse. It delivers advanced editing and debugging, continuous background compilation, and code analysis to speed development and onboarding. Its portable deployment platform enables risk-free moves to new infrastructure, supports cloud, container, and ARM environments, and integrates smoothly with APIs, .NET, and JVM. Rocket products also extend the value of large COBOL systems by making them easier to understand and evolve. GenAI powered insights help teams work confidently with COBOL and accelerate delivery. -
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Moderne
Moderne
Reduce 1000s of hours of static code analysis fixes to minutes. Patch security vulnerabilities across 100s of repositories at once. Moderne automates code remediation tasks for you, enabling developers to deliver more business value all the time. Automatically make safe, sweeping changes to your codebase that improve the quality, security, and cost of code. Manage dependencies of your software supply chain, keeping software up to date continuously. Alleviate code smells automatically without all the scanning noise of SAST and SCA tools. Work in high-quality code all the time. Find and fix CVEs automatically across repositories, it's the ultimate shift left for security. The reality of modern applications is that they naturally accrue technical debt. They are composed of large and diverse codebases and ecosystems, and a supply chain of custom, third-party, and open-source software. -
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Rocket MultiValue
Rocket Software
The Rocket MultiValue (MV) Application Platform is a comprehensive suite that combines an embedded database with a development environment, offering traditional database management alongside the flexibility and performance today's business applications demand. Designed to simplify deployment and reduce the need for specialized IT management, the platform’s integrated architecture promises a low overall cost of ownership and positions millions of global users at the forefront of solving critical business challenges. -
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Imogen
Mechanical Orchard
Mechanical Orchard’s Imogen platform rewrites mainframe applications with confidence by using real data flows, not just code translation, to safely rebuild aging systems into modern code. Legacy modernization is often slowed by stopgap patches, cloud emulation, technical debt, integration risk, and high-stakes cutover moments, but Imogen changes the risk equation with a behavior-first, test-driven approach. Instead of focusing only on code, Imogen captures how individual workloads actually behave through real data flows and creates a precisely equivalent behavioral replica of a complex system through a clear, iterative, and transparent process. It builds a precise behavioral specification from the running system, then applies a closed loop of rapid code generation and verification against those specifications, creating software that is audit-quality, idiomatic, and ready for what comes next. -
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IBM Cloud Pak® for Applications helps you modernize existing applications, embed additional security, and develop new apps that unleash digital initiatives. It offers cloud-native development solutions that can quickly deliver value, along with flexible licensing that can be tailored to your specific needs. On public clouds, on-premises or on a private cloud, run your applications where and how they work best for your business. We’ll provide the tools to sync them to Red Hat® OpenShift® on IBM Cloud®, a unified Kubernetes platform built on open-source standards. We'll also support them no matter where they run. Moving to the cloud doesn't mean that you'll build everything from the ground up. Instead, you can modernize traditional applications to increase their flexibility and scalability. Get an analysis of your apps with recommendations for what to modernize first and how to transform.
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IBM® Application Discovery and Delivery Intelligence (ADDI) is an analytical platform for application modernization. It uses cognitive technologies to analyze mainframe applications and quickly discover and understand the interdependencies of changes. Enhance mainframe applications rapidly to help drive revenue. Gain back your investment and start reaping returns quickly. Better understand application complexity to anticipate issues and cut app/development costs. Evolve systems and applications rapidly to take advantage of hybrid cloud. Accelerate your digital transformation with application insights that increase productivity and reduce risk. Use rapid analysis capabilities to discover the relationships between the components of your IBM z/OS® applications and understand the impact of potential change. Quickly find business rules, code snippets and APIs so that you can leverage them to support your business processes.
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AWS Transform
Amazon
AWS Transform is an agentic AI service from Amazon Web Services that automates and accelerates the modernization of legacy workloads, specifically .NET, mainframe, and VMware environments. Built on AWS’s migration and modernization experience, it deploys specialized AI agents to carry out tasks like assessment, code analysis, dependency mapping, refactoring, decomposition, validation, and planning, many of which run in parallel, to speed up large-scale transformations. Through a shared workspace and natural-language chat interface, cross-functional teams can collaborate, track progress, and manage modernization projects from end to end. AWS claims AWS Transform can make .NET apps port up to 4 times faster, greatly speed VMware configuration conversion, and compress mainframe migration timelines (years down to months), while also helping reduce legacy licensing, infrastructure cost, and ongoing maintenance expenses. -
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Assembler Code Refactoring
Rocket Software
Rocket Assembler Code Refactoring is a specialized modernization solution that automatically restructures legacy Assembler code into structured pseudocode or modern languages such as COBOL, C, or Java without altering external behavior, enabling faster, lower-risk modernization and improved maintainability. Assembler code is notoriously dense, poorly documented, and supported by a shrinking pool of specialists, making maintenance slow, costly, and error-prone; this product addresses those challenges by delivering semantics-preserving, auditable transformations that reduce outages and secure modernization without sacrificing stability. Its fully automated core engine uses mathematically guaranteed logic equivalence to eliminate conversion risk, dramatically accelerating projects while ensuring that refactored outputs are semantically identical to the original code. -
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Rocket Enterprise Suite
Rocket Software
Rocket® Enterprise Suite is an application modernization solution designed to reduce the risk of mainframe modernization by allowing organizations to migrate mainframe applications in their existing code. This minimizes failure risk and delivers faster project timelines. It supports both COBOL and PL/I workloads and can be deployed on-premises, in the cloud, or in hybrid environments, providing flexibility for diverse IT infrastructures. The suite includes tools for analyzing, securing, accessing, developing, testing, deploying, and migrating mainframe applications. It uses an AI-powered natural language assistant to simplify code analysis, making it easier for teams to understand and document complex mainframe applications and improve DevOps practices Backed by 40 years of experience and thousands of successful mainframe modernization projects, Rocket Enterprise Suite is built to deliver modern application development with lower project risk and increased development speed. -
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Rocket COBOL
Rocket Software
Rocket COBOL is development and runtime environment that helps enterprises maintain, enhance, and modernize distributed COBOL applications. Rocket COBOL products standardize COBOL development alongside other languages, giving teams access to industry standard tools, flexible deployment options, and DevOps workflows. With Rocket COBOL products, engineering teams work with COBOL in industry-standard tools such as Visual Studio Code, Visual Studio, and Eclipse. It delivers advanced editing and debugging, continuous background compilation, and code analysis to speed development and onboarding. Its portable deployment platform enables low risk moves to new infrastructure, supports cloud, container, and ARM environments, and integrates smoothly with APIs, .NET, and JVM ecosystems. Rocket products also extend the value of large COBOL systems by making them easier to understand and evolve. GenAI powered insights help teams work confidently with COBOL and accelerate delivery. -
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Rocket ChangeMan
Rocket Software
Rocket ChangeMan is a suite of mainframe change management tools designed to strengthen control, governance, and productivity across mission-critical systems and applications on IBM z/OS by managing software change from development through test and into production with accountability and quality assurance at every step. It centralizes and automates the lifecycle of code changes, assets, and configurations to reduce maintenance costs and regression errors through strict version control, traceable builds, packaging automation, and strategic release planning while preserving system integrity and simplifying audits. ChangeMan ZMF manages every software change and asset with support for developer choice in virtually any IDE, modern DevOps tools, or traditional environments like TSO/ISPF, and integrates seamlessly with Git to ensure accurate data mapping and trusted change tracking. -
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OpenFrame
TmaxSoft
OpenFrame from TmaxSoft is a comprehensive mainframe modernization and replatforming solution that enables organizations to migrate legacy mainframe applications and data to open systems such as Linux, Unix, Docker containers, or public cloud environments without modifying existing business logic, preserving core functionality while reducing total cost of ownership and avoiding risky rewrites. It delivers a future-oriented, standard three-tier architecture that improves performance, stability, flexibility, and scalability compared with traditional mainframes, with support for over 100K MIPS and increased processing capacity. OpenFrame uses advanced compiler technology and an integrated asset analysis environment (OF Manager) to automatically convert user interface logic, application logic, and data structures so applications run natively in open environments with minimal manual effort, enabling existing personnel and skill sets to be retained. -
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CodeTurn
Astadia
CodeTurn is Astadia’s automated mainframe code conversion product, built to automatically transform legacy source code into modern source code that is maintainable and 100% functionally equivalent to the original. It takes an application’s source code and converts it to functionally identical sources, ready to run in an alternative environment on the same platform or on a different platform altogether. Because the conversion and testing are fully automated, the outcome of the modernization project becomes highly predictable in terms of risks, costs, and duration. The migrated application is free of dependencies on proprietary Astadia software and relies on native industry-standard technologies instead. CodeTurn integrates all aspects of conversion to produce high-quality, functionally equivalent code and is typically used with Astadia tools such as DataTurn for legacy data migration, TestMatch for automated testing, and DataMatch for automated batch testing. -
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BMC AMI DevX
BMC Software
BMC AMI DevX reimagines mainframe development by helping teams build better code with less friction, stronger flow, and a more modern developer experience. It unifies agile development, testing, debugging, promotion, and delivery in a mainframe-inclusive toolchain designed to support developers at every skill level. Teams can work directly in preferred environments such as Eclipse and VS Code, reducing context switching and simplifying onboarding for new developers. BMC AMI DevX helps streamline editing, build, source code management, approvals, and deployment through Code Pipeline, enabling concurrent development, faster releases, and more secure delivery. Code Insights gives developers real-time visibility into complex mainframe applications, helping visualize logic, dependencies, and monolithic code structures, while generative AI explanations support faster understanding of unfamiliar COBOL, JCL, PL/I, and Assembler code. -
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Intellisys
EvolveWare
Intellisys is an AI-enhanced platform for application modernization and maintenance that uses intelligent automation to enable multiple pathways to modernization, helping organizations reduce dependency on legacy technology and the costs associated with it. It supports an unparalleled number of programming languages and incorporates custom AI/ML technologies that continue to be enhanced over time. Intellisys mitigates modernization risk through a phase-based approach: documentation and analysis, followed by agile business rules extraction and/or code optimization and migration. It executes diverse modernization objectives across the application portfolio, supporting technologies. It provides a 100% automated set of reverse-engineering artifacts, helping teams analyze implemented logic, understand the impact of potential changes, and keep documentation continuously updated. -
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AveriSource
AveriSource
AveriSource accelerates midrange and mainframe modernization through application intelligence, business rules extraction, and AI-powered transformation. It provides a comprehensive, proven modernization technology for organizations looking to accelerate and streamline their modernization journey, with the insight, accuracy, and flexibility to support complex legacy modernization projects. From early-stage assessments through end-to-end refactor, replatform, or reimagine transformation initiatives, it aligns with modernization goals and helps teams make informed strategic decisions. It supports the full modernization journey by helping organizations assess legacy application landscapes, rationalize which applications to modernize, and execute the right modernization strategy. AveriSource Inventory develops a comprehensive understanding of legacy applications by uncovering code insights, identifying unused files, and verifying environmental completeness. -
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COBOL Colleague
Phase Change Software
COBOL Colleague transforms legacy COBOL systems into navigable knowledge by using deterministic AI and knowledge graph technology to decode, document, and explain critical business logic with verified understanding, no hallucinations, and no guessing. It maps legacy code into clear Business Functions, giving teams a reliable way to understand what their systems actually do, where business rules live, and how changes may affect the application. Instead of spending months documenting systems manually, COBOL Colleague captures institutional knowledge automatically by slicing code to reveal complete business functions, including every derivation, condition, and dependency that influences each output field. Its proprietary analysis untangles complex COBOL structures such as REDEFINES, CALLS, PERFORMS, and GOTOs, isolating data transformation logic and producing natural language documentation that technical and business stakeholders can share. -
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LensHub
LensHub
LensHub.io is an AI-powered digital modernization platform designed to help enterprises, startups, and technology teams modernize legacy systems, accelerate software delivery, and build scalable digital products faster with reduced risk and cost. The platform combines intelligent modernization workflows, AI-assisted engineering, and structured transformation journeys to simplify complex software modernization initiatives. LensHub analyzes existing applications, identifies technical debt, maps dependencies, and provides guided modernization roadmaps for cloud migration, framework upgrades, architecture transformation, and AI adoption. Organizations can use LensHub to modernize legacy .NET, Java, frontend, and enterprise applications into scalable, cloud-ready, and future-proof systems without disrupting ongoing business operations. Its automation-driven approach helps engineering teams reduce manual effort, accelerate migration timelines, and improve delivery predictability.Starting Price: $18 USD per month -
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Carbon60
Carbon60
Starting or continuing on your cloud journey, whether public, private or hybrid, is a complex undertaking. But no matter your company size or industry, our cloud consulting experts can help with end-to-end solutions to plan, migrate and operate your business in the cloud. Planning your cloud transformation can be a complex undertaking. Whether you’re interested in big data, Kubernetes enablement, application modernization or security, Cloud Launchpad will get you there faster. Our enterprise-managed cloud services will give you 24/7 peace of mind, with full support to ensure your mission-critical data is safe, and your cloud services remain secure, compliant, agile, reliable and fast. Chart a new course for your IT environment with a Cloud Readiness Assessment. With a proven process, we take into consideration your technology, people and business strategy and tailor a public, private or hybrid cloud environment that will set your organization up for success. -
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3X Code Conversion
3X Data Engineering
3X Code Conversion is an AI-augmented data engineering accelerator that converts legacy SQL and ETL code into modern cloud platform code. The tool supports migrations from Teradata, Oracle, Netezza, SQL Server, MySQL, PostgreSQL, and Redshift to Snowflake, Databricks, BigQuery, Microsoft Fabric, Synapse, and other modern data platforms. It can ingest SQL scripts, stored procedures, ETL jobs, BTEQ macros, FastLoad jobs, SSIS pipelines, and undocumented legacy codebases. 3X Code Conversion uses deep code understanding, complexity scoring, agentic conversion, automated refactoring, testing, validation, and developer action items. The platform generates converted code, validation reports, standardized formatting, migration summaries, documentation, and AI-assisted code reviews. Built for enterprise cloud migrations, 3X Code Conversion helps data teams move legacy code to modern platforms in hours instead of months.
