In 2025, AS400 systems (now known as IBM i) continue to be integral to many enterprises. However, to remain competitive, these legacy systems require modernization to integrate with cloud platforms, enhance user experiences, and support agile development practices. This guide delves into the top 20 AS400 modernization tools, highlighting their features and how they can transform your legacy applications.

Why Modernize Your AS400 Systems in 2025?

Modernizing AS400 systems is no longer optional. With the rise of cloud computing, AI-driven analytics, and user-centric applications, businesses must ensure their IBM i systems can adapt to these advancements. Modernization enables seamless integration with contemporary technologies, enhances security, and improves operational efficiency.

Top 20 AS400 Modernization Tools for 2025

1. Rocket Software

Rocket API: Facilitates RESTful API creation for AS400 applications, enabling integration with modern web services.

Rocket LegaSuite: Transforms green-screen applications into modern web interfaces using a low-code platform.

Rocket Aldon: Provides application lifecycle management tools to support DevOps practices.

2. Fresche Solutions

X-Analysis: Offers in-depth application analysis to understand and document existing codebases.

Newlook: Modernizes user interfaces without altering the underlying code.

Fresche View: Assists in transitioning from legacy programming languages to modern ones like Java and .NET.

3. LANSA

Visual LANSA: A low-code platform for developing web and mobile applications while leveraging existing AS400 logic.

RAMP: Integrates multiple AS400 applications into a single, modern user interface.

Also read: Top 10 areas for AS400 Modernization

4. Profound Logic

Profound UI: Converts green-screen applications into rich web interfaces using a drag-and-drop builder.

Profound API: Simplifies the creation of RESTful APIs for AS400 applications.

Profound.js: Combines Node.js with AS400, enabling the development of scalable applications using modern JavaScript.

5. IBM Rational Developer for i (RDi)

Code Analysis and Refactoring: Provides tools to analyze and improve existing codebases.

Integrated Debugging: Offers robust debugging capabilities for both legacy and modern languages.

Support for Modern Languages: Enables development in Java, SQL, and XML alongside traditional AS400 languages.

6. Remain Software

TD/OMS: An end-to-end solution for version control, deployment, and change management.

Gravity: A project management tool that integrates with TD/OMS to enhance collaboration.

7. ARCAD Software

ARCAD Transformer RPG: Automates the conversion of RPG code to modern free-form syntax.

ARCAD Verifier: Automates testing processes to ensure application reliability.

ARCAD Observer: Provides comprehensive application analysis and documentation.

8. Surround Technologies

Accelerator for .NET: Facilitates the development of .NET applications using existing AS400 logic.

Surround 360: Provides tools for integrating and modernizing AS400 applications with cloud and mobile technologies.

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9. Cozystream

Cozystream Designer: A low-code platform for transforming green-screen interfaces into modern web and mobile applications.

Cozystream API: Enables the creation of RESTful APIs for seamless integration with modern systems.

10. MobiCheck

MobiCheck Mobile Suite: Offers tools for creating mobile versions of AS400 applications.

MobiCheck API Gateway: Facilitates secure and scalable API integration for mobile applications.

11. HelpSystems

Robot: Automates operations like job scheduling and system monitoring.

Sequel Data Access: Provides advanced data access, analysis, and reporting capabilities.

12. Cognos

Cognos Analytics: Enables advanced data visualization, reporting, and predictive analytics.

Cognos Integration Server: Integrates AS400 data with modern BI platforms.

13. MobiAccess

MobiAccess SDK: Enables the development of mobile applications that interact with AS400 data.

MobiAccess Enterprise Server: Ensures secure and reliable communication between mobile devices and AS400 systems.

Also read: Our IBM iSeries Modernization Solution for an Arkansas based company

14. Zend Server

Zend PHP Toolkit: Provides tools and libraries for developing PHP applications on AS400.

Zend Server for IBM i: Enhances the performance, security, and scalability of PHP applications running on AS400.

15. WebSmart

WebSmart PHP: Enables the development of PHP-based web applications that interact with AS400 data.

WebSmart ILE: Provides tools for creating RPG-based web applications.

16. Infinite i (by Infinite Software)

Infinite i Application Modernization Suite: Converts legacy AS400 applications into cloud-native applications without altering business logic.

Infinite Cloud: Moves AS400 workloads to public or private cloud environments while maintaining full functionality.

17. mrc (michaels, ross & cole)

m-Power Development Platform: A low-code tool that creates responsive web and mobile apps using existing AS400 data and programs.

Built-in BI Features: Adds dashboards, reports, and predictive analytics directly to your IBM i environment.

18. Eradani

Eradani Connect: Bridges open-source technology and AS400 by exposing RPG programs as REST APIs for external apps to consume.

Node.js & Python Integration: Allows modern languages to be used in parallel with legacy IBM i applications.

19. iModernize

Green Screen GUI Transformer: Quickly converts text-based UIs into fully functional GUIs without rewriting core logic.

iModernize Cloud Sync: Syncs legacy data with modern cloud databases in real time.

20. TmaxSoft OpenFrame

Mainframe Replatforming: Helps companies migrate AS400 workloads to open systems while maintaining application behavior.

Full Code Conversion: Converts RPG and COBOL to Java, streamlining future development efforts.

Which path fits your IBM i transformation goals?

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Choosing the Right AS400 Modernization Tool

Every organization has unique business needs. Here’s how to narrow your choice:

  • Want faster UI upgrades? Go for Profound UI or Rocket LegaSuite.
  • Looking to develop new features without retiring old logic? Try LANSA or m-Power.
  • Planning to move to the cloud? Consider Infinite i or TmaxSoft OpenFrame.
  • Need API integrations to play well with new tech? Profound.js or Eradani Connect are your friends.
  • Focused on analytics and BI? Sequel from HelpSystems or Cognos is the way to go.

Conclusion – Your Next Step in AS400 Modernization

In 2025, AS400 modernization isn’t just about "keeping up." It’s about unlocking new business value, improving customer experience, and enabling faster innovation. The tools listed above represent the best-in-class options available today, covering everything from UI transformation to cloud readiness.

Whether you're at the planning stage or already modernizing, choosing the right AS400 modernization tools can define your success. Evaluate based on your tech stack, business goals, and team capabilities – and start building a more agile IBM i environment today.

Want Help Choosing the Right Tool?

At Nalashaa, we’ve helped dozens of enterprises navigate their IBM i modernization journey with confidence. From tool selection to implementation – we do it all.

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