AWS Mainframe Modernization review
A specialized AWS service for modernizing mainframe applications, code, and data.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
AWS Mainframe Modernization is a cloud service for migrating and modernizing mainframe applications and data on AWS. It is designed for enterprise workloads, including COBOL and PL/I applications, and supports migration teams, consultants, and AWS partners. Its scope spans assessment and migration planning, automated refactoring to modern Java-based applications, replatforming, managed runtimes, deployment, monitoring, testing, operations, and CI/CD support.
Pricing is usage-based, with no free plan. AWS Transform for mainframe Runtime costs $0.31 per AWS CPU core per hour for modernized application runtimes. Rocket Runtime costs $5.55 per AWS CPU core per hour, while Rocket Developer costs $2.14 per AWS CPU core per hour. Data Replication with Precisely costs $60 per GB for IBM z/OS and $30 per GB for IBM i. File Transfer with BMC costs $1.30 per GB, and Code Conversion with mLogica costs $2.75 per line of code. Pricing also varies by component, infrastructure, and region, so teams should map each required capability before estimating total spend.
The strongest fit is an organization moving substantial mainframe workloads into an AWS operating model. The service connects with Amazon S3, Amazon RDS, Amazon FSx, Amazon EFS, AWS Database Migration Service, AWS Migration Hub, CloudFormation, PrivateLink, Key Management Service, Amazon Neptune, Amazon Bedrock, and other AWS services. Assessment, dependency mapping, continuous replication, database migration workflows, and deployment support give migration teams coverage across multiple stages. However, AWS states that the Self-Managed Experience and Managed Runtime Environment experience are no longer open to new customers, although existing customers can continue using them. Teams outside mainframe modernization, or those seeking a simpler single-purpose migration tool, should consider a broader or narrower alternative.
AWS Mainframe Modernization pros and cons
- Where it wins
- Covers assessment, refactoring, replatforming, and deployment
- Supports COBOL and PL/I modernization with dependency analysis
- Integrates with AWS services for data migration and operations
- Where it doesn't
- No free plan; pricing is usage-based across multiple components
- Some legacy experience options are closed to new customers
- Broad component pricing can be complex to estimate
AWS Mainframe Modernization fact sheet, pricing and score →
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