Moving Off a Managed PaaS to AWS: What to Check First, and the 8 Tools That Make the Move Painless

Migrating from managed platforms such as Heroku, Render, Vercel, or Fly.io to AWS is most justified when organizations have already encountered pricing or scaling limits, compliance or networking constraints, demanding stateful workloads, meaningful savings from AWS commitment discounts, and a clearly assigned platform owner; otherwise, remaining on a PaaS may be less costly and operationally simpler. A realistic total-cost comparison must include not only AWS infrastructure but also the deployment, routing, security, observability, secrets, rollback, preview-environment, support, and engineering capabilities previously bundled by the PaaS, along with frequently overlooked expenses such as NAT gateways, egress, logging, and idle environments. The recommended migration process includes inventorying dependencies, defining infrastructure through Terraform, carefully selecting and rehearsing a data migration strategy, running both platforms in parallel, and performing a DNS cutover with defined rollback conditions. Tools such as Infracost and AWS Pricing Calculator can estimate costs before deployment, AWS Application Migration Service and AWS DMS can support server and database migration, Cost Explorer and the Cost and Usage Report can track spending, and Kubecost or OpenCost can allocate shared Kubernetes costs by application or team. To preserve developer velocity after moving, organizations can build or adopt an internal developer platform that restores git-based deployments, preview environments, self-service operations, and rollbacks while keeping cloud resources, billing, tags, and discount benefits in their own AWS account.

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