AWS Database Migration Service vs Estuary Flow: Which is Better in 2026?

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Change Data Capture (CDC)

AWS Database Migration Service and Estuary Flow are both Change Data Capture (CDC) tools, made for different people. AWS Database Migration Service is for teams moving databases into AWS, or keeping a source and target in sync during a migration, inside their own AWS account. Estuary Flow is for teams that need database changes in their warehouse or stream within seconds and want a managed service priced by data volume.

Quick verdict

There’s no single winner; pick on your constraint. Choose AWS Database Migration Service if your target, your source or both already live on AWS. Choose Estuary Flow if you want real-time CDC without running Kafka or Debezium yourself.

AWS Database Migration Service vs Estuary Flow: Side by Side

	AWS Database Migration Service	Estuary Flow
Category	Change Data Capture (CDC)	Change Data Capture (CDC)
What it is	Managed database migration and replication (AWS)	Managed real-time CDC and ELT
Source databases	Major commercial and open-source databases	Databases plus SaaS sources (200+ connectors)
Where it runs	Your AWS account	Estuary’s cloud or private deployment
How you pay	Hourly per instance or per DCU	$0.50 per GB plus a monthly fee per connector
Free access	AWS Free Tier credits for new accounts	Free up to 10 GB and 2 connectors a month
Pricing	Usage-based	Free · then usage-based
Starting price	Pay-as-you-go	Free tier available
Free tier	—
Rating	4.1	4.3
Best for	Change Data Capture (CDC): database migration, AWS, cut-over sync	Change Data Capture (CDC): managed CDC, per-GB pricing, real-time

Ratings are App Stack Builder’s editorial score out of 5, not an average of user reviews.

Pros & Cons

AWS Database Migration Service

Pay-as-you-go with no licence
Heterogeneous migrations plus free schema conversion
Serverless option scales itself
Lives inside your AWS account

Tied to AWS as source or target
Tuning large ongoing replications takes work
Hourly rates live in a calculator, not on the page

Estuary Flow

Real-time CDC rather than batch
Pricing you can predict from data volume
Backfill and streaming in one pipeline
Cheaper than MAR billing on busy tables

Smaller connector catalogue
Per-connector fee hurts wide, thin pipelines
Younger product with a smaller community

Key Features Compared

AWS Database Migration Service

Homogeneous and heterogeneous migrations from Oracle, SQL Server, PostgreSQL, MySQL, MongoDB, MariaDB and others
Billed hourly per replication instance (Single-AZ or Multi-AZ), or by DCU-hour on DMS Serverless
Burstable instances include 50 GB of storage; compute and memory-optimized ones include 100 GB
Schema Conversion is free apart from the S3 storage it uses
New accounts since July 15 2025 get up to $200 in AWS Free Tier credits instead of free DMS hours

Estuary Flow

Developer: free for up to 10 GB a month and 2 connector instances, no card and no time limit
Cloud: $0.50 per GB plus $100 a month per connector instance, $50 each after the sixth
Data counts once on capture and again on delivery, so 100 GB moved can bill as 200 GB
Connector fees prorated by the hour; no minimum on pay-as-you-go
Cloud starts with a 30-day free trial once you pass the Developer limits
Enterprise: annual contract with committed usage and discounts

Choose AWS Database Migration Service if…

Your target, your source or both already live on AWS.
You are converting between engines, for example Oracle to PostgreSQL.
You want pay-by-the-hour with nothing to install.

AWS Database Migration Service review & pricing

Choose Estuary Flow if…

You want to start free. Estuary Flow has a free tier and AWS Database Migration Service does not.
You want real-time CDC without running Kafka or Debezium yourself.
You prefer a bill based on GB moved over one based on rows changed.
You need a backfill and a live stream in the same pipeline.

Estuary Flow review & pricing

Frequently Asked Questions

Is AWS Database Migration Service better than Estuary Flow?⌄

What is the difference between AWS Database Migration Service and Estuary Flow?⌄

What it is. AWS Database Migration Service: Managed database migration and replication (AWS). Estuary Flow: Managed real-time CDC and ELT. Source databases. AWS Database Migration Service: Major commercial and open-source databases. Estuary Flow: Databases plus SaaS sources (200+ connectors). Where it runs. AWS Database Migration Service: Your AWS account. Estuary Flow: Estuary’s cloud or private deployment. How you pay. AWS Database Migration Service: Hourly per instance or per DCU. Estuary Flow: $0.50 per GB plus a monthly fee per connector. Free access. AWS Database Migration Service: AWS Free Tier credits for new accounts. Estuary Flow: Free up to 10 GB and 2 connectors a month.

AWS Database Migration Service vs Estuary Flow: which is cheaper?⌄

AWS Database Migration Service pricing: Usage-based. Estuary Flow pricing: Free · then usage-based. Confirm current pricing on each tool's official site, as plans change.

Which is rated higher, AWS Database Migration Service or Estuary Flow?⌄

On our editorial score, AWS Database Migration Service is 4.1 out of 5 and Estuary Flow is 4.3 out of 5, so Estuary Flow is slightly ahead. This is our own score, not an average of user reviews.

When should I skip both AWS Database Migration Service and Estuary Flow?⌄

Skip AWS Database Migration Service if you need long-running CDC into a warehouse outside AWS. Estuary Flow or Debezium fit that better. Skip Estuary Flow if you have many small sources. The per-connector fee adds up; Debezium is free to self-host.

Sources · tool facts checked November 2026