Amazon DynamoDB vs Amazon MemoryDB

Amazon DynamoDB9.3Visit Amazon MemoryDB8.7Visit

Higher score Amazon DynamoDB #1 in Key-Value Databases 9.3/10 Free plan Free plan✓ 2 of 3 features Try Amazon DynamoDB

vs

Amazon MemoryDB #6 in Key-Value Databases 8.7/10 Paid ✓ 3 of 3 features Try Amazon MemoryDB

• Amazon DynamoDB fits best

  Managed, scalable AWS key-value workloads

• Amazon MemoryDB fits best

  Durable managed Redis or Valkey workloads

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Side by side

Feature	Amazon DynamoDB 9.3/10 Visit ↗	Amazon MemoryDB 8.7/10 Visit ↗
At a glance
Editor score	9.3	8.7
Ranking	#1 in Key-Value Databases	#6 in Key-Value Databases
Best for	Managed, scalable AWS key-value workloads	Durable managed Redis or Valkey workloads
Pricing model	Free plan + paid	Paid
Starting price	—	$0.20/GB usage-based
Free plan	✓ (best)	—
Free trial	—	—
Deployment	Cloud	Cloud
Platforms	Web, Windows, macOS, Linux, iOS, Android	Web
Support	Docs	Tickets, Community, Docs
Integrations	2 integrations	7 integrations
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features Amazon DynamoDB 2/3 · Amazon MemoryDB 3/3
TTL support	✓	✓
Clustering support	Not checked yet	✓ (best)
Multi-region support	✓	✓
Specs
Deployment model	Cloud	Cloud
Maximum value size	0.4 MB	Not checked yet
Persistence modes	Disk	Both
Supported protocols	HTTP(S), JSON, PartiQL	Valkey Cluster protocol; Redis OSS Cluster protocol; HTTPS
Our review
Pros	Supports key-value and document data models with automatic scaling Offers multi-Region global tables, transactions, recovery, and backups Connects with Lambda, S3, Kinesis Data Streams, Athena, and SageMaker	Multi-AZ transactional-log durability with automatic failover JSON documents, vector search, and active-active multi-Region replication TLS, AWS KMS encryption, ACLs, and IAM-based access controls
Cons	Usage-based billing may be less predictable than fixed paid plans Cloud deployment and AWS service integration may limit portability Items have a documented maximum size of 400 KB	No free plan; MemoryDB is paid-only On-demand charges vary by node type and usage Multi-Region deployments do not support TTL
Our verdict	Amazon DynamoDB is a serverless, fully managed NoSQL database for applications built around key-value or document data models. It is intended for operational workloads such as user profiles, shopping carts, session stores, gaming data, and… Read the review →	Amazon MemoryDB is a fully managed, durable in-memory key-value database for applications that need low-latency reads, fast writes, high throughput, and data durability. It is compatible with Valkey and Redis OSS data structures, commands,… Read the review →

Strengths and trade-offs

• Amazon DynamoDB — where it wins

  • Supports key-value and document data models with automatic scaling
  • Offers multi-Region global tables, transactions, recovery, and backups
  • Connects with Lambda, S3, Kinesis Data Streams, Athena, and SageMaker

  Where it doesn't

  • Usage-based billing may be less predictable than fixed paid plans
  • Cloud deployment and AWS service integration may limit portability
  • Items have a documented maximum size of 400 KB

• Amazon MemoryDB — where it wins

  • Multi-AZ transactional-log durability with automatic failover
  • JSON documents, vector search, and active-active multi-Region replication
  • TLS, AWS KMS encryption, ACLs, and IAM-based access controls

  Where it doesn't

  • No free plan; MemoryDB is paid-only
  • On-demand charges vary by node type and usage
  • Multi-Region deployments do not support TTL

• Amazon DynamoDB9.3/10 · Free plan

  A mature AWS database for scalable key-value and document workloads.

  Try Amazon DynamoDBFull verdict →
• Amazon MemoryDB8.7/10 · Paid

  A durable Redis- and Valkey-compatible service for low-latency, scalable workloads.

  Try Amazon MemoryDBFull verdict →