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Amazon ElastiCache vs Memcached

Amazon ElastiCache: AWS's managed Valkey, Redis OSS and Memcached service, provisioned or serverless. Memcached: The original multi-threaded, dead-simple distributed memory cache for key-value blobs.

key differences

  • Licensing: Amazon ElastiCache is proprietary (AWS service terms); Memcached is open source (permissive) (BSD 3-Clause).
  • Horizontal scaling is native in Amazon ElastiCache and manual in Memcached.
  • Transactions: Amazon ElastiCache offers limited ACID; Memcached offers none.
  • Only Amazon ElastiCache has transactions, secondary indexes, full-text search, vector search, geospatial.
  • Amazon ElastiCache has a serverless option; Memcached does not.

choose amazon-elasticache for

  • +Database query caching for RDS and DynamoDB
  • +Session storage for web apps on AWS
  • +Leaderboards and real-time counters
  • +Semantic caching for generative AI apps

best at · Cache, Sessions, Pub/Sub

choose memcached for

  • +Read-through caching of database query results
  • +Rendered page and fragment caching
  • +Session storage when losing sessions is acceptable
  • +Very large, horizontally sharded look-aside cache tiers

best at · Cache, Sessions

Amazon ElastiCacheAWS's managed Valkey, Redis OSS and Memcached service, provisioned or serverless.
MemcachedThe original multi-threaded, dead-simple distributed memory cache for key-value blobs.
overview
Primary model
Key-Value
Key-Value
Also supports
Vector, Search Engine
–
Type
Managed service
Database engine
Status
Active
Active
Developer
Amazon Web Services
Memcached community (originally Danga Interactive)
First release
2011
2003
Latest version
Valkey 9.1 engine (Jun 23, 2026)
1.6.45 (Jul 9, 2026)
License
ProprietaryAWS service terms
Open source (permissive)BSD 3-Clause
Free tier
✓
✓
popularity
WhichDB Score
29.1
50.6
Rank
#89
#25
GitHub stars
–
14.3K
Stack Overflow questions
916
5.2K
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Large (≤ 1 PB)
Horizontal scaling
Native
Manual
Multi-region
Read replicas
None
ACID
Limited
None
Consistency
Eventual
Eventual
Schema
Schemaless
Schemaless
Architecture
In memory, Primary replica, Distributed, Serverless
In memory, Single node, Client server
deployment
Self-hosted
—
✓
Vendor-managed cloud
✓
—
Serverless
✓
—
Embedded
—
—
Edge
—
—
Clouds
AWS
AWS, Google Cloud, Alibaba Cloud, Tencent Cloud
capabilities
Transactions
✓
—
Joins
—
—
Secondary indexes
✓
—
Full-text search
✓
—
Vector search
✓
—
Geospatial
✓
—
JSON
✓
—
Change data capture
—
—
Triggers
—
—
Stored procedures
✓
—
Materialized views
—
—
TTL / expiry
✓
✓
Pub/Sub
✓
—
Columnar storage
—
—
In-memory
✓
✓
Durable persistence
✓
—
Compression
—
—
Encryption at rest
✓
—
Role-based access
✓
—
Time travel
—
—
Branching
—
—
Online schema changes
—
—
Streaming ingest
✓
—
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
Redis commands (RESP), Memcached protocol, Lua
Memcached text/meta protocol
Client languages
Python, Java, JavaScript, Go, C#, Rust, Ruby, PHP
C, Java, Python, PHP, Go, JavaScript, Ruby, C#
Best for
Cache, Sessions, Pub/Sub, Queue
Cache, Sessions
Add more to this comparisonNot sure either fits? Try smart match

Amazon ElastiCache vs Memcached: FAQ

What is the difference between Amazon ElastiCache and Memcached?

Amazon ElastiCache: AWS's managed Valkey, Redis OSS and Memcached service, provisioned or serverless. Memcached: The original multi-threaded, dead-simple distributed memory cache for key-value blobs. Licensing: Amazon ElastiCache is proprietary (AWS service terms); Memcached is open source (permissive) (BSD 3-Clause). Horizontal scaling is native in Amazon ElastiCache and manual in Memcached. Transactions: Amazon ElastiCache offers limited ACID; Memcached offers none.

When should I choose Amazon ElastiCache over Memcached?

Choose Amazon ElastiCache for database query caching for RDS and DynamoDB; session storage for web apps on AWS; and leaderboards and real-time counters. Choose Memcached for read-through caching of database query results; rendered page and fragment caching; and session storage when losing sessions is acceptable.

Is Amazon ElastiCache or Memcached more popular?

Memcached ranks #25 on the WhichDB Score (50.6/100) and Amazon ElastiCache ranks #89 (29.1/100). Popularity is not fit: check the requirements that matter for your project.

Are Amazon ElastiCache and Memcached open source?

No. Amazon ElastiCache is proprietary, closed-source software. License: AWS service terms. Yes. Memcached is open source. License: BSD 3-Clause.