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Head-to-head · Key-Value Databases

FoundationDB vs Amazon MemoryDB

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score FoundationDB #4 in Key-Value Databases 8.9/10 Open source ✓ 2 of 3 features Visit FoundationDB
Amazon MemoryDB #6 in Key-Value Databases 8.7/10 Paid ✓ 3 of 3 features Try Amazon MemoryDB

FoundationDB leads on 0 checks, Amazon MemoryDB on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreFoundationDB · 8.9/10
  • Most featuresAmazon MemoryDB · 3 of 3

FoundationDB scores higher on our rubric for key-value databases: 8.9 against 8.7 out of 10; our editors rank them #4 and #6.

On deployment model, FoundationDB gives you Self_hosted where Amazon MemoryDB offers Cloud.

FoundationDB is the better fit for developers needing strict transactional key-value storage. Amazon MemoryDB is the better fit for durable managed Redis or Valkey workloads.

  • FoundationDB fits best

    Developers needing strict transactional key-value storage

  • Amazon MemoryDB fits best

    Durable managed Redis or Valkey workloads

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Side by side

Feature FoundationDB 8.9/10 Visit ↗ Amazon MemoryDB 8.7/10 Visit ↗
At a glance
Editor score 8.9 8.7
Ranking #4 in Key-Value Databases #6 in Key-Value Databases
Best for Developers needing strict transactional key-value storage Durable managed Redis or Valkey workloads
Pricing model Free Paid
Starting price Open source $0.20/GB usage-based
Free plan Not checked yet —
Free trial — —
Deployment Self-hosted, Cloud Cloud
Platforms Windows, macOS, Linux Web
Support Community, Docs Tickets, Community, Docs
Built for Mid-market, Enterprise Small business, Mid-market, Enterprise
Features FoundationDB 2/3 · Amazon MemoryDB 3/3
TTL support Not checked yet ✓ (best)
Clustering support ✓ ✓
Multi-region support ✓ ✓
Specs
Deployment model Self_hosted Cloud
Maximum value size Not checked yet Not checked yet
Persistence modes Both Both
Supported protocols C API, Go API, Python API, Ruby API, Java API, Node.js API Valkey Cluster protocol; Redis OSS Cluster protocol; HTTPS
Our review
Pros
  • Strict-serializable multi-key ACID transactions
  • Ordered range reads with lexicographic key selectors
  • Geographic replication, failover, and automatic repartitioning
  • 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
  • Self-hosted deployment requires cluster administration
  • Maximum documented value size is 100 kB
  • Core access centers on a lower-level key-value API
  • 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

FoundationDB is an open-source distributed database for applications that need an ordered binary key-value model and strongly consistent transactions. It suits developers building services that require multi-key ACID operations, strict…

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 →
  1. FoundationDBKey-Value Databases 8.9Open source
  2. Amazon MemoryDBKey-Value Databases 8.7Paid

Strengths and trade-offs

  • FoundationDB — where it wins

    • Strict-serializable multi-key ACID transactions
    • Ordered range reads with lexicographic key selectors
    • Geographic replication, failover, and automatic repartitioning

    Where it doesn't

    • Self-hosted deployment requires cluster administration
    • Maximum documented value size is 100 kB
    • Core access centers on a lower-level key-value API

  • 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

More comparisons

All Key-Value databases comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update