Couchbase Server vs eXtremeDB

Couchbase Server9.4Visit eXtremeDB8.5Visit

Higher score Couchbase Server #1 in In-Memory Databases 9.4/10 Free plan Free plan✓ 1 of 4 features Visit Couchbase

vs

eXtremeDB #7 in In-Memory Databases 8.5/10 Pricing on request · 60-day trial Free trial✓ 4 of 4 features Visit McObject

• Couchbase Server fits best

  Teams wanting a broad, flexible in-memory platform

• eXtremeDB fits best

  Embedded and edge applications needing durability

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Side by side

Feature	Couchbase Server 9.4/10 Visit ↗	eXtremeDB 8.5/10 Visit ↗
At a glance
Editor score	9.4	8.5
Ranking	#1 in In-Memory Databases	#7 in In-Memory Databases
Best for	Teams wanting a broad, flexible in-memory platform	Embedded and edge applications needing durability
Pricing model	Free plan + paid	Paid
Starting price	—	Pricing on request · 60-day trial
Free plan	✓ (best)	Not checked yet
Free trial	—	60 days
Deployment	Cloud, Self-hosted	Cloud, Self-hosted
Support	Community, Docs	Email, Phone, Docs
Built for	Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features Couchbase Server 1/4 · eXtremeDB 4/4
Data persistence	Not checked yet	✓ (best)
High availability	Not checked yet	✓ (best)
SQL support	Not checked yet	✓ (best)
Vector search	✓	✓
Specs
Deployment	Not checked yet	Both
Included memory	Not checked yet	Not checked yet
Supported data models	Not checked yet	relational SQL, object-based/native, row-oriented, columnar time-series, in-memory, persistent, hybrid
Our review
Pros	Free Community Edition for development and production use Combines key-value, JSON, SQL++, transactions, search, and vector indexing Supports containers, Kubernetes, cloud infrastructure, and on-premises deployments	Supports in-memory, persistent, and hybrid storage modes Combines replication, failover, clustering, and distributed queries Offers SQL, native APIs, vector indexes, and time-series layouts
Cons	Community Edition clusters are limited to five nodes for Server 7.0 and later Community Edition includes community-supported distribution Enterprise pricing is based on production node count	Pricing requires contacting McObject's sales team The 60-day offer is an evaluation trial, not a perpetual free plan Its broad feature set may exceed the needs of simple embedded applications
Our verdict	Couchbase Server is a distributed, open-source document database for enterprise applications that need more than basic key-value access. It stores JSON and binary documents, supports SQL++ querying and ACID transactions, and includes… Read the review →	eXtremeDB is an embedded database management system for professional developers building resource-constrained, real-time, IoT, networking, financial, and high-performance computing applications. It supports embedded and client/server… Read the review →

Strengths and trade-offs

• Couchbase Server — where it wins

  • Free Community Edition for development and production use
  • Combines key-value, JSON, SQL++, transactions, search, and vector indexing
  • Supports containers, Kubernetes, cloud infrastructure, and on-premises deployments

  Where it doesn't

  • Community Edition clusters are limited to five nodes for Server 7.0 and later
  • Community Edition includes community-supported distribution
  • Enterprise pricing is based on production node count

• eXtremeDB — where it wins

  • Supports in-memory, persistent, and hybrid storage modes
  • Combines replication, failover, clustering, and distributed queries
  • Offers SQL, native APIs, vector indexes, and time-series layouts

  Where it doesn't

  • Pricing requires contacting McObject's sales team
  • The 60-day offer is an evaluation trial, not a perpetual free plan
  • Its broad feature set may exceed the needs of simple embedded applications

• Couchbase Server9.4/10 · Free plan

  A broad in-memory platform with free production use and extensive database capabilities.

  Visit CouchbaseFull verdict →
• eXtremeDB8.5/10 · Pricing on request · 60-day trial

  A broad embedded database for durable, real-time, and distributed workloads.

  Visit McObjectFull verdict →