whichdb
vs

Couchbase Server vs MongoDB

Couchbase Server: Memory-first distributed JSON database with SQL++, search, vector indexes and mobile sync. MongoDB: The default document database: flexible BSON documents, rich queries and built-in sharding.

key differences

  • Only Couchbase Server has triggers, offline sync.
  • Only MongoDB has materialized views.

choose couchbase for

  • +User profiles and session stores at high concurrency
  • +Travel, retail and gaming backends with strict latency SLAs
  • +Offline-first mobile and edge apps with Couchbase Lite
  • +Caching layer that also persists and can be queried

best at · OLTP, Cache, Sessions

choose mongodb for

  • +Product catalogs with highly variable attributes
  • +Content management and user-generated content
  • +Mobile and web backends that evolve their schema weekly
  • +IoT and event data with time-series collections

best at · OLTP, Content, Metadata

Couchbase ServerMemory-first distributed JSON database with SQL++, search, vector indexes and mobile sync.
MongoDBThe default document database: flexible BSON documents, rich queries and built-in sharding.
overview
Primary model
Document
Document
Also supports
Key-Value, Search Engine, Vector, Spatial
Search Engine, Vector, Time-Series, Spatial
Type
Database engine
Database engine
Status
Active
Active
Developer
Couchbase, Inc.
MongoDB, Inc.
First release
2010
2009
Latest version
8.0.3 (Sep 2026)
9.0.4 (Oct 14, 2026)
License
Source-availableBusiness Source License 1.1 (source); commercial Enterprise Edition
Source-availableServer Side Public License v1 (Community); commercial (Enterprise)
Free tier
✓
✓
popularity
WhichDB Score
27.5
80.5
Rank
#101
#4
GitHub stars
–
28.7K
Stack Overflow questions
4.1K
175.2K
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Large (≤ 1 PB)
Horizontal scaling
Native
Native
Multi-region
Active active
Read replicas
ACID
Full
Full
Consistency
Strong, Eventual
Tunable, Causal
Schema
Flexible
Flexible
Architecture
Distributed, Multi primary, In memory
Primary replica, Distributed, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
✓
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
AWS, Google Cloud, Azure
AWS, Google Cloud, Azure
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
SQL++ (N1QL), Full Text Search query DSL
MongoDB Query API (MQL), Aggregation pipeline
Client languages
C, C#, Go, Java, Kotlin, JavaScript, PHP, Python
C, C++, C#, Go, Java, Kotlin, JavaScript, PHP
Best for
OLTP, Cache, Sessions, Search
OLTP, Content, Metadata, IoT
Add more to this comparisonNot sure either fits? Try smart match

Couchbase Server vs MongoDB: FAQ

What is the difference between Couchbase Server and MongoDB?

Couchbase Server: Memory-first distributed JSON database with SQL++, search, vector indexes and mobile sync. MongoDB: The default document database: flexible BSON documents, rich queries and built-in sharding. Only Couchbase Server has triggers, offline sync. Only MongoDB has materialized views.

When should I choose Couchbase Server over MongoDB?

Choose Couchbase Server for user profiles and session stores at high concurrency; travel, retail and gaming backends with strict latency SLAs; and offline-first mobile and edge apps with Couchbase Lite. Choose MongoDB for product catalogs with highly variable attributes; content management and user-generated content; and mobile and web backends that evolve their schema weekly.

Is Couchbase Server or MongoDB more popular?

MongoDB ranks #4 on the WhichDB Score (80.5/100) and Couchbase Server ranks #101 (27.5/100). Popularity is not fit: check the requirements that matter for your project.

Are Couchbase Server and MongoDB open source?

Not in the OSI sense. Couchbase Server is source-available: you can read the code, but the license restricts some uses, typically offering it as a competing managed service. License: Business Source License 1.1 (source); commercial Enterprise Edition. Not in the OSI sense. MongoDB is source-available: you can read the code, but the license restricts some uses, typically offering it as a competing managed service. License: Server Side Public License v1 (Community); commercial (Enterprise).