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Azure Cosmos DB vs RavenDB

Azure Cosmos DB: Microsoft's globally distributed, multi-API NoSQL and vector database with SLA-backed latency. RavenDB: ACID document database for .NET and beyond, with auto-indexing, Corax search and multi-master replication.

key differences

  • Licensing: Azure Cosmos DB is proprietary (Proprietary Azure service); RavenDB is open source (copyleft) (AGPL-3.0 or commercial licence).
  • Azure Cosmos DB is built for larger datasets (Multi-PB) than RavenDB (≤ 10 TB).
  • Transactions: Azure Cosmos DB offers limited ACID; RavenDB offers full.
  • Only Azure Cosmos DB has triggers, stored procedures, columnar storage.
  • Only RavenDB has materialized views, pub/sub, compression, time travel.
  • Azure Cosmos DB has a serverless option; RavenDB does not.
  • RavenDB can run embedded in your application process.

choose azure-cosmos-db for

  • +Globally distributed user and session data
  • +IoT telemetry and device state
  • +Chat history and memory for AI agents
  • +Retail carts, catalogs and personalization

best at · OLTP, IoT, Sessions

choose ravendb for

  • +.NET business applications and line-of-business systems
  • +Embedded databases in desktop or edge applications
  • +Search-heavy catalogs and content
  • +Multi-site deployments needing offline-tolerant replication

best at · OLTP, Search, Vector search

Azure Cosmos DBMicrosoft's globally distributed, multi-API NoSQL and vector database with SLA-backed latency.
RavenDBACID document database for .NET and beyond, with auto-indexing, Corax search and multi-master replication.
overview
Primary model
Document
Document
Also supports
Key-Value, Graph, Wide-Column, Vector, Search Engine
Search Engine, Time-Series, Vector, Spatial
Type
Managed service
Database engine
Status
Active
Active
Developer
Microsoft
RavenDB Ltd. (Hibernating Rhinos)
First release
2017
2010
Latest version
–
7.2.7 (Oct 20, 2026)
License
ProprietaryProprietary Azure service
Open source (copyleft)AGPL-3.0 or commercial licence
Free tier
✓
✓
popularity
WhichDB Score
45.3
30.9
Rank
#39
#84
GitHub stars
–
4K
Stack Overflow questions
7.8K
2.5K
scale & guarantees
Comfortable data size
Massive (Multi-PB)
Medium (≤ 10 TB)
Horizontal scaling
Native
Native
Multi-region
Active active
Active active
ACID
Limited
Full
Consistency
Tunable, Strong, Causal, Eventual
Strong, Eventual
Schema
Schemaless
Schemaless
Architecture
Distributed, Multi primary, Serverless
Distributed, Multi primary, Embedded, Client server
deployment
Self-hosted
—
✓
Vendor-managed cloud
✓
✓
Serverless
✓
—
Embedded
—
✓
Edge
—
—
Clouds
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
Cosmos DB NoSQL (SQL dialect), MongoDB Query API, CQL, Gremlin
RQL (Raven Query Language), LINQ
Client languages
C#, Java, JavaScript, Python, Go, Rust
C#, Java, JavaScript, Python, Go, PHP, Ruby
Best for
OLTP, IoT, Sessions, Vector search
OLTP, Search, Vector search, Time-series
Add more to this comparisonNot sure either fits? Try smart match

Azure Cosmos DB vs RavenDB: FAQ

What is the difference between Azure Cosmos DB and RavenDB?

Azure Cosmos DB: Microsoft's globally distributed, multi-API NoSQL and vector database with SLA-backed latency. RavenDB: ACID document database for .NET and beyond, with auto-indexing, Corax search and multi-master replication. Licensing: Azure Cosmos DB is proprietary (Proprietary Azure service); RavenDB is open source (copyleft) (AGPL-3.0 or commercial licence). Azure Cosmos DB is built for larger datasets (Multi-PB) than RavenDB (≤ 10 TB). Transactions: Azure Cosmos DB offers limited ACID; RavenDB offers full.

When should I choose Azure Cosmos DB over RavenDB?

Choose Azure Cosmos DB for globally distributed user and session data; IoT telemetry and device state; and chat history and memory for AI agents. Choose RavenDB for .NET business applications and line-of-business systems; embedded databases in desktop or edge applications; and search-heavy catalogs and content.

Is Azure Cosmos DB or RavenDB more popular?

Azure Cosmos DB ranks #39 on the WhichDB Score (45.3/100) and RavenDB ranks #84 (30.9/100). Popularity is not fit: check the requirements that matter for your project.

Are Azure Cosmos DB and RavenDB open source?

No. Azure Cosmos DB is proprietary, closed-source software. Yes. RavenDB is open source. License: AGPL-3.0 or commercial licence.