Azure Cosmos DB

Microsoft's globally distributed NoSQL and vector database, with serverless and provisioned modes.

Free plan + paidBackend and database platforms

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Verified facts: 4 of 4
Alternatives ranked: 4
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About Azure Cosmos DB

Azure Cosmos DB is Microsoft's managed, globally distributed database service. Its native API is a NoSQL document store, and it also offers APIs compatible with MongoDB, Apache Cassandra, Gremlin graphs and Table storage, so existing apps can move over with fewer changes. Data can be replicated to any Azure region with configurable consistency levels, and it has built-in vector search for AI applications. You pay by request units, either provisioned (with autoscale) or serverless for spiky, low-traffic workloads, plus storage, and there is a free tier allowance for one account. It is a natural choice for teams building on Azure or with Microsoft tooling, and it integrates with Azure Functions, Microsoft Fabric and other services. The request unit model is notoriously hard to estimate, and costs can climb with global replication. It runs only on Azure and does not provide auth or file storage for end users.

Best for: Azure-based teams that need a globally replicated NoSQL or vector database.

What works

Global replication with tunable consistency
MongoDB and Cassandra-compatible APIs ease migrations
Serverless mode for spiky workloads

Why people leave

Request-unit pricing is hard to predict
Costs grow quickly with multi-region writes
Only available on Azure

Top Azure Cosmos DB alternatives

See all 4

1
Amazon DynamoDB
AWS's serverless NoSQL equivalent.
66.5
2
MongoDB Atlas
Managed MongoDB on Azure or other clouds, with the full MongoDB feature set.
62.6
3
Firebase
Managed NoSQL with client-side SDKs and auth included.
59.6
4
CockroachDB
Globally distributed SQL if you need relational data across regions.
57.2

Why people left Azure Cosmos DB

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Azure Cosmos DB: common questions

Is Azure Cosmos DB free?

Azure Cosmos DB has a free plan and paid plans. Free tier: First 1000 RU/s and 25 GB (checked on Azure Cosmos DB's own site).

Is Azure Cosmos DB open source?

No, Azure Cosmos DB is not open source.

What platforms does Azure Cosmos DB run on?

Azure Cosmos DB is available for Web.

What are the best alternatives to Azure Cosmos DB?

The highest-ranked Azure Cosmos DB alternatives right now are Amazon DynamoDB, MongoDB Atlas and Firebase. See the full ranked list for pricing, platforms and verified facts.

See all 4 Azure Cosmos DB alternatives

Azure Cosmos DB facts

4 of 4 verified

Database type: Serverless NoSQL and vector database; Checked Oct 25, 2026azure.microsoft.com(opens source in a new tab); “fully managed and serverless NoSQL vector database at any scale.”
Vector search: Built in; Checked Oct 25, 2026azure.microsoft.com(opens source in a new tab); “Watch the video Get built-in vector search”
Free tier: First 1000 RU/s and 25 GB; Checked Oct 25, 2026learn.microsoft.com(opens source in a new tab); “When free tier is enabled on an account, you get the first 1000 RU/s and 25 GB of storage in the account for free.”
APIs: NoSQL, MongoDB, Cassandra, Gremlin, Table; Checked Oct 25, 2026learn.microsoft.com(opens source in a new tab); “Azure Cosmos DB - Database for the AI Era Applies to: ✅ NoSQL, ✅ MongoDB, ✅ Apache Cassandra, ✅ Apache Gremlin, ✅ Table”