# Apache Cassandra vs Azure Cosmos DB

| Attribute | Apache Cassandra | Azure Cosmos DB |
|---|---|---|
| **Vioscale score** | 44.8 (40% (low)) | 48.6 (31% (low)) |
| activity.commits_last_30d | 100 | - |
| adoption.dependent_repos | 0 | - |
| adoption.github_stars | 10,081 | - |
| deployment.options | `{"cloud":true,"hybrid":true,"on_prem":true,"self_hosted":true}` | `{"cloud":true}` |
| description.long | An open-source, distributed NoSQL database that automatically scales across commodity hardware and cloud infrastructure, providing high availability and fault tolerance with no single points of failure and multi-datacenter replication support. | Azure Cosmos DB is a NoSQL database service on Azure that prioritizes minimal latency and the ability to handle massive scale. It includes built-in vector search capabilities for AI-driven applications and is managed fully by Microsoft with no infrastructure to operate. |
| features.capabilities | `{"schema":"enforced","hosting":"both","data_model":"wide_column","consistency":"tunable","replication":"leaderless","multi_region":true,"partitioning":"automatic","transactions":"single_item","license_class":"permissive","query_language":"cql","secondary_indexes":"yes"}` | `{"schema":"schemaless","hosting":"cloud","data_model":"multi_model","multi_region":true,"license_class":"proprietary","vector_search":true}` |
| integrations.count | 19 | - |
| integrations.list | `[{"name":"Amazon Keyspaces"},{"name":"Azure Cosmos DB"},{"name":"Azure Managed Instance for Apache Cassandra"},{"name":"DataStax Astra"},{"name":"Elassandra"},{"name":"Instaclustr"},{"name":"Docker"},{"name":"DataStax Studio"},{"name":"AxonOps"},{"name":"Cassandra Lucene Index"},{"name":"Elasticsearch"},{"name":"Prometheus"},{"name":"DbVisualizer"},{"name":"Apache Ignite"},{"name":"Ansible"},{"name":"Lagom"},{"name":"EmoDB"},{"name":"FiloDB"},{"name":"CQLAI"}]` | - |
| language.primary | Java | - |
| license.spdx | Apache-2.0 | - |
| market.availability | - | `{"hqCountry":"US","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"mac":true,"linux":true,"windows":true}` | `{"web":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://cassandra.apache.org","retrievedAt":"2026-08-14T11:07:28.314Z"}` | `{"type":"usage","currency":"USD","freeTier":true,"sourceUrl":"https://azure.microsoft.com/acom/etc.clientlibs/onecloud/components/content/reimagine/atomic/carousel/v1/carousel/clientlibs/pricing-styles.ACSHASHbcdafd3e07059ae596973551430292fc.min.css","retrievedAt":"2026-08-14T11:05:21.839Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | freemium |
| pricing.price_level | free | low |
| reliability.status_page | - | yes |
| security.gdpr | - | yes |
| security.scorecard | 4.8 | - |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fapache%2Fcassandra&per_page=100","last_12m":0,"max_severity":null}` | - |

## Capabilities (NoSQL Databases)

| Capability | Apache Cassandra | Azure Cosmos DB |
|---|:--:|:--:|
| **Core** |  |  |
| Data model | Wide-column | Multi-model |
| **Query** |  |  |
| Query language | CQL | - |
| **Consistency** |  |  |
| Consistency | Tunable | - |
| **Transactions** |  |  |
| Transactions | Single-item | - |
| **Indexing** |  |  |
| Secondary indexes | Yes | - |
| **Scale** |  |  |
| Partitioning / sharding | Automatic | - |
| Multi-region | ✓ | ✓ |
| **Replication** |  |  |
| Replication topology | Leaderless | - |
| **Deployment** |  |  |
| Hosting | Cloud + self-hosted | Cloud only |
| **Schema** |  |  |
| Schema | Enforced | Schemaless |
| **Features** |  |  |
| TTL / auto-expiry | - | - |
| Change streams / CDC | - | - |
| Vector / search built-in | - | ✓ |
| **Licensing** |  |  |
| Licence class | Permissive OSS | Proprietary |

*Source: Vioscale. Generated 2026-09-01T16:33:22.016Z. "-" = undocumented, not absent.*