Apache CouchDB
NoSQL database with multi-primary sync and HTTP API
Key differentiator
A NoSQL database featuring seamless multi-primary sync, scaling from Big Data to Mobile with an HTTP/JSON API
6,866 stars1,074 forksErlang
Alternative To
Best Alternatives to Azure Cosmos DB
Microsoft's globally distributed, multi-model NoSQL database service, offering low-latency access, elastic scalability, and multi-master replication for modern cloud-native applications.
Why people leave Azure Cosmos DB
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6 alternatives to Azure Cosmos DB
Free
OrientDB
Multi-model NoSQL database: graphs, docs, and key-value
Key differentiator
It is a multimodel NoSQL database combining graph and document database capabilities for scalable, high-performance applications
4,950 stars872 forksJava
TiKV
Distributed key-value store with ACID transactions at scale
Key differentiator
It is a highly scalable, low-latency, distributed key-value database designed for building robust data storage solutions
16,648 stars2,270 forksRust
MongoDB
Popular open source NoSQL document database for modern apps
Key differentiator
A popular, open-source NoSQL document database designed for high scalability, flexibility, and developer productivity
28,269 stars5,770 forksC++
JanusGraph
Distributed open source graph database for massive scale
Key differentiator
It is a distributed, open-source graph database designed for scalability and handling large graphs across multi-machine clusters
5,770 stars1,208 forksJava
ArangoDB
Multi-model database: documents, graphs, and key-value in one
Key differentiator
An open-source, distributed multi-model database combining document, graph, key-value, and search capabilities with a unified query language (AQL)
14,152 stars878 forksC++