The best open source alternative to Amazon Neptune is Neon Postgres. If that doesn't suit you, we've compiled a ranked list of other open source Amazon Neptune alternatives to help you find a suitable replacement. Other interesting open source alternatives to Amazon Neptune are: OceanBase, Memgraph, Hydra, and Pixlie.
Amazon Neptune alternatives are mainly Relational Databases (SQL) but may also be Graph Databases or In-Memory Databases. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Amazon Neptune.
Cloud-native, auto-scaling Postgres with instant branching, bottomless storage, and pay-per-use pricing

Neon Postgres revolutionizes database management with its serverless, cloud-native architecture. Built for modern applications, it offers a powerful combination of features that enhance developer productivity and optimize resource usage.
Key benefits include:
Neon Postgres combines the reliability of traditional databases with the flexibility of cloud-native solutions, making it an ideal choice for startups, enterprises, and everything in between. Experience the future of database management with Neon Postgres.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
Scalable, high-availability database system supporting OLTP, OLAP, and hybrid transactional/analytical processing workloads.

OceanBase is a cutting-edge distributed relational database management system designed to handle massive-scale data processing with unparalleled performance and reliability. Built to meet the demands of modern enterprises, OceanBase offers:
OceanBase's innovative architecture combines the benefits of distributed systems with the familiarity of traditional relational databases, making it an ideal choice for organizations seeking to modernize their data infrastructure while maintaining operational continuity.
Memgraph is a scalable, in-memory graph database solution offering high-performance computing and Neo4j compatibility.

Memgraph is a powerful, in-memory graph database designed for high-performance computing and scalable data analysis. It offers seamless Neo4j compatibility, allowing users to easily transition existing projects or leverage familiar query languages.
Key benefits of Memgraph include:
Memgraph excels in use cases such as fraud detection, recommendation engines, network analysis, and knowledge graphs. Its ability to handle graph sizes from 100 GB to 4 TB makes it suitable for a wide range of applications.
With a strong focus on performance and scalability, Memgraph empowers organizations to unlock the full potential of their connected data, enabling deeper insights and more efficient decision-making processes.
Hydra embeds DuckDB's state-of-the-art analytics engine into standard Postgres, offering millisecond response times for complex queries.

Hydra is an innovative open-source project that combines the power of PostgreSQL with DuckDB's high-performance analytics engine. This hybrid solution allows developers to build faster applications with advanced analytical capabilities right within their Postgres database.
Key features and benefits:
Millisecond response times: Hydra's integration of DuckDB's columnar-vectorized query engine enables lightning-fast analytics on large datasets.
Seamless Postgres integration: Developers can leverage familiar Postgres interfaces and tools while gaining access to DuckDB's analytical prowess.
Open-source and MIT licensed: Hydra is freely available and can be used, modified, and distributed under the permissive MIT license.
Scalability: From laptop to cloud, Hydra is designed to handle varying workloads and data sizes efficiently.
Object storage connectivity: Easily connect with popular object storage solutions like S3, Cloudflare R2, Google GCS, and Azure.
Feature-rich SQL: Take advantage of advanced SQL features for complex data analysis and manipulation.
Zero dependencies: Hydra integrates seamlessly into existing Postgres setups without requiring additional dependencies.
Hydra is backed by Y Combinator and has garnered support from industry leaders, including the DuckDB Foundation, Dagster, Svix, and HashiCorp. Its ability to handle both transactional and analytical workloads in a single database makes it an attractive solution for companies looking to simplify their data architecture while improving query performance.
The project is actively developed and maintained, with regular updates and improvements. Developers can contribute to the project, join the community on Discord, or become supporters to help drive the future of this innovative database solution.
Integrate graph AI into your products to extract valuable insights and reduce costs from your data.

Pixlie AI is an open-source knowledge graph engine that empowers you to unlock actionable insights from your data. By leveraging fast and cost-effective graph-based AI, you can connect your private data with public information to gain a deeper understanding of your business landscape.
Key features:
Experience the power of graph-based AI and transform your data into valuable insights with Pixlie AI. Get started today and unlock the full potential of your information ecosystem.