Amazon Neptune

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What Amazon Neptune is

Amazon Neptune is a cloud-deployed, fully managed graph database service for applications that use connected data. It supports Apache TinkerPop Gremlin, openCypher, and SPARQL, along with ACID transactions, graph algorithms, and vector search. Neptune Serverless can adjust database capacity to workload demand for Neptune Database, with capacity measured in NCUs and a 1 NCU starting point. Neptune Database storage can grow to 128 TiB in supported AWS Regions, excluding China and GovCloud, and a cluster can have up to 15 read replicas. Integrations include AWS Glue, Amazon SageMaker AI, and AWS Lambda. A managed Jupyter notebook environment hosted by SageMaker AI supports graph queries and result visualization. Neptune offers encryption at rest with AWS Key Management Service keys and requires TLS 1.2 or later. It is paid and includes a 30-day trial.

Who it suits

Neptune suits developers and teams building connected-data applications that need managed graph queries, scaling, replicas, and AWS integrations.

What it does well

Supports three graph query languages
Serverless capacity scales with demand
Up to 15 read replicas
Managed graph notebooks are provided
Encryption at rest and TLS connections

What to know first

No free plan is listed
Storage and I/O are billed separately
Pricing varies by configuration and Region
Neptune ML support depends on Region availability

Plans

Plan	Billed and limits	Price
On-demand	By the hour for database instances; storage and I/O are billed separately. · No minimum fees · No upfront fees · Cost varies by configuration and AWS Region	On request
Serverless	1 NCU starting capacity · Up to 15 read replicas	On request
Neptune Serverless	Per second for database capacity, plus storage while active. · Neptune Database only · Capacity measured in NCUs · Starting capacity 1 NCU	On request
Database Savings Plans	Commit to a specific amount of eligible usage, measured in $/hour, over a 1-year term. · Savings depend on commitment and eligible usage	On request

As aws.amazon.com lists them, read 3 Oct 2026. The maker's own page has the final word.

Verdict

Amazon Neptune offers managed graph capabilities with multiple query languages, scaling options, replicas, and AWS services. Costs depend on configuration, Region, storage, and I/O, so deployment details matter.

Facts from Amazon Neptune's own pages

Compliance: AWS states that Neptune has over 20 international compliance standards and is HIPAA eligible. · aws.amazon.com, 3 Oct 2026
Encryption: Neptune supports encryption at rest using AWS Key Management Service keys and requires TLS 1.2 or later for connections. · aws.amazon.com, 3 Oct 2026
Free plan: No · aws.amazon.com, 22 Sept 2026
Free trial: New Neptune customers can use specified Database instance hours, I/O requests, storage, and backup storage free for 30 days from creating their first Neptune Database cluster. · aws.amazon.com, 3 Oct 2026
Graph notebooks: Neptune provides a managed Jupyter notebook environment hosted by SageMaker AI for running graph queries and visualizing results. · aws.amazon.com, 3 Oct 2026
Integrations: Neptune documentation describes integrations with AWS Glue, Amazon SageMaker AI, and AWS Lambda. · docs.aws.amazon.com, 3 Oct 2026
Neptune ML limits: Neptune ML is available only in Regions where Neptune and its dependent services are all supported. · docs.aws.amazon.com, 3 Oct 2026
Product: Amazon Neptune is a fully managed graph database service for building and running applications that work with connected data. · aws.amazon.com, 3 Oct 2026
Query languages: Neptune supports Apache TinkerPop Gremlin, openCypher, and SPARQL. · aws.amazon.com, 3 Oct 2026
Read replicas: A Neptune Database cluster can have up to 15 read replicas. · aws.amazon.com, 3 Oct 2026
Security responsibility: AWS describes Neptune security as a shared responsibility: AWS protects the cloud infrastructure, while customers are responsible for security in the cloud. · docs.aws.amazon.com, 3 Oct 2026
Serverless scaling: Neptune Serverless automatically scales database capacity up or down with workload demand and is available for Neptune Database. · aws.amazon.com, 3 Oct 2026
Storage limit: Neptune Database storage can grow to a maximum of 128 TiB in supported AWS Regions, except China and GovCloud. · aws.amazon.com, 3 Oct 2026
Vector search: Yes · aws.amazon.com, 22 Sept 2026