Vault vs AWS Secrets Manager

Overview

HashiCorp Vault and AWS Secrets Manager both store and protect secrets such as database credentials, API keys, and certificates. Vault is a broad, cloud-agnostic secrets and identity platform that you operate (or consume as HCP Vault). AWS Secrets Manager is a fully managed, AWS-native service. The decision balances Vault's power and portability against Secrets Manager's simplicity and integration.

Key Differences

Vault is far more than a secret store. Beyond static secrets, it generates dynamic, short-lived credentials on demand for databases, cloud providers, and other systems, dramatically reducing the blast radius of leaks. It also provides a full PKI engine for issuing certificates, encryption-as-a-service for application data, and fine-grained identity-based access policies. Vault is cloud-agnostic and runs anywhere, making it a strong fit for multi-cloud and hybrid environments. The cost is operational complexity: self-hosted Vault must be deployed, sealed/unsealed, and maintained, and its many secret engines and concepts have a steep learning curve, though HCP Vault offers a managed option.

AWS Secrets Manager focuses on doing one job well within AWS. It stores secrets, encrypts them with KMS, and rotates them, often via managed integrations or Lambda functions. It integrates deeply with IAM for access control and with the AWS SDKs and services, so retrieving a secret from an application running on AWS is trivial. As a fully managed service, it removes operational overhead entirely. The trade-offs are scope and lock-in: it is AWS-only and lacks Vault's dynamic-credential breadth, PKI, and encryption services.

When to Choose Vault

Choose Vault when you need advanced capabilities such as dynamic secrets, PKI, and encryption-as-a-service, or when you operate across multiple clouds and need a portable, centralized secrets and identity platform. It suits organizations willing to invest in operating a powerful, flexible system, or to use HCP Vault to offload that work.

When to Choose AWS Secrets Manager

Choose AWS Secrets Manager when you are AWS-centric and want a simple, fully managed service with deep IAM and KMS integration and minimal operational burden. It is ideal for teams that need reliable secret storage and rotation within AWS without standing up and maintaining additional infrastructure.

Verdict

Vault is the more powerful and portable platform, excelling at dynamic secrets and broad cryptographic services across any environment, at the cost of complexity. AWS Secrets Manager is the simpler, fully managed choice that integrates seamlessly with AWS but stays within that ecosystem. Choose Vault for advanced, multi-cloud secrets management, and Secrets Manager for low-overhead, AWS-native simplicity.