AWSGlossary

Secrets Manager vs Parameter Store: What It Is and When to Use It

Definition

AWS Secrets Manager and AWS Systems Manager Parameter Store are two core services for managing configuration data and secrets, such as passwords, database connection strings, and API keys. Secrets Manager is a dedicated secret management service that simplifies the entire secret lifecycle, including rotation, auditing, and access control. Parameter Store provides secure, hierarchical storage for configuration data and secrets as key-value pairs, offering a simpler, often lower-cost solution for static configuration.

How It Works

Both services provide a centralized and secure location to store sensitive information, abstracting it from application code. Applications retrieve this data at runtime via API calls, using permissions granted by AWS Identity and Access Management (IAM). The core difference lies in their feature sets and intended use cases.

AWS Secrets Manager is designed for the full lifecycle management of secrets. It stores secrets as encrypted JSON blobs, and a key feature is its built-in capability to automatically rotate credentials for supported AWS services like Amazon RDS, Amazon DocumentDB, and Amazon Redshift. This rotation is handled by an AWS Lambda function that Secrets Manager invokes on a schedule you define. During rotation, it uses staging labels (AWSCURRENT, AWSPENDING, AWSPREVIOUS) to manage different versions of a secret, ensuring applications can transition to new credentials without downtime.

AWS Systems Manager Parameter Store organizes data into a hierarchy, similar to a file system (e.g., /myapplication/production/database_url). It offers two tiers: Standard and Advanced.

  • Standard Tier: This is a free tier suitable for basic configuration data. It has limits on the number of parameters (10,000), value size (4 KB), and API throughput.
  • Advanced Tier: This is a paid tier that increases the limits for the number of parameters (100,000) and value size (8 KB), allows for higher API throughput, and enables the use of Parameter Policies (e.g., for setting expiration notifications).

Parameters can be stored as plain text (String) or encrypted (SecureString). When using SecureString, Parameter Store integrates with AWS Key Management Service (KMS) to encrypt and decrypt the parameter value.

Feature Comparison Table

| Feature | AWS Secrets Manager | AWS Systems Manager Parameter Store | | :--- | :--- | :--- | | Primary Use Case | Lifecycle management of secrets (passwords, API keys) | Storing application configuration and static secrets | | Automatic Rotation | Yes, built-in and customizable via AWS Lambda. | No built-in rotation; requires custom automation (e.g., a scheduled Lambda function). | | Secret Size | Up to 64 KB. | Standard: Up to 4 KB. Advanced: Up to 8 KB. | | Pricing Model | Per secret per month + per 10,000 API calls. | Standard: Free. Advanced: Per parameter per month + per API interaction. | | Cross-Account Access | Yes, via resource-based policies. | Yes, via AWS Resource Access Manager (RAM) for shared parameters. | | Auditing | Deep integration with AWS CloudTrail for lifecycle events (e.g., rotation) and secret access. | Integration with AWS CloudTrail for API calls (e.g., GetParameter). | | Parameter Policies | Not applicable. | Yes, for Advanced Parameters (Expiration, ExpirationNotification, NoChangeNotification). | | API Throughput | High throughput, with limits up to 10,000 TPS for GetSecretValue. | Standard: Lower throughput. Advanced: Higher throughput (up to 10,000 TPS for GetParameter). | | Encryption | Always encrypted at rest using AWS KMS. | Optional for String type; mandatory for SecureString type using AWS KMS. |

Key Features and Limits

AWS Secrets Manager

  • Automatic Secret Rotation: Natively supports rotation for Amazon RDS, DocumentDB, and Redshift, and can be extended to other services via custom Lambda functions.
  • Cross-Region Replication: Can automatically replicate secrets to other AWS Regions for disaster recovery and multi-region applications.
  • Fine-Grained Access Control: Uses a combination of IAM identity-based policies and resource-based policies for precise control over who can access which secret.
  • Service Quotas (2026):
    • Secrets per account: 500,000 per Region.
    • Secret size: Up to 64 KB.
    • API Request Rate: High limits, such as 10,000 transactions per second (TPS) for GetSecretValue.

AWS Systems Manager Parameter Store

  • Hierarchical Organization: Parameters can be organized using paths, making them easier to manage (e.g., /prod/app/db_password).
  • Tiered Service: Offers a free Standard tier for basic needs and a paid Advanced tier for more demanding workloads.
  • Parameter Policies: Advanced parameters support policies to enforce rules, such as notifying when a parameter is about to expire.
  • Service Quotas (2026):
    • Number of parameters: 10,000 (Standard), 100,000 (Advanced) per Region.
    • Parameter value size: 4 KB (Standard), 8 KB (Advanced).
    • API Request Rate: Throughput can be increased for a fee, up to 10,000 TPS.

Common Use Cases

Choose AWS Secrets Manager when:

  1. You need to automatically rotate credentials. This is the primary differentiator. It's the best choice for database credentials (RDS, Redshift, DocumentDB) or API keys that must be changed regularly for security compliance.
  2. You require fine-grained, cross-account secret sharing. Secrets Manager's resource-based policies make it simpler and more direct to share specific secrets with other AWS accounts.
  3. You are managing highly sensitive credentials with strict auditing requirements. Secrets Manager provides more detailed audit trails via CloudTrail for the entire secret lifecycle, including rotation events.

Choose AWS Systems Manager Parameter Store when:

  1. You are storing application configuration data. It is ideal for storing non-sensitive or static sensitive data like feature flags, service endpoints, and AMI IDs.
  2. Cost is a primary concern. The Standard tier is free, making it a highly cost-effective solution for storing thousands of configuration values that do not require rotation.
  3. You need a simple key-value store for secrets that are rotated manually. For API keys from third-party services that don't support automated rotation, storing them as a SecureString parameter is a secure and low-cost option.
  4. You need higher API throughput for configuration reads. With the higher throughput setting enabled, Parameter Store can handle very high request rates for configuration data.

Pricing Model

  • AWS Secrets Manager: You are charged for the number of secrets stored per month and the number of API calls made.

    • Storage: ~$0.40 per secret per month (prorated hourly).
    • API Calls: ~$0.05 per 10,000 API calls.

  • AWS Systems Manager Parameter Store: The pricing depends on the tier.

    • Standard Tier: Free to use for up to 10,000 parameters. There are no additional charges for standard throughput API calls.
    • Advanced Tier: You are charged for the number of advanced parameters stored per month and for API interactions.
      • Storage: ~$0.05 per advanced parameter per month.
      • API Interactions: ~$0.05 per 10,000 API interactions.

Always consult the official AWS Pricing page for the most current details.

Pros and Cons

AWS Secrets Manager

  • Pros:
    • Built-in, automated secret rotation reduces security risks from long-lived credentials.
    • Stronger security posture with resource-based policies and detailed auditing.
    • Natively integrates with AWS database services for seamless credential management.
    • Supports larger secret sizes (64 KB).
  • Cons:
    • Higher cost due to the per-secret monthly fee.
    • Can be overkill for simple configuration data.

AWS Systems Manager Parameter Store

  • Pros:
    • Extremely cost-effective, with a generous free tier for standard parameters.
    • Simple and effective for storing application configuration and static secrets.
    • Hierarchical organization helps manage configuration across different environments.
    • Advanced tier offers a good middle-ground with more features than the standard tier at a lower cost than Secrets Manager.
  • Cons:
    • No built-in automatic rotation, requiring custom solutions for credential lifecycle management.
    • Smaller storage size limits compared to Secrets Manager.
    • Standard tier has lower API throughput limits, which might require upgrading for high-traffic applications.

Comparison with Alternatives

  • HashiCorp Vault: A popular third-party, open-source tool for secrets management. Vault offers more advanced features like dynamic secrets for a wider range of backends, secret leasing/revocation, and can be run on any infrastructure (on-premises or any cloud). However, it requires you to manage the infrastructure, high availability, and operational overhead yourself, unlike the fully managed AWS services.
  • Environment Variables: Storing secrets in environment variables is a common practice but is generally considered less secure. Secrets can be exposed through logs, child processes, or system introspection tools. Secrets Manager and Parameter Store provide a much more secure alternative by centralizing secrets, encrypting them at rest, and controlling access via IAM.

Exam Relevance

This is a critical topic for several AWS certifications, especially:

  • AWS Certified Solutions Architect - Associate (SAA-C03)
  • AWS Certified Developer - Associate (DVA-C02)
  • AWS Certified Security - Specialty (SCS-C02)
  • AWS Certified DevOps Engineer - Professional (DOP-C02)

Examinees must know the key differences between the two services. Questions often present a scenario and ask you to choose the most appropriate and/or cost-effective service. Key points to remember for exams are:

  • Rotation: If the question mentions rotating credentials (especially for databases), the answer is almost always Secrets Manager.
  • Cost: If the question is about storing configuration data or static keys in the most cost-effective way, Parameter Store (Standard) is the correct choice.
  • Use Case: Secrets Manager is for secrets that have a lifecycle. Parameter Store is for configuration data and static secrets.

Frequently Asked Questions

Q: Can Parameter Store rotate secrets?

A: Not natively. While AWS Secrets Manager has built-in, automated rotation capabilities, Parameter Store does not. You can build a custom solution to rotate secrets in Parameter Store by using an AWS Lambda function triggered by an Amazon EventBridge schedule, but you are responsible for creating and maintaining this automation.

Q: Which service is more secure?

A: Both services are highly secure and use AWS KMS for encryption. However, Secrets Manager is arguably more secure for managing credentials due to its core features. Its automated rotation capability is a significant security advantage, as it minimizes the risk associated with long-lived, static credentials. Additionally, its resource-based policies offer more granular access control compared to the IAM-only policies of Parameter Store.

Q: How do I choose between Secrets Manager and Parameter Store?

A: The choice depends on your specific needs. Use this simple decision framework:

  • For credentials that need to be rotated automatically (e.g., database passwords): Use AWS Secrets Manager.
  • For application configuration, feature flags, or static secrets that don't need rotation: Use AWS Systems Manager Parameter Store.
  • If cost is the most critical factor for static data: Use Parameter Store's free Standard tier.
  • If you need to share specific secrets across AWS accounts easily: Use AWS Secrets Manager for its resource-based policies.

This article reflects AWS features and pricing as of 2026. AWS services evolve rapidly — always verify against the official AWS documentation before making production decisions.

Published: 5/21/2026 / Updated: 5/21/2026

This article is for informational purposes only. AWS services, pricing, and features change frequently — always verify details against the official AWS documentation before making production decisions.

More in Security

AWS Firewall Manager: Simplify Security Policy Management

AWS Firewall Manager centrally manages firewall rules and security policies across your AWS Organization. Ensure consistent enforcement and compliance. Learn how it works.

KMS Envelope Encryption: How It Works & When to Use It

KMS Envelope Encryption encrypts data with a DEK, then encrypts the DEK with a KMS key. Learn its two-tiered approach for secure, efficient data protection.

IAM Condition Keys: Fine-Grained Access Control Explained

IAM Condition Keys are key-value pairs in IAM policies for context-aware access control. Learn how they restrict permissions and when to use them.

IAM Policy Evaluation Logic: How It Works & When to Use It

Understand AWS IAM Policy Evaluation Logic: the process for allowing or denying resource access. Learn how it synthesizes policies for authorization decisions. See examples.

Resource-Based vs Identity-Based Policies: How to Use Them

Understand AWS IAM identity-based vs resource-based policies. Learn what they are, how they differ, and when to use each for effective AWS security. See examples.

View all Security terms →