| Secret Manager | SSM Parameter Store | |
|---|---|---|
| Data Limit | 64Kb | 4Kb or 8Kb |
| Encryption using KMS | ✅ Yes | ✅ Yes |
| Reference in Cloudformation | ✅ Yes | ✅ Yes |
| Built-In password generator | ✅ Yes | ❌ No |
| Automatic rotation | ✅ Yes | ❌ No |
| Cross-Account Access | ✅ Yes | ❌ No |
| Pricing | Not-Free | 👍 Free for standard params - Advanced parameters are charged per param & API transaction. |