Included with your free cloud database:
512 MB of Storage
Shared RAM
Highly available replica sets, end-to-end encryption, automated patches, REST API
Additionally, get access to the following when you launch a dedicated cluster:
10 GB or more of storage
Dedicated RAM
Performance optimization tools
Backups & point-in-time recovery
Enterprise security features including encryption key management, LDAP integration, and granular database auditing
Global Clusters