MongoDB Atlas offers a flexible pricing structure to accommodate various user needs. The service provides a free tier with limited resources, ideal for learning and small applications. For more demanding workloads, Atlas offers usage-based pricing starting at $9 per month for shared instances and $57 per month for dedicated instances. Pricing is determined by factors such as cluster size, region, cloud provider, and additional services like backups or custom storage speed. Atlas uses a tiered system ranging from M0 (free) to M700, with costs varying based on RAM, storage capacity, and performance requirements. The platform also provides serverless options with pricing based on read operations, starting at $0.10 per million reads. For enterprise-level needs, customized pricing is available, potentially ranging from $20,000 to $150,000 for large-scale deployments.