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Most buyers should pick MongoDB.
Choose ScyllaDB for workloads where predictable single-digit millisecond latency and high-throughput AI performance matter, and budget for managed service remains a quote-based question: its monthly prices are not published. Choose MongoDB if you want a document model, Atlas search, analytics, streams and AI tools, plus a free M0 tier and Atlas Flex from $8/month. MongoDB is easier to price at entry level, but Atlas costs scale by usage.
01Side by side
| ScyllaDB | MongoDB | |
|---|---|---|
| Starting price | Not published; custom quote for self-managed Enterprise | $8/month Atlas Flex; Dedicated starts at $56.94/month |
| Free plan | No free plan; 30-day Developer trial | Free Atlas M0 forever; 512 MB storage |
| Best for | Low-latency, high-throughput AI workloads at scale | Document-first apps needing search, analytics, or AI |
| Core strength | Predictable single-digit millisecond latency at scale | Flexible document model and single query API |
| Learning curve | Not published | Not published |
| Integrations/data | Positioned as a DynamoDB and Cassandra replacement | Atlas search, streams, analytics, graphs, and vector search |
| Team/seat costs | Resource-based pricing; no per-request charges | Hourly cluster billing; seat pricing not published |
| Support | Tiered 24x7 support; Premium P1 response within 15 minutes | Paid support available; prices not published |
ScyllaDB Choose ScyllaDB if
- Choose ScyllaDB if low-latency AI workloads are your priority.
- Choose ScyllaDB if you need managed multi-region active-active deployment.
- Choose ScyllaDB if resource-based pricing suits your workload.
MongoDB Choose MongoDB if
- Choose MongoDB if you need a flexible document model.
- Choose MongoDB if a free Atlas tier matters.
- Choose MongoDB if you need search, analytics, streams, and vector search.
02Pricing compared
MongoDB is easier to price at the entry level. Atlas has a free M0 tier with 512 MB of storage and a listed limit of up to 100 operations per second. Atlas Flex starts at $8 per month, with usage costs listed at $8–$30 per month. Dedicated clusters start at $56.94 per month; Atlas bills hourly with monthly invoices, and the pricing page lists no annual option.
ScyllaDB Cloud prices are not published. Its pricing is resource-based, with no per-request charges, and it offers a 30-day Developer Free Trial and a 48-hour Production Evaluation. One- and three-year contracts can save up to 70% or more versus on-demand rates, according to its pricing information. Budget separately for possible cross-region transfer and backup storage charges. Self-managed ScyllaDB also requires a custom quote.
03Features and depth
ScyllaDB is aimed at distributed, high-throughput workloads where latency matters. Its homepage describes predictable single-digit millisecond inference latency, feature stores at scale, contextual vector search across billions of embeddings and storage scaling to petabytes. It is also positioned as a DynamoDB and Cassandra replacement. Those are workload claims, not a guarantee that every deployment will meet them.
MongoDB starts with a document model and a single query API for application data. Atlas adds MongoDB Search, vector search, stream processing and analytics; the platform also supports self-managed deployments. Its vector tools are described for semantic search, recommendations, Q&A and generative AI context. Atlas Search supports catalog, content and in-app search, while stream processing targets event-driven applications.
The practical split is workload and data model: ScyllaDB emphasizes latency and throughput at scale, while MongoDB offers a broader document-data platform with search and analytics capabilities. Compare against your actual access patterns and deployment needs, not feature names alone.
04Ease of use and learning curve
MongoDB gives teams a managed Atlas option or self-managed software, and Atlas combines database, search, analytics and stream-processing capabilities. Its free M0 tier provides a low-cost way to explore the platform, though it is limited to 512 MB of storage and up to 100 operations per second.
ScyllaDB offers managed Cloud plans and a self-managed Enterprise option. Cloud tiers differ in deployment and support: Professional adds multi-region active-active HA/DR, while Premium adds a 15-minute 24x7 P1 support response and other controls. The available information does not publish setup times or a direct learning-curve comparison. For either product, choose based on your data model, operations capacity and required service level.
Questions people ask
Which is cheaper, ScyllaDB or MongoDB?
MongoDB is easier to price at entry level: Atlas has a free tier, Flex starts at $8 per month, and Dedicated starts at $56.94 per month. ScyllaDB’s monthly prices are not published, so a direct cost comparison needs a quote and workload details. MongoDB Atlas costs also vary with usage.
Which is better for vector search?
Both list vector-search capabilities. ScyllaDB describes contextual search across billions of embeddings and emphasizes low-latency, high-throughput workloads. MongoDB describes vector search for semantic search, recommendations, Q&A and generative AI context. The published information does not establish a general performance winner.
Does MongoDB have a free plan?
Yes. Atlas Free (M0) is listed as free forever and includes 512 MB of storage, 32 MB of sort memory and up to 100 operations per second. ScyllaDB lists a 30-day Developer Free Trial and a 48-hour Production Evaluation, rather than a free ongoing plan.
Should I choose ScyllaDB or MongoDB for AI workloads?
Choose ScyllaDB if predictable single-digit millisecond latency and high-throughput workloads are central, while accounting for unpublished Cloud pricing. Choose MongoDB if you want a document model alongside Atlas vector search, search, analytics and stream processing, with a free tier and published entry-level pricing.