ScyllaDB vs MongoDB: Which is Better in 2026?
Choosing between ScyllaDB and MongoDB comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: ScyllaDB wins this matchup. PostgreSQL is our overall Data & Databases pick. PostgreSQL is our free Data & Databases pick. Pick MongoDB if you need a free tier to start with.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
ScyllaDB
High-performance NoSQL database
Best for you if:
- • You want fast Cassandra alternative
MongoDB
Document database that made NoSQL mainstream
Best for you if:
- • You want flexible schema for rapid development
| At a Glance | ScyllaDB | MongoDB |
|---|---|---|
Starts at | Free Free plan | Free Free plan |
Category | Data & Databases Cloud & Infrastructure | Data & Databases Cloud & Infrastructure |
Rating | 3.9/5 PeerSpot 3.9 12 reviews | 4.6/5 G2 4.5 · Capterra 4.7 1,376 reviews |
Free plan | Yes | Yes |
Watch out for | n/a | Backup storage costs extra |
Choose ScyllaDB or MongoDB?
Choose ScyllaDB if
- You want fast Cassandra alternative
- You want good performance
Choose MongoDB if
- You want flexible schema for rapid development
- You want excellent for document-oriented data
In-Depth Analysis
ScyllaDB
High-performance NoSQL database
ScyllaDB's pricing is quite fair and generous, especially with a robust open-source option.
Strengths
- Pro: Fast Cassandra alternative
- Pro: Good performance
- Pro: C++ based
- Pro: Active development
- Pro: Good documentation
Weaknesses
- Con: Learning curve
- Con: Cassandra compatibility
- Con: Enterprise features paid
- Con: Operational complexity
- Con: Smaller community
Key features
MongoDB
Document database that made NoSQL mainstream
However, the jump to Dedicated M10 at $57/month and M30 at $389/month can become expensive for growing production workloads, especially considering the storage and RAM provided.
Watch out
Backup storage costs extra
Strengths
- Pro: Flexible schema for rapid development
- Pro: Excellent for document-oriented data
- Pro: Horizontal scaling built-in
- Pro: Atlas cloud service is user-friendly
- Pro: Good for real-time analytics
Weaknesses
- Con: Not ideal for complex relationships
- Con: Transactions less mature than SQL databases
- Con: Can be expensive at scale on Atlas
- Con: Query performance requires proper indexing
- Con: License changes caused community concerns
Key features
Pricing: ScyllaDB vs MongoDB
| Plan | ScyllaDB | MongoDB |
|---|---|---|
| Tier 1 | Free Open Source | $0 Free (M0) |
| Tier 2 | Usage-based Cloud Professional | $0.011/hour Flex Cluster |
| Tier 3 | Custom Cloud Enterprise | $57 Dedicated M10 |
| Tier 4 | N/A | $389 Dedicated M30 |
| Tier 5 | N/A | Custom Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on ScyllaDB pricing and MongoDB pricing.
Key Takeaways
ScyllaDB
- Free tier available
- Our pick for this comparison
MongoDB
- Larger review base (1,376 reviews)
The Bottom Line
ScyllaDB wins this matchup. PostgreSQL is our overall Data & Databases pick. PostgreSQL is our free Data & Databases pick.
Frequently Asked Questions
Is ScyllaDB or MongoDB better in 2026?
ScyllaDB wins this matchup. PostgreSQL is our overall Data & Databases pick. PostgreSQL is our free Data & Databases pick. Pick ScyllaDB for data & databases workflows (main strength: fast Cassandra alternative). Pick MongoDB for data & databases workflows (main strength: flexible schema for rapid development).
What are ScyllaDB and MongoDB used for?
ScyllaDB: High-performance NoSQL database. MongoDB: Document database that made NoSQL mainstream.
What does ScyllaDB cost vs MongoDB?
ScyllaDB pricing is on their site. MongoDB's paid plans start at Free (Flex Cluster).
What's the main difference between ScyllaDB and MongoDB?
ScyllaDB's main strength: fast Cassandra alternative. MongoDB's main strength: flexible schema for rapid development.