Fauna
MongoDB
| Feature | Fauna | MongoDB |
|---|---|---|
| Pricing | Free / from $0.01/mo | Free / from $0.1/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.1 / 5 | 4.5 / 5 |
| Best For | serverless-developers, jamstack-apps, globally-distributed-apps, startups | startups, app-developers, content-management, iot-applications |
| Founded | 2012 | 2007 |
| Acid Transactions | ✓ | ✗ |
| Document Relational | ✓ | ✗ |
| Graphql Native | ✓ | ✗ |
| Global Distribution | ✓ | ✗ |
| Event Streaming | ✓ | ✗ |
| Multi Tenancy | ✓ | ✗ |
| Temporality | ✓ | ✗ |
| Document Storage | ✗ | ✓ |
| Atlas Cloud | ✗ | ✓ |
| Aggregation Pipeline | ✗ | ✓ |
| Full Text Search | ✗ | ✓ |
| Change Streams | ✗ | ✓ |
| Sharding | ✗ | ✓ |
| Time Series | ✗ | ✓ |
| Atlas Search | ✗ | ✓ |
✓ Fauna Pros
- Globally distributed with strong consistency
- Combines document and relational models
- Native GraphQL and FQL query support
- Serverless with no infrastructure to manage
✗ Fauna Cons
- Proprietary query language (FQL) has learning curve
- Can be expensive at high read/write volumes
- Smaller community compared to MongoDB or PostgreSQL
✓ MongoDB Pros
- Flexible document model handles varied data structures
- Atlas cloud service simplifies deployment and scaling
- Excellent developer experience and documentation
- Strong aggregation framework for complex queries
- Horizontal scaling with built-in sharding
✗ MongoDB Cons
- Not ideal for highly relational data
- Atlas costs can escalate with heavy usage
- Transactions less mature than relational databases
The Verdict
Fauna is built for serverless developers and jamstack apps, with a focus on acid-transactions and document-relational. MongoDB targets startups and app developers and leads with document-storage and atlas-cloud.
Both tools come in at similar price points ($0.01/mo for Fauna, $0.1/mo for MongoDB), so pricing won't make the decision for you.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
MongoDB edges out on user ratings (4.5 vs 4.1). While both are well-regarded, that gap reflects real differences in user satisfaction worth considering.
Feature-wise, MongoDB offers broader built-in capabilities (8 features vs 7), while Fauna takes a more focused approach — which can mean a simpler, faster onboarding experience.
Both tools are a solid fit for startups — in those cases, the decision often comes down to workflow style and how your team prefers to organize work.
Bottom line: MongoDB has a slight overall edge — but if globally distributed with strong consistency matters most to you, Fauna may still be the right call.