Convex
MongoDB
| Feature | Convex | MongoDB |
|---|---|---|
| Pricing | Free / from $25/mo | Free / from $0.1/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.5 / 5 |
| Best For | full-stack-developers, real-time-apps, startups, rapid-prototyping | startups, app-developers, content-management, iot-applications |
| Founded | 2021 | 2007 |
| Real Time Database | ✓ | ✗ |
| Serverless Functions | ✓ | ✗ |
| File Storage | ✓ | ✗ |
| Authentication | ✓ | ✗ |
| Scheduling | ✓ | ✗ |
| Vector Search | ✓ | ✗ |
| Document Storage | ✗ | ✓ |
| Atlas Cloud | ✗ | ✓ |
| Aggregation Pipeline | ✗ | ✓ |
| Full Text Search | ✗ | ✓ |
| Change Streams | ✗ | ✓ |
| Sharding | ✗ | ✓ |
| Time Series | ✗ | ✓ |
| Atlas Search | ✗ | ✓ |
✓ Convex Pros
- Real-time by default
- TypeScript-first
- Built-in auth and file storage
- Automatic caching
✗ Convex Cons
- Vendor lock-in
- Newer platform
- Limited to Convex runtime
✓ 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
Convex is built for full stack developers and real time apps, with a focus on real-time-database and serverless-functions. MongoDB targets startups and app developers and leads with document-storage and atlas-cloud.
On pricing, MongoDB is the clear winner for budget-conscious users — starting at $0.1/mo compared to $25/mo for Convex. That $24.9/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Feature-wise, MongoDB offers broader built-in capabilities (8 features vs 6), while Convex 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.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.