What is the difference between MongoDB Atlas and Convex?

MongoDB Atlas is best for Teams wanting managed NoSQL database in the cloud, while Convex is best for Full-stack developers wanting a reactive backend. MongoDB Atlas starts at Free and Convex starts at Free.

Is MongoDB Atlas or Convex cheaper?

MongoDB Atlas starts at Free with a free tier. Convex starts at Free with a free tier.

Is there a free alternative to Convex?

Both MongoDB Atlas and Convex offer free tiers.

MongoDB Atlas vs Convex

MongoDB Atlas is Managed MongoDB service with auto-scaling, full-text search, and multi-cloud support, while Convex is reactive backend-as-a-service with real-time sync, scheduled functions, and file storage. MongoDB Atlas is built for teams wanting managed nosql database in the cloud, whereas Convex targets full-stack developers wanting a reactive backend.

At a glance

	MongoDB Atlas	Convex
Best for	Teams wanting managed NoSQL database in the cloud	Full-stack developers wanting a reactive backend
Starting price	Free	Free
Free tier	✓	✓
Open source	—	—
Free tier available	✓	✓
Open source	—	—
Charts	✓	—
Document DB	✓	—
File Storage	—	✓
Multi-Cloud	✓	—
Real-Time Sync	—	✓
Scheduling	—	✓
Search	✓	—
Server Functions	—	✓

MongoDB Atlas

Strengths

Includes Document DB as a core feature, purpose-built for database workflows
Includes Search as a core feature, purpose-built for database workflows
Free M0 cluster — generous enough for most small teams to get real work done
Includes charts alongside the core feature set — fewer separate tools needed

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Fewer built-in features means you may need additional tools to cover gaps
Ecosystem of third-party integrations is smaller than the market leaders in database
Mobile experience lags behind the desktop version in features and polish

Try MongoDB Atlas → Full review

Convex

Strengths

Includes Real-Time Sync as a core feature, purpose-built for database workflows
Includes Server Functions as a core feature, purpose-built for database workflows
Free for small projects — generous enough for most small teams to get real work done
Includes file storage alongside the core feature set — fewer separate tools needed

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Fewer built-in features means you may need additional tools to cover gaps
Ecosystem of third-party integrations is smaller than the market leaders in database
Limited team/admin features if your organization eventually scales up

Try Convex → Full review

The bottom line

Pricing: Both tools offer free tiers, so you can test each before committing. MongoDB Atlas's free plan: Free M0 cluster. Convex's free plan: Free for small projects.

Feature gaps: MongoDB Atlas offers Charts, Document DB and Multi-Cloud that Convex lacks. Convex brings File Storage, Real-Time Sync and Scheduling that MongoDB Atlas does not have.

Team fit: MongoDB Atlas is geared toward any size teams, while Convex is aimed at small teams teams. Pick the one that matches where your team is today and where it is headed — migrating tools later is always painful.

Where each tool shines: MongoDB Atlas's biggest strengths are: includes document db as a core feature, purpose-built for database workflows. includes search as a core feature, purpose-built for database workflows. Convex's biggest strengths are: includes real-time sync as a core feature, purpose-built for database workflows. includes server functions as a core feature, purpose-built for database workflows.

Watch out for: With MongoDB Atlas, users commonly note that free plan exists but key features are locked behind the paid upgrade. With Convex, the main complaint is that free plan exists but key features are locked behind the paid upgrade.

Choose MongoDB Atlas if...

Your profile matches its sweet spot: teams wanting managed nosql database in the cloud
You specifically need Charts and Document DB
You care about includes search as a core feature, purpose-built for database workflows
Your team size fits the any size profile MongoDB Atlas is designed for
The free tier works for you: free m0 cluster

Choose Convex if...

You need a tool built for full-stack developers wanting a reactive backend
You specifically need File Storage and Real-Time Sync
You care about includes server functions as a core feature, purpose-built for database workflows
Your team size fits the small teams profile Convex is designed for
The free tier works for you: free for small projects