What is the difference between Supabase and MongoDB Atlas?

Supabase is best for Developers who want a full backend with Postgres at the core, while MongoDB Atlas is best for Teams wanting managed NoSQL database in the cloud. Supabase starts at $25/mo and MongoDB Atlas starts at Free.

Is Supabase or MongoDB Atlas cheaper?

Supabase starts at $25/mo with a free tier. MongoDB Atlas starts at Free with a free tier.

Is there a free alternative to MongoDB Atlas?

Both Supabase and MongoDB Atlas offer free tiers.

Supabase vs MongoDB Atlas

Supabase is Open-source Firebase alternative providing a Postgres database, authentication, storage, and edge functions, while MongoDB Atlas is Managed MongoDB service with auto-scaling, full-text search, and multi-cloud support. The biggest difference up front: MongoDB Atlas is free, while Supabase starts at $25/mo. Supabase is built for developers who want a full backend with postgres at the core, whereas MongoDB Atlas targets teams wanting managed nosql database in the cloud.

At a glance

	Supabase	MongoDB Atlas
Best for	Developers who want a full backend with Postgres at the core	Teams wanting managed NoSQL database in the cloud
Starting price	$25/mo	Free
Free tier	✓	✓
Open source	✓	—
Free tier available	✓	✓
Open source	✓	—
Auth	✓	—
Charts	—	✓
Document DB	—	✓
Edge Functions	✓	—
Multi-Cloud	—	✓
Postgres	✓	—
Realtime	✓	—
Search	—	✓
Storage	✓	—

Supabase

Strengths

Full Postgres database with SQL access and extensions
Open source with self-hosting option for full control
Built-in auth, storage, and realtime subscriptions
Generous free tier for prototyping and small projects

Weaknesses

Free tier pauses inactive projects after one week
Edge functions are still maturing compared to alternatives
Connection pooling can be tricky at scale
Dashboard can feel overwhelming with many features

Try Supabase → Full review

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

The bottom line

Pricing: MongoDB Atlas is completely free (Free M0 cluster), which makes it the obvious pick if budget is the top concern. Supabase starts at $25/mo, but Free for 2 projects, pauses after inactivity. That cost buys you a more polished or feature-rich experience, so it comes down to whether the extras justify the spend.

Feature gaps: Supabase offers Auth, Edge Functions and Postgres that MongoDB Atlas lacks. MongoDB Atlas brings Charts, Document DB and Multi-Cloud that Supabase does not have.

Team fit: Both tools target any size teams, so the decision hinges on features and workflow fit rather than scale.

Open source: Supabase is open source, meaning you can self-host, audit the code, and avoid vendor lock-in. MongoDB Atlas is proprietary — you are trusting the vendor with your data and uptime.

Where each tool shines: Supabase's biggest strengths are: full postgres database with sql access and extensions. open source with self-hosting option for full control. 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.

Watch out for: With Supabase, users commonly note that free tier pauses inactive projects after one week. With MongoDB Atlas, the main complaint is that free plan exists but key features are locked behind the paid upgrade.

Choose Supabase if...

Your profile matches its sweet spot: developers who want a full backend with postgres at the core
You need self-hosting, data sovereignty, or the ability to audit source code
You specifically need Auth and Edge Functions
You care about open source with self-hosting option for full control
The free tier works for you: free for 2 projects, pauses after inactivity

Choose MongoDB Atlas if...

Your profile matches its sweet spot: teams wanting managed nosql database in the cloud
Budget is a hard constraint — MongoDB Atlas is free, Supabase is not
You specifically need Charts and Document DB
You care about includes search as a core feature, purpose-built for database workflows
The free tier works for you: free m0 cluster