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MongoDB Atlas vs Supabase: which free plan?
Both free plans are on a par by our score. The differences below decide it.
Both checked against their official pricing pages on 1 Nov 2026.
| Type | Managed MongoDB | Postgres BaaS |
|---|---|---|
| Free-tier score | 87 / 100 | 87 / 100 |
| Card to sign up | Not required | Not required |
| Free plan ends | Never | Never |
| Sleeps when idle | Paused after 30 days with zero connections | Paused after 1 week of inactivity |
| Commercial use | Allowed | Allowed |
| Own domain on free | Not stated | No |
| Free subdomain | None | *.supabase.co (API URL) |
| Free limits |
|
|
| The catch | 512 MB fills quickly, and there is a 100 ops/sec cap. | Free projects pause after a week without activity. |
| Paid from | Usage-based | $25/mo (Pro) |
| Source | Official pricing for MongoDB Atlas (opens in a new tab) | Official pricing for Supabase (opens in a new tab) |
Which one should you pick?
Pick MongoDB Atlas if…
- your project is: document databases for side projects
Pick Supabase if…
- your project is: full-stack apps on Postgres
Questions
Which is better for free, MongoDB Atlas or Supabase?
Both free plans are on a par by our score. The differences below decide it.
Does MongoDB Atlas or Supabase need a credit card?
MongoDB Atlas: no. Supabase: no.
What is the catch with MongoDB Atlas and Supabase?
MongoDB Atlas: 512 MB fills quickly, and there is a 100 ops/sec cap. Supabase: Free projects pause after a week without activity.