MongoDB Atlas vs Supabase
Neither wins outright: MongoDB Atlas is cheaper for 1 of 3 workloads and Supabase for the rest.
List prices checked
Rate cards side by side
Only the axes at least one of them bills on. A dash means that provider does not charge for it.
| Billing axis | MongoDB Atlas | Supabase | Difference |
|---|---|---|---|
| Entry plan | $9.00/mo | $25.00/mo | 2.8× MongoDB Atlas |
| Storage | $0.250/GB-mo | $0.125/GB-mo | 2× Supabase |
| Data transfer out | — | $0.090/GB | — |
| Free tier | Yes | Yes | — |
Source: MongoDB pricing (May 2026) · Supabase pricing (May 2026). Published list prices only — committed-use discounts, regional variation, and per-request charges are not included. Not yet independently re-checked against the vendor’s page.
Monthly cost for three real workloads
The rate cards applied to identical usage. This is where the winner changes.
| Workload | MongoDB Atlas | Supabase | Cheaper |
|---|---|---|---|
| Side projectA personal site or small app with modest traffic, a few gigabytes of assets, and one small always-on process. | $14 | $28 | MongoDB Atlassaves $14/mo (49%) |
| Growing SaaSA funded product serving a few thousand daily users, with an image-heavy frontend and two application servers. | $134 | $88 | Supabasesaves $47/mo (35%) |
| Media-heavy siteA publisher or video product where delivery dominates the bill and compute is almost an afterthought. | $509 | $275 | Supabasesaves $234/mo (46%) |
Workload definitions are identical on every comparison page, so figures here can be read against any other pair in the same category.
What each one is for
MongoDB Atlas
by MongoDB
The managed service from MongoDB itself, with a permanently free shared tier and dedicated clusters priced per instance size across three clouds.
Free tier: M0 shared cluster with 512 MB, always free
Supabase
by Supabase
Postgres bundled with auth, object storage, and realtime subscriptions at one per-project price, which replaces several separate services for early-stage products.
Free tier: 500 MB database and 5 GB of egress per month
Common questions
- Is MongoDB Atlas or Supabase cheaper in 2026?
- It depends on volume — MongoDB Atlas wins 1 of the 3 modelled workloads and Supabase wins 2. The scenario table above shows where the crossover falls.
- Which has the better free tier, MongoDB Atlas or Supabase?
- Both publish one. MongoDB Atlas: M0 shared cluster with 512 MB, always free. Supabase: 500 MB database and 5 GB of egress per month.
- What do these estimates not include?
- Committed-use and reserved discounts, regional price variation, per-request API charges, support plans, and minimum retention periods. All of those move real invoices, sometimes by a lot. These figures compare published list prices for the same workload, which is the comparison the rate cards alone cannot give you.