Database & Backend Platform · decision tool

MongoDB Atlas vs Supabase — for your app, not in general

MongoDB Atlas or Supabase? Set your usage, budget and constraints; the verdict, monthly cost and risks update live from verified pricing.

Prices verified 2026-07-15 against official pricing pages · fit weights are our estimates (see methodology) · share the URL to share your configuration

As of Jul 2026, with 5,000 monthly active users, 5 GB database size, 40 GB monthly egress, 1,000 db operations per user / month, 24 compute active hours / day, a $50 budget for this slot, Supabase ranks first for these inputs at 95% fit and a StackSays-estimated $25.00/month (MongoDB Atlas: 80% fit, $8.00/month). Fit weights are our estimates; prices trace to official pages. Change any input below and the verdict recomputes.

Your situation

The verdict updates as you move these.

Monthly active userspeople actually hitting the app each monthDatabase size (GB)rows + indexes; a typical early SaaS is 1–10GBMonthly egress (GB)data served out of the DB/API to clientsBudget for this slot ($/mo)what you'd accept paying for the database layerTeam size1 = solo; bundled platforms save glue time for small teams

Clear pick for your inputs

Supabasefit 95% · est $25.00/mo

Managed Postgres bundled with auth, realtime, storage and edge functions

vs MongoDB Atlas: fit 95% against 80%, est $25.00 against $8.00–$30.00 per month

Supabasefit 95%

$25.00/mo

MongoDB Atlasfit 80%

$8.00–$30.00/mo

Comparing 2 tools head-to-head. Open the full field (7 options) →

The decision, in plain words

For a solo builder at 5,000 monthly active users and a $50.00/mo budget for the database slot, Supabase leads at 95% fit and $25.00/mo. The two rules doing the work: budget fit (~$25/mo is 50% of your $50/mo budget); batteries included (Bundles auth, file storage, realtime — fewer services to glue at team size 1).

The gap to MongoDB Atlas (80% fit) is wide at these inputs — you'd need to change your requirements, not your taste, to flip it.

Generated from the calculation above — every number traces to the sourced data; nothing here is written by an AI making things up.

Why Supabase scores 95%

Budget fit (weight 30, our estimate) — ~$25/mo is 50% of your $50/mo budget+30

Batteries included (weight 12, our estimate) — Bundles auth, file storage, realtime — fewer services to glue at team size 1+12

Exit cost (weight 4, our estimate) — Standard Postgres — dump and restore anywhere+4

Ecosystem maturity (weight 8, our estimate) — established — our estimate from ecosystem age, docs and hiring pool+8

Free-tier runway (weight 10, our estimate) — Free tier exists (500MB database, 50K MAU, 1GB file storage, 5GB egress, 2 projects) — a cheap staging/dev lane even after you outgrow it+4

Total (lines sum exactly)58

Possible range −64…+64 (sum of active rule weights) · fit % = (total + max) / (2 × max)(58 + 64) / 128 = 95%

How the $25.00/mo estimate is calculated

Pro plan base — includes 8GB database storage, 250GB egress, 100,000 auth mau, 100GB file storage$25.00

Monthly total (lines sum exactly)$25.00

What could change this verdict

Cost risk

Estimated now (StackSays estimate, not your final bill)$25.00/mo · Pro plan

Free-tier statusFree tier exceeded (database storage 5GB > 0.5GB cap)

Next known billing thresholdat 8GB database storage, overage starts ($0.125/GB)

Official prices verified 2026-07-15; calculation is deterministic code over those prices.

At a glance

Tool	Free tier	Paid entry	Verified
Supabase	500MB database, 50K MAU, 1GB file storage, 5GB egress, 2 projects	Pro plan $25/mo	2026-07-15
MongoDB Atlas	512MB storage, shared CPU/RAM, ~100 ops/sec cap	Flex tier $8/mo	2026-07-15

Where did you land?anonymous, one click

Data sources

Tool	Source	Verified
Supabase	Supabase pricing page	2026-07-15
MongoDB Atlas	MongoDB Atlas pricing page	2026-07-15

A monitor re-checks these pages for changes; when a vendor moves a price, the date updates and every verdict recomputes.

Keep deciding