Is Supabase cheaper than Cloud SQL?
When you are choosing where to host Postgres, price is rarely the only thing that matters, but it is often what decides it. And "cheaper" is slippery, so to be precise: here it means the real monthly bill to run the same workload on each service, worked out from published rates, not a sticker price or an intro discount.
For Supabase versus Cloud SQL, there is no single answer, because they bill on different models. Supabase is $25/mo Pro floor, then compute add-ons and usage. Cloud SQL is per vCPU-hour + per GB-RAM-hour, 24/7. Which one wins comes down to how big an instance you need.
So this page settles it with real numbers: we compute the monthly bill for Supabase and Cloud SQL across a range of usage, find the exact point where the cheaper option flips, then look past price at the tradeoffs that decide a real migration. Prices were last verified 2026-08-01.
Short answer: Across our reference range, Cloud SQL is the cheaper of the two at every point we checked.
- The break-even point, charted
- What tips the balance between them
- Each provider's real gotchas and tradeoffs
- Which one to choose
- A calculator for your exact numbers
Where the answer flips
This matchup turns on how big an instance you need. The chart plots each provider’s monthly bill as that changes, holding always-on, at 25 GB storage. One stays cheaper the whole way.
What tips the balance
They price out differently because of how each one bills. Supabase: Platform pricing: a free tier, then a $25/mo Pro floor plus a per-project compute add-on (Micro $10 up to 2XL $410) billed hourly, with storage and egress over generous allowances.
Cloud SQL: Priced per vCPU-hour and per GB of RAM-hour separately, billed around the clock with no scale-to-zero. Committed-use discounts cut compute by about 25% for one year or 52% for three years.
So the honest answer is not a single number, it is a curve. Across our reference range, Cloud SQL is the cheaper of the two at every point we checked. The one gotcha that catches people on Supabase: Compute never scales to zero on paid plans, and the included $10 credit covers only one Micro instance, so every extra project (staging, preview, production) stacks its own around-the-clock charge. It is structurally never the cheapest option for a tiny or idle database. On Cloud SQL: RAM is a separate line item, so memory-heavy tiers cost more than people budget for, and RAM can end up the larger half of the bill. Turning on regional high availability roughly doubles the compute cost and raises the storage rate.
Beyond price: the two, side by side
Price is only half the decision. Here is what each one is actually like to run.
Supabase
Platform pricing: a free tier, then a $25/mo Pro floor plus a per-project compute add-on (Micro $10 up to 2XL $410) billed hourly, with storage and egress over generous allowances.
Compute never scales to zero on paid plans, and the included $10 credit covers only one Micro instance, so every extra project (staging, preview, production) stacks its own around-the-clock charge. It is structurally never the cheapest option for a tiny or idle database.
- Bundles Postgres with Auth, Storage, Realtime, and Edge Functions under one bill.
- Free projects pause after 7 days of inactivity and keep no backups.
- Automatic failover is Enterprise-only, and a read replica bills as a full extra instance.
- Built-in Supavisor pooler: session mode on 5432, transaction mode on 6543.
- The direct connection is IPv6 by default; IPv4 needs a $4/mo add-on or the session pooler.
From a Mac client: Use the direct connection (port 5432) from a desktop GUI; its limit scales with compute, from 60 on Micro to about 500 at the top tiers. On an IPv4-only network, use Supavisor session mode.
Cloud SQL
Priced per vCPU-hour and per GB of RAM-hour separately, billed around the clock with no scale-to-zero. Committed-use discounts cut compute by about 25% for one year or 52% for three years.
RAM is a separate line item, so memory-heavy tiers cost more than people budget for, and RAM can end up the larger half of the bill. Turning on regional high availability roughly doubles the compute cost and raises the storage rate.
- Deep GCP integration: IAM database auth, the Auth Proxy, free same-region egress.
- Regional HA stands up a synchronous standby, at roughly 2x compute.
- Read replicas each bill as a full separate instance.
- Committed-use discounts apply to compute only, not storage, egress, or IP addresses.
- max_connections scales with instance RAM, and small tiers cap around 50.
From a Mac client: The Cloud SQL Auth Proxy secures the connection but does not pool, so each GUI connection is a real backend connection. Built-in managed pooling requires the Enterprise Plus edition.
Which should you choose
Run your exact numbers
Move the sliders for your compute, active hours, and storage, and see Supabase, Cloud SQL, and the others side by side.
Open the comparatorHow we worked this out
Every figure is computed from each provider’s published on-demand rates, single region, last verified 2026-08-01. We count compute and storage. We do not count backups, support, data transfer beyond the noted allowances, high availability or Multi-AZ, or committed-use and reserved discounts, any of which can move a real bill.
The chart holds always-on, at 25 GB storage and varies only the compute size, so the curve isolates the one variable that decides this matchup. Your own mix will differ, which is what the comparator is for.
Is Supabase cheaper than Cloud SQL?
Across our reference range, Cloud SQL is the cheaper of the two at every point we checked. At 0.25 CU the two cost $37.13 and $16.90 in our reference case; at 8 CU they cost $437 and $409. Run your own numbers in the comparator.
What decides whether Supabase or Cloud SQL is cheaper?
Mostly how big an instance you need. Supabase bills its instance around the clock, while Cloud SQL bills its instance around the clock. Compute size and storage move the number too.
When should I pick Supabase over Cloud SQL?
Pick Supabase for Full-stack app backends that actually use the bundled auth, storage, realtime, and edge functions, with steady enough traffic to justify an always-on instance. Pick Cloud SQL for Steady, always-on production databases, especially when you are already on Google Cloud and can commit to one- or three-year use for the compute discount.
Whichever you pick, FluentDB is the Mac client for it.
Download FluentDB for Mac