Supabase vs Firebase vs Neon 2026 Compared

All three give you a managed database, auth, and storage, so on a feature checklist they read almost identically. The bill is where they diverge, and one of them can hurt: Supabase charges a flat, predictable $25, Neon scales down to a few dollars when idle, and Firebase runs usage-based with no hard spend cap, so a runaway query can spike the invoice. The real choice is not features, it is which billing model matches how your traffic actually behaves. This article puts the verified prices side by side and maps each model to a traffic shape.

1. Headline prices and free tiers

Prices verified against each vendor's pricing page as of May 26, 2026.

Backend	Free tier	Entry paid	Billing model
Supabase	Free $0 (500MB DB, 50K MAU)[1]	Pro $25/mo (8GB DB, 100K MAU)[1]	Flat per project
Firebase	Spark $0 (generous quotas)[2]	Blaze pay-as-you-go[2]	Usage, no hard cap
Neon	Free $0 (100 CU-hrs, 0.5GB)[3]	Launch $0.106/CU-hr + $0.35/GB-mo[3]	Usage, scale-to-zero

Supabase is the only one with a flat paid entry ($25/month for the Pro plan, Team is $599)^[1]. Firebase Blaze and Neon are both usage-based, but Neon suspends compute when idle while Firebase keeps billing whatever you consume^[2][3]. All three keep a real free tier, so trying any costs nothing.

2. Flat, scale-to-zero, and uncapped

The billing model is the real decision:

• Supabase (flat): Pro is $25/month per project regardless of how heavily the database is used; compute runs continuously, so there are no idle savings but also no usage surprises^[1].
• Neon (scale-to-zero): Launch bills $0.106 per compute-unit-hour plus $0.35 per GB-month, and compute auto-suspends after inactivity, so an idle database stops billing compute^[3].
• Firebase Blaze (uncapped usage): a generous free allocation then pay-as-you-go (around $0.18 per 100,000 Firestore reads), with no default hard spending cap^[2].

So the cheapest depends entirely on traffic shape. A steady always-on app makes Supabase's flat $25 predictable. A bursty side project that sits idle most of the day is far cheaper on Neon, which stops charging compute while quiet. Firebase fits when you want deep Google ecosystem integration and a generous free tier, provided you set budget alerts.

3. The bill-spike risk

The one model that can hurt you is uncapped usage. Firebase Blaze has no hard spending cap by default, so a viral spike or a coding bug that loops Firestore reads can run the bill to hundreds or thousands of dollars in a single day^[2]. The per-operation cost is tiny ($0.18 per 100,000 reads), but the aggregate is unbounded unless you configure budget alerts and usage limits.

Supabase's flat Pro fee caps your downside at the plan price plus any explicit add-ons, and Neon's metered model is bounded by the resources you actually provision and suspends when idle. For a solo founder who cannot babysit a dashboard, that bounded downside is worth real money. If you do choose Firebase, set budget alerts before launch, not after.

4. Worked cost example

Two scenarios, looking only at the backend cost (not bandwidth or add-ons):

Scenario	Supabase	Neon	Firebase
Bursty side project (mostly idle)	$25/mo flat[1]	A few $/mo (scale-to-zero)[3]	$1 to $10/mo (free allocation)[2]
Steady always-on app	$25/mo flat[1]	Climbs with continuous compute[3]	Climbs with read/write volume[2]

The pattern: for the idle/bursty project, Neon's scale-to-zero and Firebase's free allocation undercut Supabase's flat $25, often landing at a few dollars. For the steady always-on app, Supabase's flat fee stops being a penalty and becomes the predictable choice, while Neon's continuous compute and Firebase's read volume both climb. The decision is your traffic shape, not a single headline price. Fold the backend line into your monthly costs with the monthly burn rate calculator, and if you are storing embeddings, compare against the embeddings DB cost calculator.

5. Decision guidance

• Steady always-on app, predictable bill: Supabase Pro at $25/mo flat.
• Bursty side project or internal tool that sits idle: Neon, where scale-to-zero drops the bill to a few dollars.
• Deep Google ecosystem, generous free tier: Firebase Spark/Blaze, with budget alerts set before launch.
• Cannot risk a surprise bill: Supabase (flat) or Neon (bounded), not uncapped Blaze.
• Just prototyping: all three have real free tiers; start at $0.

Re-verify each pricing page before committing; backend pricing and free-tier limits change, and Supabase notes its pricing is in beta. For the hosting layer above the database, see Railway vs Render vs Fly pricing, and for vector-search specifics, Supabase vector free tier.

All pricing figures verified against official pricing pages as of 2026-05-26.

Frequently asked questions

Is Supabase, Firebase, or Neon cheapest in 2026?

It depends on traffic shape. Supabase Pro is a flat $25 per month regardless of how much the database is used, so it is predictable but not free at idle. Neon bills pay-as-you-go and suspends compute after inactivity (scale-to-zero), so a bursty side project can cost just a few dollars a month. Firebase Blaze is usage-based with a generous free allocation, so a small app often pays $1 to $10 a month. For an idle or bursty project, Neon or Firebase can be cheaper than Supabase's flat $25; for a steady always-on workload, Supabase's flat fee becomes predictable and competitive. All verified May 2026.

Does Neon really scale to zero and save money?

Yes. Neon auto-suspends compute after a few minutes of inactivity, so a database that sits idle between requests stops billing for compute during that idle time, while storage continues at a low per-GB rate. For a side project or internal tool that gets occasional traffic, this can drop the monthly cost to a few dollars because you only pay for compute while queries actually run. The tradeoff is a brief cold-start delay when the database wakes. Supabase compute runs continuously on the Pro plan, so it does not benefit from idle savings the way Neon does.

Can Firebase Blaze produce a surprise bill?

Yes, and it is the main risk. Firebase Blaze is pay-as-you-go with no hard spending cap by default, so if your app goes viral or a coding bug causes a runaway loop of Firestore reads, the bill can spike to hundreds or thousands of dollars in a day. Firestore charges around $0.18 per 100,000 reads, which is cheap per operation but unbounded in aggregate. You should set up budget alerts and, where possible, usage limits before going to production. Supabase's flat Pro fee and Neon's metered-but-suspendable model both make a runaway bill less likely than uncapped Blaze.