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A “forever free, serverless SQL database” is free only within a named plan’s current limits and allowed use. “Serverless” describes how the provider allocates, suspends, or bills for compute; it does not make storage or query work costless. Cloudflare, for example, says its Workers Free plan will always let users prototype and experiment with D1 for free—but D1 still has read, write, and storage caps, and reaching a limit can block queries or writes.
What “serverless” changes—and what it does not
A conventional database deployment may keep compute resources allocated even when application traffic is low. A serverless service can instead suspend eligible compute while idle or meter activity according to the work performed. Durable data still needs storage, and queries still consume resources.
Cloudflare’s D1 pricing documentation describes a usage-based model: it measures rows read and written and charges for storage above included plan limits. It says there is no charge for compute hours or capacity units while no queries are running. That is one provider’s billing model, not a formula shared by every serverless database.
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Neon documents a different approach for eligible PostgreSQL compute: after five minutes without activity, it suspends the compute and automatically reactivates it when queried. Neon says reactivation occurs within a few hundred milliseconds; that is a vendor-published statement, not an independently measured latency guarantee. The feature applies only to computes up to 16 CU; larger computes remain active.
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In both examples, compute lifecycle and durable database state are handled separately enough to make idle compute cheaper or temporary. The services’ documentation does not establish that they use the same internal architecture. The trade-offs to examine are usage caps, possible wake-up delay, SQL compatibility, and how the database fits the rest of an application.
What “forever free” actually promises
“Forever free” is a statement about a plan’s terms, not a promise of unlimited capacity, unchanged limits, or a permanently free bill for any workload. Cloudflare’s wording is specifically: “Yes, the Workers Free plan will always include the ability to prototype and experiment with D1 for free.” The promise is limited to prototyping and experimentation; D1’s documented usage and size limits still apply.
A free tier can be useful for learning, prototypes, and workloads that stay within its allowance. Before relying on it for an application, check the plan’s permitted use, what counts toward each quota, what happens at the limit, and whether the workload’s growth or availability needs fit the service. A free tier by itself does not establish production suitability.
How the documented free plans differ
The figures below are provider-published plan details, not industry averages. Limits and terms can change. Cloudflare’s D1 pricing and size figures below come from documentation last updated April 21, 2026. Neon’s free-plan figures were listed in an FAQ published approximately four months before an October 7, 2026 crawl. Supabase’s figures reflect its billing page as crawled October 6, 2026.
| Service | Database and compute model | Documented free allowances | Important distinction |
|---|---|---|---|
| Cloudflare D1 | SQLite semantics integrated with Workers; usage is measured by rows read and written. No charge for compute hours or capacity units while no queries are running, according to Cloudflare’s pricing documentation. | Workers Free: 5 million rows read per day, 100,000 rows written per day, and 5 GB total account storage. Maximum database size: 500 MB on Free; 10 GB on Workers Paid. | There are daily read/write caps, a 5 GB account storage allowance, and a per-database size cap. Cloudflare documents the free plan’s D1 promise for prototyping and experimentation. |
| Neon | Managed PostgreSQL. Eligible compute suspends after five idle minutes and resumes when queried; computes above 16 CU do not scale to zero. | Free plan: 100 projects, 10 branches per project, 100 CU-hours per project per month, 0.5 GB storage per project, and 5 GB public network transfer per project per month. | Compute-hour and storage quotas apply. The stated wake-up timing is vendor documentation, not a measured result. |
| Supabase | Managed Postgres within an integrated backend platform. Its billing page describes each project as a dedicated Postgres instance/server and compute as independent of database usage. | Free plan: 500 MB database size per project and 5 GB egress. | This is not an example of compute being free whenever there are no queries: the cited billing page says compute is charged independently of database usage. |
The allowance figures above are not directly interchangeable. D1 counts daily row reads and writes, Neon lists monthly compute-hours and per-project storage and transfer, and Supabase lists project database size and egress. Compare the units with your workload rather than ranking services by the largest-looking number.
What happens when a free database reaches its limit?
Do not assume the service will quietly absorb excess traffic or that every provider responds the same way. Cloudflare’s D1 FAQ and limits information say quota exhaustion can block queries or writes. That can interrupt an application until usage falls within the allowance or the account moves to a suitable plan. The cited material does not establish a universal exhaustion behavior for Neon or Supabase, so check their current plan documentation before depending on a particular response.
For D1, the difference between the account storage allowance and a database’s maximum size matters: the Free plan lists 5 GB total account storage, while an individual Free database is capped at 500 MB. A project can therefore run into a per-database limit before using all account-level storage.
How to choose for an actual application
Start with how your application works, not the word “free.” These services differ in SQL model, compute behavior, quota units, and runtime integration.
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- Check SQL compatibility. D1 uses SQLite semantics and integrates with Workers. Neon and Supabase offer PostgreSQL. Confirm that your application’s queries and database features fit the target engine.
- Map the workload to the meter. Estimate row reads and writes for D1, compute-hours and transfer for Neon, or database size and egress for Supabase. Use the provider’s definitions for what counts; the headline allowance alone may not predict usage.
- Account for idle and wake-up behavior. D1’s pricing says idle periods with no running queries incur no compute-hour or capacity-unit charge. Neon documents a five-minute idle-to-suspend period for eligible compute and a reactivation delay. Supabase’s cited billing description instead ties compute charges to the project independently of database usage.
- Plan for quota exhaustion. Identify whether reaching a cap blocks reads, writes, or both, and what action restores service. D1 documents that quota exhaustion can block queries or writes; verify the current behavior for any other provider you consider.
- Check the application integration. D1 is a natural fit to evaluate when the application already runs on Workers and suits SQLite. Neon is relevant when PostgreSQL and eligible scale-to-zero compute fit. Supabase is relevant when its integrated backend platform is useful, while its compute billing should be considered separately from database activity.
- Verify production requirements separately. The plan figures and architecture descriptions here do not establish comparative service-level agreements, backup or recovery guarantees, or sustained performance. Review the provider’s current terms and operational documentation against the needs of your application.
When a free tier is a good fit
A free plan can be a sensible starting point when the workload is small or experimental, its resource use is predictable, and any interruption at a quota boundary is acceptable. It is a weaker basis for a production commitment when demand may outgrow hard caps, when cold-start behavior matters, or when availability and recovery requirements have not been checked.
Recheck provider plan pages before deployment: the dated figures above describe the cited documentation at the dates given, not a guarantee that the terms remain unchanged.
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