A “forever free, serverless SQL database” is not unlimited or resource-free. “Serverless” describes how a provider allocates, suspends, or bills for compute; “free” applies only within a named plan’s current allowances and rules. Cloudflare says its Workers Free plan will “always include the ability to prototype and experiment with D1 for free”—a promise specifically about prototyping and experimentation, not unlimited capacity or every production workload.
What “serverless” changes about a database
A conventional database may keep computing capacity allocated while traffic is quiet. A serverless design can instead suspend eligible compute during inactivity or charge according to work performed. Either way, durable data still occupies storage, and queries still consume resources. The physical work does not disappear; the provider changes how it allocates and measures it.
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Cloudflare’s D1 pricing documentation describes one usage-based model: it measures reads and writes in rows, charges for storage above plan allowances, and says there is no charge for compute hours or capacity units while no queries are running. That is a description of D1’s billing, not a universal serverless formula.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Neon documents a different approach. Its scale-to-zero feature suspends eligible compute after five minutes without activity and starts it again when queried. Neon says reactivation takes a few hundred milliseconds; that is the provider’s documented behavior, not an independently measured latency guarantee. The feature applies to computes up to 16 CU; larger computes remain active.
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Is a free database really free forever?
Only in the limited sense that a provider may keep a particular plan available without a recurring charge under its stated terms. “Forever free” does not mean unlimited queries, storage, or compute, and it does not guarantee that a given application will stay within the free allowance as usage grows. Plan terms can also change, so check the provider’s current documentation before depending on a quota.
Cloudflare’s FAQ promise is expressly about the Workers Free plan’s ability to prototype and experiment with D1. The documented limits still apply, and exhausting a quota can block queries or writes rather than causing the service to absorb unlimited demand.
What the documented free limits cover
The figures below are provider-published plan limits, not industry averages. They measure different things, so a larger number in one row does not mean that service is more generous overall.
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|---|---|---|
| Cloudflare D1, pricing documentation last updated April 21, 2026 | 5 million rows read per day; 100,000 rows written per day; 5 GB total account storage | Maximum database size is 500 MB on Free. The same documentation lists a 10 GB maximum database size on Workers Paid. |
| Neon, free-plan FAQ published approximately four months before the October 7, 2026 crawl | 100 projects; 10 branches per project; 100 CU-hours per project per month; 0.5 GB storage per project; 5 GB public network transfer per project per month | These are separate per-project quotas where stated. Check the current plan terms because limits can change. |
| Supabase, billing page crawled October 6, 2026 | 500 MB database size per project; 5 GB egress | The billing page describes each project as a dedicated Postgres instance/server and says compute is charged independently of database usage. |
These limits are not directly interchangeable: D1 specifies daily row counts and account storage, Neon specifies monthly compute-hours and per-project allowances, and Supabase lists database size and egress alongside separately billed compute.
How the services differ in practice
Cloudflare D1: SQLite semantics inside Workers
D1 is a natural candidate when an application already runs on Workers and suits SQLite semantics. Its billing is tied to rows read and written, with storage limits. The Workers Free allowance includes daily read and write caps, while the documented maximum size of an individual Free database is 500 MB. At quota exhaustion, use can be interrupted; this is not an unlimited database that quietly scales past its free boundary.
Neon: PostgreSQL with eligible compute that can sleep
Neon offers managed PostgreSQL and documents scale-to-zero for computes up to 16 CU after five idle minutes. That can reduce idle compute use, but an application may encounter wake-up latency when traffic returns. The free plan also has monthly compute-hour, storage, and transfer allowances, so “scale to zero” does not remove all usage limits.
Supabase: Postgres as part of an integrated platform
Supabase is relevant when its broader backend platform matters, but the cited billing page is not an example of compute being free whenever the database is idle. It describes a dedicated instance/server per project and compute charges independent of database usage. Its Free plan has database-size and egress limits.
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What happens when a free quota runs out?
Do not assume that every provider handles exhaustion the same way. Cloudflare’s D1 FAQ and limits information indicate that reaching a quota can block queries or writes. Neon and Supabase have distinct quota and billing models; the cited plan information does not establish a single shared exhaustion behavior for them. Before relying on a free tier, check the provider’s current rules for the specific limit your workload is most likely to hit.
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- Estimate the resource your application consumes: reads, writes, storage, compute time, or network transfer.
- Track usage against the relevant daily or monthly boundary rather than treating “free” as a single pool.
- Decide what the application should do if a request fails or usage reaches its cap.
- Confirm what an upgrade would change, and whether it would add recurring compute costs.
How to choose without mistaking free limits for fit
Start with application compatibility, then examine the billing and operational behavior. D1’s SQLite semantics and Workers integration differ from Neon’s PostgreSQL interface and suspend-on-idle compute. Supabase’s dedicated per-project compute is another model, despite its free database and egress allowances.
- SQL compatibility: Check whether your application expects SQLite or PostgreSQL behavior; “SQL database” does not mean every service is a drop-in replacement.
- Idle behavior: Determine whether compute suspends, is billed by query work, or remains allocated per project. Consider whether wake-up time matters to your application.
- Quota shape: Compare the limits your workload actually uses, including storage, reads and writes, compute hours, and network transfer.
- Application integration: Account for where your code runs and which platform services it relies on.
- Production requirements: Free-tier figures alone do not establish service-level guarantees, backup and recovery protections, or sustained performance. The cited plan information does not provide a basis for comparing those factors.
A free serverless database can be useful for experiments and workloads that fit its specific plan. Whether it remains appropriate as a production application grows depends on compatibility, quota behavior, wake-up effects, and the provider’s current terms—not on the words “free” or “serverless” alone.
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