Quick answer
Supabase - Supabase is the wider free tier once you count auth, storage, and edge functions, though D1 gives more raw database storage.
How the free tiers compare
Cloudflare D1 keeps the offer narrow: a SQLite database with 5 GB of storage and daily read and write caps, nothing else bundled in. Supabase bundles a Postgres database with authentication for up to 50,000 monthly active users, file storage, edge functions, and realtime, all on the same free plan. Its database size is capped tighter, at 500 MB per project, and it caps you at 2 active projects that pause after a week of inactivity.
Cloudflare D1 vs Supabase free tier, side by side
| Cloudflare D1FTV 46 | SupabaseFTV 56 | |
|---|---|---|
| Database storage | 5 GB total | 500 MB per project |
| Rows read | 5 million per day | Not specified |
| Rows written | 100,000 per day | Not specified |
| Monthly active usersD1 has no built-in auth product. | Not specified | 50,000 |
| File storage | Not specified | 1 GB |
| Egress | Not specified | 5 GB, plus 5 GB cached egress |
| Function invocations | Not specified | 500,000 Edge Function calls |
After you outgrow the free tier
D1's paid tier is a flat $5 a month. Supabase's Pro plan starts at $25 a month and scales usage on top of that.
When to pick each one
Pick Cloudflare D1 when…
- You want more raw SQL storage headroom than Supabase's 500 MB project cap.
- You only need a database, not auth, storage, or functions bundled in.
- You are already inside the Cloudflare Workers ecosystem.
Pick Supabase when…
- You want a full backend in one free tier: database, auth, storage, and functions.
- You need built-in authentication for tens of thousands of users.
- You want realtime subscriptions and edge functions without adding another vendor.
Bottom line
D1 suits a project that only needs a plain database with generous storage. Supabase suits a project that wants the database, the auth, and the storage layer covered by one free plan.
Read the full listings: Cloudflare D1 and Supabase. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.