Zero (Rocicorp)

Postgres sync engine for local-first

Free tier + paidDatabases & backendzero.rocicorp.dev

What it is

A general-purpose sync engine that keeps a queryable client-side replica in sync with an ordinary Postgres database, so UI reads are instant and offline works by default. It reached a stable 1.0 in June 2026. Runs as zero-cache alongside your own API servers.

Why it earns a slot

Gets you the instant, no-spinner feel of Linear without hand-writing cache invalidation, and it sits on plain Postgres you already own. Used in production by tldraw, Tines and Productlane.

Know before you commit

Not a managed backend — you still need Postgres with logical replication, a zero-cache server and your own API endpoints. The cheapest hosted tier is $30/mo, and this is the most operationally demanding option on this list.

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Pricing snapshot

Open source and self-hostable for free. Cloud Zero: Hobby $30/mo, Professional $300/mo, BYOC from $1,000/mo plus your own AWS costs.

Snapshots move fast — verify at checkout, and post a field note if it changed.

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Evaluate Zero (Rocicorp) (https://zero.rocicorp.dev) for this project, then use it only if it fits what we are already building.
Context: Postgres sync engine for local-first. A general-purpose sync engine that keeps a queryable client-side replica in sync with an ordinary Postgres database, so UI reads are instant and offline works by default. It reached a stable 1.0 in June 2026. Runs as zero-cache alongside your own API servers.
Reviewer notes (general, not written for this codebase): Gets you the instant, no-spinner feel of Linear without hand-writing cache invalidation, and it sits on plain Postgres you already own. Used in production by tldraw, Tines and Productlane.
Watch out for: Not a managed backend — you still need Postgres with logical replication, a zero-cache server and your own API endpoints. The cheapest hosted tier is $30/mo, and this is the most operationally demanding option on this list.
Pricing: Open source and self-hostable for free. Cloud Zero: Hobby $30/mo, Professional $300/mo, BYOC from $1,000/mo plus your own AWS costs.
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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Named in the wiringtldraw

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