ZS
Zero Sync
Zero is a software solution designed to enable developers to build web applications with instant user interfaces by leveraging a sync-based architecture.
Our verdict
Who it's for
Build absurdly fast web applications with instant queries and reactive UI by default.
Who should look elsewhere
Requires a Postgres database.
Pros
- +Significantly improves web application performance and user experience.
- +Simplifies data synchronization and state management for developers.
- +Provides full control over business logic and permissions on the server.
- +Open-source and self-hostable for flexibility.
- +Compatible with existing Postgres setups.
Cons
- −Requires a Postgres database.
- −Managed service pricing can increase with additional storage and vCPUs.
- −Limited privileges for Rocicorp in BYOC model.
Key features
- ✓Instant Reads (client-first queries)
- ✓Instant Writes (client-first mutations with automatic revert handling)
- ✓Automatic Reactivity (updates when server data changes, even from non-Zero clients)
- ✓Fast Startup (query-driven sync for precise data loading)
- ✓Server Authority (all reads/writes flow through your server for control)
- ✓Easy Integration (works with normal Postgres databases, schemas, APIs)
- ✓ZQL streaming query engine
Pricing
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Open-source | — | month | Fully self-hostable |
| Hobby | $30 | month | 10 GB storage; 3 shared vCPU; Support via public Discord |
| Professional | $300 | month | 100 GB storage; 6 dedicated vCPU; Shared Slack channel |
| BYOC | $1000 | month | Runs in your AWS account; Data stays in your AWS account; Rocicorp has limited privileges |