Zero Sync
Claim this toolBuild absurdly fast web applications with instant queries and reactive UI by default.
From $30/mo (free plan available)Visit WebsiteFreemiumVisit Website
Tracked since2026
The Bottom Line
- Price
- From $30/mo (free plan available). Compare plans
Key facts
- Enables instant UI for web applications through client-side data syncing.
- Works with existing Postgres databases and provides reactive data updates.
- Offers both self-hosting and managed service options, including a free tier.
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.
What is 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. It addresses the challenges of traditional sync engines, which struggle with large datasets and complex permissions, by providing a general solution for syncing only the necessary data.
The product consists of two main components: zero-client and zero-cache. Zero-cache maintains a read-only replica of your Postgres database in the cloud, while zero-client creates a local store of recently used rows within your application. Queries are first executed against this client-side store for instant results, and then asynchronously sent to the server for authoritative data. Server results are subsequently cached client-side, ensuring future queries are also instant. This approach, powered by a new streaming query engine called ZQL, allows for precise control over data syncing, leading to fast startup times and highly reactive user experiences. It's ideal for developers looking to create highly performant web applications that feel instantaneous to the end-user, without the complexities of manual state management or real-time infrastructure.
Available on: Web
Preview
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 Plans
Pricing checked Sep 23, 2026
| Plan | Price | Details |
|---|---|---|
| Open-source | Free |
|
| Hobby | $30 / mo |
+2 moreShow less
|
| Professional | $300 / mo |
+2 moreShow less
|
| BYOC | $1000 / mo + AWS |
+4 moreShow less
|
Is Zero Sync worth the price?
Good value
Zero Sync's pricing is quite generous for developers, starting with a free open-source option.
The Hobby tier at $30/month offers good value for small projects, while the Professional tier at $300/month scales well for growing applications. The BYOC option at $1000/month + AWS costs is best for enterprises with strict data sovereignty and infrastructure control needs.
Hidden Costs & Gotchas
Additional storage at $0.20/GB adds up
How Zero Sync's pricing compares
At $30/mo, billing unit not specified, Zero Sync is the most premium of its 5 comparable direct competitors.
Entry paid plan, monthly. Pricing checked Sep 23, 2026.
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Zero Sync FAQ
How does Zero Sync enable instant queries in web applications?
Zero Sync achieves instant queries by first executing them against a local, client-side store of recently used data. This local store is populated by zero-client, which works in conjunction with zero-cache to provide a read-only replica of your Postgres database in the cloud.
Which teams would benefit most from using Zero Sync?
Teams focused on building highly performant web applications with reactive user interfaces will find Zero Sync most beneficial. It simplifies data synchronization and state management, allowing developers to create applications that feel instantaneous to the end-user.
How does Zero Sync compare to Firebase for data synchronization?
Zero Sync provides a general solution for syncing only necessary data, addressing challenges with large datasets and complex permissions that traditional sync engines might face. Unlike Firebase, Zero Sync is open-source and self-hostable, offering flexibility and compatibility with existing Postgres setups.
What kind of database is required to use Zero Sync?
Zero Sync requires a Postgres database to function. Its zero-cache component maintains a read-only replica of your Postgres database in the cloud, integrating directly with existing Postgres setups.
Does Zero Sync include a free tier?
Yes, Zero Sync is available on a free tier. Paid plans are offered for users who require more usage and additional features beyond what the free tier provides.
How does Zero Sync handle data synchronization with complex permissions?
Zero Sync addresses the challenges of complex permissions by providing a general solution for syncing only the necessary data. It allows for precise control over data syncing, ensuring that only relevant information is transferred and cached.
Can developers maintain control over their business logic with Zero Sync?
Yes, Zero Sync allows developers to maintain full control over their business logic and permissions on the server. This ensures that core application rules and data access remain within the developer's purview while still benefiting from the sync architecture.
Source: zero.rocicorp.dev