General-Purpose
Sync for the Web
Gigabugs – Our 1.2 million row issue tracker.
Sync engines enable instant UX by downloading data to the client ahead of time. Reads and writes happen locally, and changes are synced in the background.
It's a beautiful idea, and one that has been used by some of the world's best software: Linear, Figma, Superhuman, and Dropbox were all built this way.
But there's a catch. And this catch is the reason why sync-based apps are still rare.
Apps usually have far too much data to download up-front. They also have complex permissions. Incrementally syncing a static block of data is easy; syncing just the slice the user wants and has access to is much more difficult.
We created Zero to solve these problems in a general way, and to bring the performance of sync to the entire web.
How It Works
Zero has two parts: zero-client and zero-cache.
Zero-cache runs in the cloud and maintains a read-only replica of your Postgres database. Zero-client gets linked into your app and maintains a client-side store of recently used rows.
Queries run against the client first, returning matching results instantly. In parallel, queries are sent to the server, which returns authoritative results asynchronously.
Server results are automatically stored client-side, so that future queries can be answered instantly.
import {queries} from 'queries.ts'
import {mutators} from 'mutators.ts'
function Playlist({id}: {id: string}) {
// This usually resolves *instantly*, and updates reactively
// as server data changes. Just wire it directly to your UI –
// no HTTP APIs, no state management, no realtime goop.
const [playlist] = useQuery(
queries.playlist.byID({id})
)
const onStar = (id: string, starred: boolean) => {
mutators.playlist.star({id, starred})
}
// render playlist...
}Efficient incremental execution of complex queries is made possible by ZQL, a new streaming query engine we built specifically for Zero.
This architecture lets you sync exactly the data you need, when you need it — enabling instant UI without preloading the universe.
Features
From Our Users
As a general sync engine, Zero lets us change our data model without touching infrastructure.
Zero makes apps really fast, but also simplifies their code. It's a wonderful abstraction for our engineers and their AI agents.
Zero is a game changer. You will be shocked at how fast it is.
Have been building with Zero for months. It's making me hate my older codebases.
We rebuilt Productlane from the ground up to make the fastest customer support tool out there. Huge shoutout to Zero for making this possible!
One of my favorite features is custom mutators. I can run validation logic instantly on the client for fast UX, and optionally do additional validation on the server for security or performance.
Rocicorp is making something that used to require an insane amount of engineering in-house. Hard to go back once you've used it.
Ranger now runs faster than any of our competitors thanks to Zero.
Deployed it halfway across the world and literally can't tell.
Built a notes app yesterday and Zero blew my mind. Excited to see SaaS verticals finally get some good web apps.
Zero is open-source and fully self-hostable.
We also offer a fully-managed service, which can run on either your servers or ours.
Runs in Rocicorp's AWS account
Hobby
- 10 GB storage
- 3 shared vCPU
- Support via public Discord
- Best-effort monitoring
- Additional storage: $0.20/GB
Professional
- 100 GB storage
- 7 dedicated vCPU
- Shared Slack channel
- 24/7 monitoring + SLA
- Additional storage: $0.20/GB
- Additional vCPU: $50
Runs in your AWS account
Bring Your Own Cloud
- Data stays in your AWS account
- Rocicorp has limited privileges
- Shared Slack channel
- 24/7 monitoring + SLA
- Includes 10 vCPU
- Additional vCPU: $20
Now Onboarding
Answer a few questions about your project and we'll get you running on Cloud Zero today.