Real-time sync you actually own.
Voxell Lux serves reads straight from the browser — zero network round trips — and pushes every change across a user's devices over a live WebSocket. One ~2.5 KB client, no build step, no backend to stand up, and no per-operation meter on your bill. You run it on your own cloud account; your data stays in your account.
Own your data. Predictable cost. Local-first speed.
Managed sync services run on the vendor's infrastructure and meter you per operation — every read, write, and real-time delivery is a line item, and the bill climbs with fan-out. Voxell Lux runs as a single process on infrastructure you control: real-time delivery is included, the cost is flat, and the data never leaves your account.
Self-host, no lock-in
Deploy on your own cloud account (GCP or AWS Marketplace), backed by your own durable store. No proprietary runtime, no data leaving your account, no vendor you can't leave.
Real-time delivery included
Delivery isn't metered per message, so your bill doesn't balloon with fan-out the way per-operation pricing does. One process, flat and predictable as you grow.
Zero round trips, live push
Reads are served from the browser synchronously — no network in the hot path, online or off. Every change pushes across a user's tabs and devices over a live WebSocket the instant it happens. A ~2.5 KB client, no build step.
Under the Hood: High-Performance State Broker
Voxell Lux bypasses the overhead of traditional enterprise message queue layers. We've optimized the sync engine for extreme microsecond dispatch directly in host memory.
Zero-Plumbing Memory Pipes
By eliminating heavy ActiveMQ, RabbitMQ, or Kafka plumbing, the Go-based broker operates entirely in host memory. Real-time synchronization functions as a clean, lock-free asynchronous pipe that relays diffs directly over optimized persistent WebSockets with near-zero memory footprint.
35 ns/op "C Buckets" Limiter
Patent-Pending Lock-Free Token Layer
Protecting resources under extreme concurrency typically demands expensive database locks. Voxell Lux utilizes a patent-pending, hardware-optimized lock-free rate limiter running at 35 ns/op per bucket in host container memory.
Atomic LWW-Reconciliation
Rather than transferring full database objects or whole state trees on every small modification, the client-side module performs active delta value diffing. The backend synchronizes states using atomic logical timestamps to guarantee LWW (Last-Write-Wins) precision with minimal database overhead.
Drop-in State Synchronizer
Add cross-device synchronization to any existing static HTML file, serverless application, or classic script. No build steps, no webpack configurations, and no complex schemas.
- Last-write-wins reconciliation resolved by atomic server-side timestamps.
-
Flush on demand — call
store.flush()onpagehideto push pending saves before a tab closes. - Secure credentials validated dynamically on Cloud Run against Firestore registration records.
import { featherweight } from 'https://cdn.jsdelivr.net/npm/@voxell/featherweight/src/featherweight.js';
// Initialize state store
const store = featherweight('user-preferences', {
endpoint: 'https://api.voxell.ai/featherweight',
apiKey: 'fw_demo_xxxxxxxxxxxx',
realtime: true
});
// Load local-first state, then update when push sync lands
store.load((data, meta) => {
console.log(`Synced! [Source: ${meta.source}]`, data);
updatePreferencesUI(data);
});
// Save updates synchronously to local cache & debounce to Cloud Sync
saveButton.onclick = () => {
store.save({ theme: 'dark', fontSize: 16 });
};Is Voxell Lux a fit?
We're not for everyone, and we'd rather tell you up front than waste your assessment.
Great fit if you want to…
- • Self-host and keep your data in your own cloud account
- • Keep cost flat and predictable as real-time fan-out grows
- • Avoid lock-in to a single vendor's proprietary stack
- • Add fast, local-first cross-device state with a drop-in client
Probably not, if you…
- • Require a fully-managed, first-party service you never operate
- • Are committed to one vendor's native ecosystem end to end
- • Need a turnkey suite of auth, functions, and analytics in one bill
Available through your cloud marketplace
Procure and deploy through the cloud you already run on. No public pricing — licensing is scoped with our team.
Google Cloud Marketplace
Deploy through your Google Cloud account, on the Cloud Run + Firestore stack Voxell Lux is built for. Licensing is handled directly with our team.
AWS Marketplace
Coming to AWS Marketplace for procurement against your existing AWS account. Talk to us about early licensing.
References to other services describe their general architecture and billing model as of June 2026; verify current terms with the respective provider. Performance figures are measured on Voxell's reference hardware and will vary by deployment.