Vaultrice – A real-time key-value store with a localStorage API
Hi HN, I'm Adriano, one of the makers of Vaultrice. I'm excited (and a little nervous!) to share what we've been building. For years, we found ourselves in a frustrating loop: whenever we needed a simple real-time feature—like a "who's online" list, a collaborative app, or just sharing state between a marketing site and our main app — we'd end up spending days setting up the same stack or discarded to do it. Setting it up, it always involved wiring together a database, a WebSocket server, an API, and managing the connection state. It felt like massive overkill for what we were trying to…
In plain words
Vaultrice is a real-time key-value store that uses a localStorage-style API for developers building features like "who's online" lists and collaborative applications. Built on Cloudflare's Durable Objects, it simplifies real-time data syncing across domains and devices without requiring developers to manually set up databases, WebSocket servers, and APIs. The service handles state management and security automatically, targeting developers who need quick real-time functionality without infrastructure complexity.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN, I'm Adriano, one of the makers of Vaultrice. I'm excited (and a little nervous!) to share what we've been building. For years, we found ourselves in a frustrating loop: whenever we needed a simple real-time feature—like a "who's online" list, a collaborative app, or just sharing state between a marketing site and our main app — we'd end up spending days setting up the same stack or discarded to do it. Setting it up, it always involved wiring together a database, a WebSocket server, an API, and managing the connection state. It felt like massive overkill for what we were trying to achieve. We wanted a tool that felt as simple to use as the browser's `localStorage` API but worked across domains and devices, with real-time sync and security built-in. So, we built Vaultrice. It’s a key-value data store built on top of Cloudflare's Durable Objects, which gives you a strongly consistent backend for each data object. You interact with it through our TS/JS SDK, which comes in two flavors: 1. `NonLocalStorage`: A low-level client with a `localStorage`-like API (`setItem`, `getItem`, etc.) plus real-time events and presence (`.on()`, `.join()`). 2. `SyncObject`: A higher-level, reactive JavaScript Proxy. You just change a property on an object (`doc.title = 'New Title'`), and it automatically syncs to all other connected clients. The goal is to let you build the real-time features you want in minutes, not days. We've also put a lot of thought into a layered security model, allowing you to go from simple API key restrictions all the way to server-signed object IDs and client-side E2EE. We’ve just launched and would be grateful for any feedback from the HN community. What do you think of the API design? Are there use cases we haven't considered? Any thoughts on the security model? We'll be here (or via email ([email protected])) to answer any questions. Thanks for checking it out!
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