Overview

StashBridge syncs localStorage across your browsers and devices using a lightweight browser extension.

The Problem

Many web apps store preferences, favorites, and UI state in localStorage. Switch browsers (or clear data) and it’s all gone. There’s no built-in way to sync this across browsers.

How It Works

Browser Sync (Default — Zero Setup)

1. Install the extension and sign into your browser’s sync (Chrome Sync, Firefox Sync, Brave Sync)
2. Whitelist sites you want to sync
3. Changes are compressed and stored in the browser’s built-in synced storage
4. Other instances of the same browser pull changes automatically

No server needed. Works immediately.

Server Relay (Optional — Cross-Browser)

For syncing between different browsers (Chrome to Firefox), you can optionally connect a Cloudflare Worker relay:

1. Deploy a free Cloudflare Worker (5 minutes)
2. Enter the server URL and token in the extension settings
3. Changes sync across any browser via the relay

Features

• Browser Sync — zero-config default using your browser’s built-in sync
• Compression — LZ-String compression to fit more data in the 100KB sync limit
• Optional encryption — AES-256-GCM with a passphrase you set
• Storage usage indicator — see how much of the 100KB limit you’re using
• Server relay — optional Cloudflare Worker for cross-browser sync
• Whitelist control — only sync sites and keys you explicitly choose

Use Cases

• Sync favorited plugins on Obsidian Stats
• Keep Hacker News upvoted/hidden stories across browsers
• Sync preferences for dev tools (Swagger UI, GraphQL Playground)
• Persist layout preferences for self-hosted dashboards

What You Need

• A Chromium browser (Chrome, Edge, Brave) or Firefox
• That’s it for browser sync mode
• A free Cloudflare account only if you want cross-browser sync

Cost

Component	Cost
Extension	$0
Browser Sync	$0 (built into your browser)
Server Relay (optional)	$0/month (Cloudflare free tier)
Total	$0/month