The latest articles on DEV Community by Douglas Correa (@douglascorrea). https://dev.to/douglascorrea https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F18518%2F6f5510ad-87c7-45c0-90e8-4dfc299d19a6.jpg https://dev.to/douglascorrea en Douglas Correa Thu, 19 Mar 2026 14:27:46 +0000 https://dev.to/douglascorrea/i-built-a-local-first-net-worth-tracker-that-never-touches-a-server-1ia5 https://dev.to/douglascorrea/i-built-a-local-first-net-worth-tracker-that-never-touches-a-server-1ia5 <p>Every finance app I tried wanted my bank login. Mint, Monarch, Copilot, they all connect through Plaid or similar services. I just wanted to track my net worth over time without giving a third party access to my accounts.</p> <p>So I built <a href="https://vaultedworth.com" rel="noopener noreferrer">Vaulted</a>.</p> <h2> What it is </h2> <p>A free, open-source net worth tracker that runs entirely in your browser. No account, no server, no cloud database.</p> <p>You add your assets and liabilities manually, and Vaulted shows you:</p> <ul> <li>Your total net worth</li> <li>Asset breakdown (donut chart)</li> <li>Net worth trend over time (monthly snapshots)</li> <li>Multi-currency support (USD, EUR, GBP, BRL, etc.)</li> </ul> <h2> The tech </h2> <ul> <li> <strong>Next.js 16</strong> with static export (deployed on GitHub Pages)</li> <li> <strong>IndexedDB</strong> as primary storage with localStorage fallback</li> <li> <strong>TypeScript</strong> throughout</li> <li> <strong>Tailwind CSS</strong> for styling</li> <li> <strong>Recharts</strong> for the charts</li> <li> <strong>PWA</strong> with service worker for offline support</li> </ul> <p>The entire app is a static site. No API routes, no server functions. The build output is plain HTML/CSS/JS served from GitHub Pages.</p> <h2> Storage approach </h2> <p>I went with IndexedDB as the primary store because it's more durable than localStorage. Most browsers don't wipe IndexedDB when you "clear cookies." There's also a localStorage fallback for older browsers.</p> <p>Data is saved on every change. There's a JSON export/import for backups, and the app shows a reminder banner when you haven't backed up in a while (since your data only exists on your device).</p> <h2> The trade-off </h2> <p>No automatic bank sync. You update your numbers yourself. For net worth tracking, most people do this monthly. Takes about 2 minutes.</p> <p>The upside: nobody can leak your financial data because nobody has it. No breach risk, no third-party access, no data selling.</p> <h2> Try it </h2> <ul> <li>Live: <a href="https://vaultedworth.com" rel="noopener noreferrer">vaultedworth.com</a> </li> <li>Source: <a href="https://github.com/douglascorrea/vaulted" rel="noopener noreferrer">github.com/douglascorrea/vaulted</a> </li> </ul> <p>It's free, no sign-up, works offline once loaded. Feedback welcome.</p> nextjs opensource privacy showdev