FitCheck: Privacy-First Size Recommendations
An open-source Chrome extension that analyses size guides on fashion sites and tells you exactly what to buy — with zero data leaving your device.
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Clothing sizes are wildly inconsistent across brands — a medium at one retailer is a large at another. FitCheck solves this by scraping the size guide on every product page you visit, comparing it against your body measurements, and recommending the size that actually fits.
Zero Data Leaves Your Device
Every measurement and every size calculation happens locally in the browser using the Chrome Storage API. There are no servers, no analytics, and no tracking — the extension makes zero network requests of its own. Fully open source, so anyone can audit the code.
Smart Fit Scoring
Built a per-measurement fit-scoring algorithm that ranks each available size and returns a confidence percentage, flagging areas that might run tight or loose so the user can make an informed call — not just a blind pick.
Multi-Site Support
Shipped with parsers for ASOS, Zara, Boohoo, PrettyLittleThing, and H&M — each with their own bespoke size-guide DOM structures. Designed for community contribution: adding a new retailer is a single-file change with a handful of selectors.
Built on Manifest V3
Vanilla JavaScript and a Manifest V3 service worker keep the footprint minimal — no framework bloat, no build pipeline required to audit. A GitHub Pages landing page and automated release workflow make distribution frictionless.