Launched a free, lightning-fast UK fee calculator on Cloudflare Pages

As an active UK reseller flipping sportswear on eBay and Vinted, I was tired of using clunky spreadsheets to calculate my exact net margins. Between eBay's new zero-fee updates for private sellers, Vinted's buyer protection fees, and StockX's varying tiers, doing the math manually was becoming a massive headache.

So, I built a lightweight, static calculator using Tailwind and Vanilla JS, hosted on Cloudflare Pages for instant loading. It calculates take-home profit across all the major UK platforms side-by-side.

It’s completely free—you can check it out at https://resellerfees.co.uk. Would love any feedback from fellow e-commerce devs or resellers!