DEV3 Discount and Sale Price Calculator — Source Code (React + Tailwind)

Source code of the DEV3 Discount and Sale Price Calculator, a sale price calculator for single, stacked and buy-X-get-Y discounts, with reverse calculation back to the original price.

Download: buy a licence and the ZIP is waiting in Account → Downloads. Try it live: https://dev3.tech/tools/discount-sale-price-calculator shows the finished tool running.

What is in the download

• A standalone Vite + React + TypeScript + Tailwind CSS project: src/tool holds the tool, shared pieces sit beside it
• package.json with exact versions plus a lockfile, so npm ci works
• README.md (run, build, embed in Next.js or plain React) and an MIT LICENSE

What the code does

• Stacked discounts applied in sequence with step-by-step prices
• Buy X get Y free with an optional extra coupon
• Sales tax on the discounted price
• Reverse: original price and discount percent from a sale price

Tech stack

React 19, TypeScript, Vite, Tailwind CSS 4.

Install and customise

The How to install and How to use tabs list the steps. In short: unzip, npm ci, npm run dev, then copy the tool folder into your own app if you want to embed it.

Good to know

• A browser-only tool: there is no backend or database in the code.