Free and open-source software

Check the offer, not the sales pitch.

Enter a gold item's weight, karat and the amount a buyer offered. The checker compares the net offer with the live metal value and four clear payout benchmarks.

TransparentThe calculation engine is dependency-free and covered by tests.

Private by defaultYour weight and offer stay in the browser. There is no lead form or account.

Metal onlyStones, collectability, workmanship and buyer trust are deliberately outside the model.

ReusableUse the pure JavaScript function or drop the web component into another page.