StateWise

Track US sales tax nexus across every channel you sell on. Most states count Amazon sales too. Your admin counts only what flows through it. If you also sell on Amazon, Etsy or eBay, most US states count those toward the threshold that forces you to register. StateWise imports your marketplace exports alongside your store orders and measures them against each state's own rule: threshold, transaction test, window, and whether marketplace sales count. You get a map, crossing dates, the math behind each number, and a CPA export. StateWise does not file, remit, or calculate checkout tax.

This app's listing is still live, but it recently dropped out of Shopify's App Store search index.