Answers, not dashboards.
WidenMargin is a set of free tools for Amazon US sellers. Each one answers a single question — what does this product really make, where did my payout go, did Amazon pay for what it lost — from your own numbers or your own Seller Central reports.
How the tools work
- Free, no login. No account, no card, no Seller Central access. Open the page and use it.
- Your files stay on your device. Reports are read by your own browser; nothing from them is uploaded or stored.
- No invented numbers.Fees and costs are yours to enter, because Amazon's vary by category, size and date. Every figure shown is arithmetic on your inputs, and the analyzers show how they read your file.
Start here
What it is not
Not a dashboard, not a guru, and not a claims service. The tools show what is worth checking; you decide what to do and file any case with Amazon yourself. They are not tax or legal advice.
Built by Vedant Agarwal. Feedback shapes what gets built next.
See all free toolsQuestions or a report that didn't read right? hello@widenmargin.com