MarginPeek — Profit & Review Analyzer

Work out whether a product is actually worth selling, while you are looking at it. Enter your cost, shipping and fees, and MarginPeek calculates profit per unit, margin percentage, return on investment, the breakeven unit count, and the price you would need to charge to hit a 30% margin. The arithmetic is done in your browser. There is also an optional review summary. It is off unless you turn it on, and it uses your own OpenAI API key, which you enter in the extension's settings and which is stored locally. We do not supply a key and we do not proxy the request. For anyone doing product research on marketplaces who is tired of switching to a spreadsheet.