I built a Chrome extension to calculate Amazon product profit faster (looking for feedback)
Hi everyone,
I recently built a small Chrome extension called Marginix.
It helps Amazon sellers quickly calculate profit, ROI, margin and break-even price while analyzing products.
The idea came from constantly switching between Amazon, spreadsheets and FBA calculators while researching products, which was slowing everything down.
With this tool, I wanted to simplify that process into a single step.
I'm currently looking for feedback from other builders and Amazon sellers.
How do you usually calculate product profitability when analyzing products?
Do you rely on spreadsheets or any specific tools?
Nice niche and clear use case. I’d suggest showing one “before vs after” profit-calculation workflow in 30 seconds (manual spreadsheet vs extension) and adding a visible accuracy note on fee assumptions. That usually reduces skepticism fast. If useful, I can share a brief page/UX teardown: https://roastmysite.io/go.php?src=ih_marginix_20260327_a2
ı am waıtıng feedback.