Profit-Leak Detector is a free Amazon Sponsored Products analyzer built by Lynx Media. Upload your search-term report and the tool flags exactly which SKUs are bleeding margin — through high TACOS, wasted ad spend on near-zero converters, and keywords that look fine on ACOS but lose money once you bake in COGS and fees.
Built for $1M+ FBA brands who already know ACOS is a vanity metric and want to operate to blended profit. No login, no email gate, no data stored — your report stays in your browser.
Genuinely free, no email gate. The catch is that we publish free tools to demonstrate the kind of operating discipline we apply at Lynx Media. If you want our team to run the audit + 90-day fix plan, that's our paid service.
No. The CSV is parsed and analyzed locally with JavaScript. We don't upload your report to a server; we don't log the contents.
ACOS only tells you spend / ad revenue. It doesn't bake in COGS, FBA fees, returns, or referral fees. A 20% ACOS can still lose money on a thin-margin SKU. This tool computes true profit per impression-served, which is the metric that determines whether the SKU is worth advertising at all.
Tested up to ~150,000 rows (about a 90-day report for a mid-six-figure brand). Modern browsers handle that comfortably; older devices may chug on the biggest reports.
Three plays: (1) add the worst search terms as negative keywords, (2) restructure the campaigns hosting those terms by intent, (3) review SKU-level COGS for the leakiest items. Our blog post has the full playbook.