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See estimated sales, BSR, FBA profit and listing quality right on Amazon search and product pages. 19 markets, plus Walmart & Etsy. Seller Niche puts the research layer on the Amazon page you are already looking at. No tab switching, no CSV exports, no copying ASINs into another tool. ON A SEARCH RESULTS PAGE An X-Ray row appears under every result: price, BSR, estimated monthly sales, estimated monthly revenue, review count and rating. Track any ASIN to your dashboard in one click. ON A PRODUCT PAGE COSMO Score — a floating badge that scores the listing 0–100 on the seven signals Amazon's Rufus layer reads: title quality (20), bullet points (20), A+ content and description (15), images and video (15), reviews and rating (15), Q&A (5), keyword integration (10). Hover it for the per-criterion breakdown and what to fix. FBA Profit Estimate — added straight to the buy box: sell price, 15% referral fee, tiered FBA fulfilment fee, a 25% COGS placeholder, then net profit, margin and ROI. Sidebar with four tabs — Overview (price, BSR, estimated sales, revenue, reviews, rating, Niche Score, COSMO Score), Listing (a 10-point quality checklist), Keywords (phrases extracted from the title, bullets, description and meta tags), Profit (recalculate with your own cost and fee figures). 30-day price and BSR history, drawn as sparklines. 19 AMAZON MARKETPLACES US, UK, DE, FR, IT, ES, TR, CA, AU, JP, IN, MX, BR, NL, SE, PL, SG, SA, AE. WALMART AND ETSY On a Walmart item page or an Etsy listing you get a floating profit estimate built on that marketplace's own fee structure. Figures are read from the page's own structured data; when a page does not expose a price, you type it in — the widget never shows a number it did not measure. WHAT IT DOES NOT DO Worth knowing before you install: • Walmart and Etsy get the profit widget only. X-Ray, COSMO and the listing score are built on Amazon-specific page signals and have no equivalent there. • The Keywords tab lists phrases pulled from the page itself. Search volume, rank and competition live in KeySpy on sellerniche.com, not in the extension. • Sales and revenue are estimates derived from BSR, not figures reported by Amazon. Use them to compare products, not to keep books. OPTIONAL DATA CONTRIBUTION While you are signed in, the extension can forward the public product facts already displayed on the pages you visit — ASIN, price, rank, rating, review count — to widen shared marketplace coverage. It never sends search queries, URLs, cookies, page HTML, or anything about you or your account, and it sends nothing at all while you are signed out. You can switch it off in the popup at any time. GETTING STARTED Install, then sign in with a free Seller Niche account. Paid plans raise the daily lookup limit and unlock the full toolset on sellerniche.com.