QuantSeller

Know what each product really earns before you set a price, buy inventory, run a promotion, or begin production. QuantSeller is an offline-first profit, pricing, production, and inventory workspace for Etsy makers, Amazon sellers, and e-commerce businesses. Records stay on your device. No QuantSeller account, marketplace login, OAuth connection, or seller API is required. ### 18 seller calculators - Etsy profit, handmade pricing, Offsite Ads, shipping, discount, and labor tools - Amazon FBA profit, ROI, monthly profit, arbitrage, referral fee, FBA versus FBM, advertising break-even, and reorder tools - General break-even, campaign, digital product, and product idea tools ### Materials, recipes, and production - Create unlimited materials, product recipes, and bills of materials - Include labor, waste, packaging, overhead, ads, returns, tax, and shipping - Record production runs and stock movements - Track manual orders through production, packing, ready, and completed stages - Plan local Amazon inventory without connecting Seller Central ### Private and practical - Workspace data remains on the device - Core calculations and records work offline - English, Turkish, German, Spanish, French, and Italian - Light, dark, and system appearance modes - All calculators and workspace tools are included - The app is supported by banner advertising QuantSeller provides planning estimates based on the values and rates you enter. Marketplace fees, tax rules, advertising programs, and platform policies can change. Verify important decisions using current marketplace documentation and qualified accounting or tax advice. QuantSeller is independent and is not affiliated with, endorsed by, or sponsored by Etsy, Inc. or Amazon.com, Inc.