Rethat is a Seller Operating System built for marketplace sellers who want clarity in their numbers. If you sell on Amazon or Flipkart, hidden fees, GST, shipping, returns, and ad spend can quietly reduce your profit. Rethat combines 30+ essential tools into one simple dashboard including profit calculators, commission estimators, break-even analysis, inventory tracking, and ROI tools. No messy spreadsheets. Just clear numbers to help you sell smarter and grow confidently.