What we are building
KuajingSuan brings profit, advertising, and logistics calculations into one lightweight bilingual toolkit for Amazon FBA, Shopify, and China-origin cross-border sellers.
How the first version works
The six calculators run in your browser without registration, cloud records, payments, live rates, or automated marketplace data collection.
Our standard
We show formulas, examples, assumptions, and limits so you can review an estimate before using it in a business decision.