TradeOS reads your invoice, pins the correct HS code, and checks it against 16 FTAs (EVFTA, RCEP, CPTPP, UKVFTA...) to find duty savings you're leaving on the table, then auto-drafts the C/O paperwork (EUR.1, Form E, REX) to claim it. Built specifically for Vietnamese exporters, not adapted from a generic trade tool: bilingual VI/EN throughout, rules of origin checked against each agreement, and every classification comes with a confidence score and rationale you can verify before you declare.