I built Zentria Flow because I kept seeing the same thing: importers price a product off the supplier invoice, then customs hits Section 301, IEEPA, VAT, fees and the real landed cost ends up 30 145% higher. Most duty calculators only show the base rate, so the gap blindsides people at the port.
So I'm curious for those of you who import (China, Vietnam, anywhere):
What's the worst customs/tariff surprise that wrecked a margin?
How do you currently calculate your true landed cost spreadsheet, broker, gut feel?
Hey Product Hunt 👋
I built Zentria Flow because importers keep getting blindsided by tariffs. Since 2025, a shipment from China can stack MFN + Section 301 + IEEPA and more than double in cost — and most "duty calculators" only show the base rate, so sellers price into a loss without knowing it.
Zentria Flow computes the full landed cost — every duty layer, VAT, freight and fees — for 70+ countries, in seconds. There's a free calculator (no signup) to try on a real product right now, plus a WooCommerce plugin.
I'd love your honest feedback — especially if you import from China, sell on Amazon/eBay, or run a Shopify/WooCommerce store. What's the worst customs surprise you've had? Happy to run any product through it for you. 🙏