De minimis is gone. Your checkout may be undercharging duties.

An HTS code is the 10-digit US Harmonized Tariff Schedule number that determines the duty rate on an imported product. Since the US de minimis exemption ended, shipments that previously entered duty-free under the $800 threshold now clear customs against a specific code, so every product you ship into the US needs one.

Yes, and it does it in two passes rather than one. The first pass reads your Shopify product data and proposes the tariff heading and subheading. A second pass then reads the actual 10-digit statistical lines published under that subheading and picks the one that fits, so the last four digits are chosen from the real schedule instead of written from the model's memory. You get a 10-digit code with a confidence score and a plain-English rationale. Suggestions are for your review — DutyLookout is not a customs broker and does not certify classifications.

Because it is resolved against the tariff revision that is currently published before you ever see it: a 10-digit code that does not exist in that revision is rejected rather than shown. Where an 8-digit prefix covers several statistical lines that can carry different surcharge treatment, DutyLookout will not pick one by digit order — it sends the product to the line-selection pass, and if that cannot decide either, the product is flagged for a person. The same existence check runs again at the moment a code is written back to Shopify, against the revision published at that moment rather than the one in force when the suggestion was made. This guarantees the code exists in the current schedule; it does not certify that it is the right code for your goods, which remains your decision as importer of record.

No. A code you already hold is tried first, before any AI call is made. If it is a full 10-digit line that exists in the current published schedule it is kept as yours and marked as such. If it does not validate — a retired line, a typo, or a 6-digit code that cannot carry a duty estimate — the product is flagged for a person to decide, with the reason stated, and is never silently replaced. The write-back step refuses to overwrite a code you entered or overrode, independently of how the suggestion was produced.

No. It is an estimate based on the published general rate for the suggested code, shown with the dated schedule snapshot it came from. Actual landed cost depends on country of origin, trade programme eligibility, customs valuation, and shipment-specific fees, and may include antidumping or countervailing duties that a general rate does not capture.

Yes. The free lookup at https://dutylookout.com/lookup classifies a single product description with no account and no payment. It is capped — a limited number of lookups per visitor per day, plus a shared daily allowance across everyone using it; when that allowance is spent the page says so and it resets at 00:00 UTC. It also runs a smaller model than your catalogue does, so treat it as a preview of the format and the reasoning rather than a guarantee of the same code. Installing the app is what removes the cap, extends this to your whole catalogue, and adds tariff-change alerts.

DutyLookout checks the published US tariff schedule daily and raises an alert naming the specific products affected and how the rate moved, rather than a general notice you have to interpret. You can also receive a daily email digest.

There is no monthly subscription. The first 25 product classifications each month are free, after which classifications are billed at graduated rates from $0.090 down to $0.032 each. Classifying a 1,000-product catalogue costs about $56 once, and only newly added or materially changed products are billed after that. There are no catalogue size limits, nothing to prepay, no credit packs to buy or leave unused, and tariff-change monitoring is included rather than sold as a monthly add-on.

Four things that cost money on every product. First, two model passes instead of one: a classification pass, then a separate verification pass that picks the 10-digit line from the real published tariff lines under the chosen subheading. Second, your catalogue runs on Claude Sonnet 5, a frontier model, rather than the smaller model the free public lookup uses. Third, the duty figures are not produced by AI at all — they are deterministic arithmetic against a dated, versioned snapshot of the published schedule, with surcharge programs resolved by their effective-date windows. Fourth, daily tariff monitoring is part of the price rather than a separate monthly line item. There is no monthly fee and nothing to prepay, so the only thing you are buying is the classification itself.

Product catalogue data only, using the read_products and write_inventory scopes. It never requests customer scopes and stores no customer personal data. Product text is sent to an AI provider for classification; duty calculations are deterministic and involve no AI.

No. It classifies and prices for US import only. It does not cover the EU, UK, Canada, or any other customs territory.