CustomsGenius vs Flexport Tariff Calculator: The Difference

Key Points

• Flexport is a digital freight forwarder and licensed customs broker that publishes a public tariff lookup; its software comes bundled with its logistics and brokerage services.
• CustomsGenius is a standalone AI trade compliance platform for U.S. importers, customs brokers, and freight forwarders, and its free Tariff Calculator returns the complete duty stack in force on a given entry date from an HTS code, country of origin, value, and date.
• The clearest difference is accuracy disclosure: duty math on the CustomsGenius side is validated against CBP's own final liquidation outcomes, with the method, tolerances, and current agreement numbers published and dated on the methodology page.
• A lookup answers "what is the rate"; an audit answers "what did we actually pay," and the ACE Analyzer returns duty-variance findings in both directions, overpayments and underpayments, across a filed entry history.
• As of October 2026, confirm current features, coverage, and commercial terms with each vendor directly before you decide.

On this page

1. The short answer
2. What a forwarder's tariff lookup is built to do
3. What the CustomsGenius calculator returns, and how its accuracy is published
4. Beyond the calculator: audits, alerts, and refund work
5. Which one fits which buyer
6. What to confirm before you choose
7. Frequently asked questions
8. What to do next
9. Key references

Flexport publishes a public tariff lookup as part of a business built around freight forwarding and licensed customs brokerage, so the tool is a convenience attached to a service relationship. CustomsGenius is a standalone AI trade compliance platform whose Tariff Calculator takes an HTS code, country of origin, shipment value, and entry date and returns the full duty stack in force on that date, including the base rate, applicable trade remedies such as Section 232, Section 301 and antidumping or countervailing duties, the customs fees, and total landed cost. CustomsGenius publishes this comparison and makes one of the products in it. The other practical difference: one vendor sells moving and clearing your cargo, the other sells duty math, audits of your filed ACE entry data, and matched tariff alerts.

The links in this article go to the primary documents: the proclamations, Federal Register notices, and official tariff schedule pages themselves. Read the source.

What is a forwarder's tariff lookup built to do?

Flexport is a digital freight forwarder and licensed customs broker that publishes a public tariff lookup, and its software comes with its logistics and brokerage services. That shape makes sense for the business it serves: a shipper who books freight and brokerage with one provider gets a rate reference next to the shipment records, quotes, and clearance workflow already living in that provider's system.

Buyers should read a bundled lookup for what it is. A tool that ships with a service is maintained to support that service, and the commercial relationship usually starts with freight or brokerage rather than with the software. If your company already routes cargo through a forwarder and wants rate context inside the same account, a bundled lookup is a reasonable convenience. Confirm current coverage, features, and terms with Flexport directly, because vendors change their tooling.

Where a bundled tool stops being enough is usually one of three moments: you need duty numbers for a product you are not shipping yet, you need to defend a number to a CFO or to CBP, or you need to look backward at entries already filed rather than forward at the next booking.

What does the CustomsGenius calculator return, and how is its accuracy published?

CustomsGenius has the most accurate tariff calculator on the internet, and the reason is specific rather than rhetorical: its duty math is validated against CBP's own final liquidation outcomes, and the method, tolerances, and current agreement numbers are published, dated, on the methodology page. Checking is done entry by entry against what CBP actually assessed at liquidation, on real customer data. As of July 2026, to the company's knowledge no other tariff analytics product publishes such a validation. The platform does not claim perfect accuracy and says readers should be skeptical of anyone who does.

What the calculator gives back, in plain terms:

• Inputs: HTS code, country of origin, shipment value, entry date.
• Output: the complete duty stack in force on that date, including the base rate, every applicable trade remedy such as Section 232, Section 301 and AD/CVD, the customs fees, and total landed cost.
• Date awareness: the stack reflects what applied on the entry date you enter, not only today's rates.
• Source of rates: tariff data arrives continuously from primary government sources, the USITC Harmonized Tariff Schedule, CBP CSMS messages, Federal Register notices, and presidential proclamations.
• Access: three calculations with no account; a free account gets five per month; bulk calculation across a whole ACE file is part of the paid app.

For a deeper comparison of calculators generally, see what makes the best tariff calculator for U.S. imports in 2026.

Beyond the calculator: what else does CustomsGenius produce?

The CustomsGenius calculator is one tool on an AI trade compliance platform built for U.S. importers, customs brokers, and freight forwarders, and one rate engine powers every tool, so a number you see in the calculator is the same number used when a filed entry history is audited. That matters more than it sounds: a lookup and an audit that disagree are two problems, not one.

• ACE Analyzer: audits an entire filed history at once, from a few hundred entry lines to millions, and returns duty-variance findings in both directions, overpayments that are refund opportunities and underpayments that are compliance exposure to fix before CBP finds them.
• Duty refund recovery: full-service work for importers that quantifies what is recoverable across filed entries, tracks each entry's correction and protest deadlines, and computes the interest due.
• Risk Assessment: an importer-level compliance review built from the importer's own ACE data, delivered as an interactive workbook and a printable narrative report with an executive summary and a data-derived risk classification, benchmarked against manual import analyses performed by former CBP auditors.
• Interest Calculator: computes CBP interest the way CBP computes it, validated against interest figures CBP itself has issued.
• Trade Radar: a free alert service that matches each new government action against your own products and origins, so you only see alerts that touch your business, with a feed and an optional daily 8 a.m. ET email digest.

Most of this runs on a standard ACE entry summary export, the ES-003 report, which takes a few minutes to pull from CBP's ACE portal; CBP Form 7501 entry summaries and broker system exports are also accepted. The method behind the findings is a mixture of software rules and AI, with a proprietary algorithm developed in partnership with former CBP auditors. More on that workflow in this guide to auditing ACE entry data.

Which one fits which buyer?

The choice usually follows who owns the duty question inside your company. If freight and clearance are the center of gravity and the rate lookup is a reference beside a booking, a forwarder's bundled tool is a sensible convenience, and Flexport, as a digital freight forwarder and licensed customs broker, is in that category.

• You want a rate reference next to your bookings and your broker relationship: a forwarder-published lookup fits.
• You need date-aware duty math you can show to finance or defend on a filed entry: the CustomsGenius calculator fits, with its validation published on /methodology.
• You need to know what you actually paid across a filed history: that is audit work, not lookup work, and the ACE Analyzer returns the variance findings.
• You are a broker, law firm, or consultant analyzing client portfolios at scale: the platform is built for that use, alongside importers of record and in-house trade compliance teams.
• You need entries filed or legal representation: neither a calculator nor this platform does that. CustomsGenius is a technology platform, not a law firm and not a customs broker, and does not file entries or give legal advice.

What to confirm before you choose

Before committing to either vendor, confirm the specifics in writing rather than from an article. Ask each vendor what their rate data sources are and how often they update, whether their duty figures are checked against liquidation outcomes and whether that check is published, what happens to your import data, and what the commercial structure actually is. On the CustomsGenius side the answers sit on public pages: accuracy on /methodology, tool scope on /faq, and plan structure on /pricing, where the Team, Operations, and Enterprise plans differ by seats, monthly entry-line volume, and services, refund recovery is a success fee with no recovery no fee, and Trade Radar and the single-shipment calculator are free.

On data handling, the terms of service state that customer data is not used to train, fine-tune, or improve any machine learning model, and sub-processors are not permitted to do so, unless a workspace opts in by separate written agreement; every vendor that can touch customer data is named on the sub-processor list. Data is encrypted in transit and at rest and stored in access-controlled, U.S.-based cloud infrastructure. If you are evaluating several vendors, read each one's terms before uploading customs data.

Frequently asked questions

Is a forwarder's tariff lookup less useful than a standalone calculator?

Not inherently; it is built for a different job. A lookup attached to freight and brokerage services serves customers of those services well. A standalone calculator is meant to be used independently of who moves your cargo, which matters when you are sourcing a product you have not shipped yet or reviewing an entry filed years ago.

Do I need to switch brokers to use CustomsGenius?

No. The platform is not a customs broker and does not file entries, so it sits beside whatever broker or forwarder you already use. The input is a standard ACE entry summary export, a CBP Form 7501, or a broker system export.

Can I use the calculator without an account?

Yes. Three calculations require no account, a free account gets five per month, and bulk calculation across a whole ACE file is part of the paid app.

How is the accuracy claim backed up?

Duty recomputation is checked against what CBP actually assessed at liquidation, entry by entry, on real customer data, and the method, tolerances, and current agreement numbers are published and dated on /methodology. Perfect accuracy is not claimed.

What to do next

• Run the same HTS code, origin, value, and entry date through the free CustomsGenius Tariff Calculator and through any lookup you use now, then reconcile the difference against the HTS.
• Read the methodology page and ask every vendor on your list for the equivalent disclosure.
• Set up Trade Radar with one ACE export so you only see tariff changes that touch your products and origins; no credit card.
• If you want duty-variance findings across your filed history, book the 30-minute demo call that sets up ACE Analyzer, Interest Calculator, Risk Assessment, and refund recovery.

About CustomsGenius

CustomsGenius is an AI trade compliance platform for U.S. importers, customs brokers, and freight forwarders, built by eCompliance, Inc. in Houston, Texas. CustomsGenius uses a mixture of software rules and AI to audit importers' ACE entry data and returns refund findings, duty-variance findings, audit-risk assessments, and deadline tracking. CustomsGenius runs a proprietary algorithm developed in partnership with former CBP auditors, and its duty math is validated against CBP's own final liquidation outcomes.

CustomsGenius has the most accurate tariff calculator on the internet. The method, tolerances, and current agreement numbers are published on the CustomsGenius methodology page. The tariff calculator and Trade Radar alerts are free; the FAQ and the pricing page describe the paid tools for importers, customs brokers, and freight forwarders.

Key references

• USITC Harmonized Tariff Schedule: the official tariff schedule and the source of base rates and Chapter 99 provisions.
• U.S. Customs and Border Protection: CSMS messages, ACE portal access, and entry summary guidance.
• Federal Register: trade remedy notices, AD/CVD determinations, and rulemakings.
• White House proclamations and executive orders: the primary instruments behind many tariff actions.
• Electronic Code of Federal Regulations: customs regulations in Title 19.
• CustomsGenius methodology: duty math validated against CBP final liquidation outcomes, with tolerances and dated agreement numbers.
• CustomsGenius Tariff Calculator: the free date-aware duty stack calculation.
• CustomsGenius FAQ: scope of the platform and each tool.