No demo, no sales call, no contract. Last checked .
Why switch
Why people look for SimplyDuty alternatives
1Free use needs registration and is capped at 5 calculations a day
2You need Section 232, 301 and other US tariffs itemized
3You want history and auditing for past entries
The list
6 SimplyDuty alternatives, ranked
Ranked by how completely each one answers a US importer's real question: what does this import owe, and why.
1
HTS Hero
US tariff calculator and auditor
Best overall for US importers
A US tariff calculator built for importers who need the exact number: every Chapter 99 tariff stacked line by line with its legal source, entry audits by date, duty over time, alerts when a tariff change hits your products, and results by API and MCP for your own systems.
Strengths
Every Chapter 99 tariff as its own line, with the heading and U.S. note behind it
Audit past entries: the duty on the entry date, from the HTS revision in force that day
Duty Over Time shows how a product's duty changed across revisions
Alerts when a tariff change hits your products, with what it costs each one
Published prices, monthly plans, start in a minute with no demo or contract
Tariff results by API and MCP, built into your ERP, TMS or internal tools
Limitations
US imports only
Verified historical rates start in April 2026
Price
Free, then from $14.99/mo
Best for
Importers, brokers and compliance teams who need exact, auditable US duty
The best-known free tariff calculator, run by the freight forwarder Flexport. The free tool handles single lookups; bulk upload, alerts and its other Pro features are for Flexport customers.
Strengths
Well-known brand with a polished interface and trade map
Free for 5 searches, then a free account
Entry-date rates back to January 1, 2025
Applies trade agreements such as USMCA automatically
Metal-content and melt-country questions for Section 232
Public changelog of calculation updates
Hundreds of dated worked examples
Free IEEPA tariff refund calculator
Limitations
Bulk upload, alerts and country comparison require becoming a Flexport client
No published price for Pro
One calculation at a time on the free tool
Its FAQ says not all Chapter 99 programs are supported
We found no handling of the September 29, 2026 Canadian import bans
Built as a funnel for Flexport's freight and customs business
Price
Free; Pro for Flexport clients
Best for
Quick one-off estimates, and Flexport freight customers
Avalara AvaTax Cross-Border calculates or estimates customs duty and import tax in online shopping carts, with HS-6 or HS-10 classification, for retailers selling across borders. It's built into stores and marketplaces rather than used as a standalone calculator.
Strengths
Duty and tax at checkout for many countries
Large ecommerce and marketplace integrations
HS classification services
Limitations
Designed for checkout estimates across many countries; US Chapter 99 itemization isn't documented
No published prices found
Price
Contact Avalara
Best for
Retailers that need duty and tax at checkout, in many countries
Landed cost at checkout for cross-border ecommerce
Zonos calculates and can guarantee landed cost at checkout for cross-border ecommerce, across 200+ countries and territories, with plugins for the major store platforms.
Strengths
Guaranteed landed cost at checkout
200+ countries and territories
Store platform plugins
Limitations
Designed for store checkouts, with no documented US Chapter 99 breakdown
No published prices on its landed cost page
Price
Not published
Best for
Cross-border stores that want guaranteed landed cost at checkout
Enterprise trade content for classification and tariff research: duty and tariff data for 152 countries and territories and 600,000 US and EU binding rulings, used by brokers, forwarders and large compliance teams.
Strengths
Duty data for 152 countries and territories
600,000 US and EU binding rulings
Established with brokers and enterprises
Limitations
Enterprise pricing, from about $750 per user
Built for many countries, more than most US importers need
Price
From about $750 per user
Best for
Large compliance teams researching tariffs in many countries
A free US tariff calculator from Flowyth Co of Austin, with an AI classifier, entry dates, a 200+ country comparison and Compliance Radar alerts in beta. The calculator needs no login; plan prices appear only after you log in.
Strengths
Broad free feature set with no login
Entry dates and a 200+ country comparison
AI classifier
Covers the 2026 Section 301, 232 and 338 programs
Limitations
Plan prices aren't published
No exemption questions: uncertain tariffs are shown as "Potential" and left out of the total
Trade agreements only in the paid area
Its calculator banner said "Revision 10" on October 6, 2026, when the current revision was 20
We found no handling of the September 29, 2026 Canadian import bans
Price
Free calculator; paid pricing not published
Best for
Teams that want a free calculator plus AI classification
Free to tryYou can calculate a real duty without paying.
YesFree to start, no sign-up
Partly5 calculations a day, registration required
Yes5 free searches, then a free sign-up
PartlyDeveloper sandbox and trial; no public calculator
PartlyFree US quoter, about 5 quotes
Start without a demo or sales callSign up and use every plan yourself, with no demo, contract or freight account.
YesEvery plan is self-serve, with no demo or contract
Yes
PartlyFree tool is self-serve; Pro needs a Flexport client account
NoCross-border is enabled by Avalara, after a demo
PartlySelf-serve on Shopify; otherwise through sales
Pricing publishedEvery paid plan's price is on the website.
Yes
YesIn GBP
NoPro has no published price
No
Partly$2 per order + 10% of duties and taxes
Every Chapter 99 tariff, line by lineThe base rate plus Section 232, Section 301 and every other additional duty, each as its own line with exemptions applied.
YesEach tariff on its own line, with its Chapter 99 heading and legal note
NoUS additional tariffs as one layer
PartlyBy tariff type; its FAQ says not all Chapter 99 programs are supported
NoOne import duty line in the API
NoOne duty total
Trade agreements and preference programsClaim USMCA, CAFTA-DR, KORUS and other programs and see the preferential rate.
YesUSMCA, CAFTA-DR, KORUS and every program on the line
PartlyUSMCA not modeled
YesApplied automatically when eligible
Yes
Partly
Exemption questions that change the dutyAnswer the facts that unlock exemptions (metal content, generics, donations and more) and see the new total.
YesAnswer each question and see the new total
No
YesMetal content, melt country and U.S. content
No
Not found
Audit past entries by dateCalculate the duty that applied on an entry date, to check what you paid.
YesEntry audits, with verified rates back to April 2026
No
YesBack to January 1, 2025, per its FAQ
PartlyA date field in the API
No
Duty over timeSee how a product's duty changed across HTS revisions.
YesDuty Over Time, revision by revision
No
Not found
No
No
Alerts when a tariff change hits your productsLoad your catalog once and hear when a change affects it, with the duty impact on each product.
Paid planTariff Tracker alerts, with the cost to each product
No
Customers onlyPro alerts, for Flexport clients
NoTariff news by blog and webinar
Customers only
Compare countries of originThe same product's duty from several countries, side by side.
Yes
No
Customers onlyPro, for Flexport clients
No
No
Bulk upload (CSV)Add many products at once.
Paid planTariff Tracker
Paid plan
Customers onlyPro, up to 500 rows
Customers onlyBy SFTP or API
Customers onlyBulk classification
HTS classification helpGuidance to find and document the right HTS code for a product.
Paid planHTS Hero Classify, with CROSS rulings
Paid plan£0.10 per call
YesHTS search and AI classification
Customers onlyAI plus human review, up to 24 hours
YesZonos Classify
API, MCP and ERP/TMS integrationGet tariff results inside your ERP, TMS, internal tools or AI assistant.
On requestAPI and MCP; plugs into ERP, TMS and internal tools
Paid planFrom £9.99/mo
NoNo public tariff API
Customers onlyREST API and MCP servers, for customers
Paid plan
Public changelog of rate updatesA dated record of every change to the tool's tariff data.
Yes
PartlyLast US update May 29, 2025
Yes
No
PartlyProduct changelog only
Checked against each tool's public website on October 6, 2026. “Not found” means we couldn't find it on the vendor's public pages, so we don't count it either way.
API and MCP
Plug HTS Hero into your ERP, TMS and internal systems
Get every tariff, exemption and fee for an import wherever you price, plan or file: in your ERP, your TMS, your own tools or an AI assistant. We'll set it up with you.
Tariff results by API, for your ERP, TMS or internal tools
An MCP server, so AI assistants can calculate duty
The same line-by-line results as the calculator
Start free
Looking past SimplyDuty? Try HTS Hero free.
Enter an HTS code and a country of origin and see the full US duty: the base rate, every Chapter 99 tariff and the fees. When you need unlimited calculations, it's $14.99 a month.
HTS Hero makes one of the tools on this page. We checked every claim about other tools against their public websites on October 6, 2026 and link our sources below. If something has changed, email [email protected] and we'll update it.
