DutyCalc vs Zamp ‑ Sales Tax Dashboard
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 13, 2026 for DutyCalc, Nov 5, 2026 for Zamp.
The short answer
- Only DutyCalc lists a free plan.
- Zamp lists 2 features DutyCalc’s listing doesn’t mention, including Multi-currency, Rate management.
Head to head
Free
- · 10 duty lookups per month
Pro
- · 1,000 duty lookups per month
Team
- · 10,000 duty lookups per month
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureDutyCalc scans your product catalog for missing HS/HTS codes and country-of-origin metadata, then calculates current US tariff exposure for ready SKUs. Review base duty, Section 301, Section 232, reciprocal tariffs, total estimated duty, AD/CVD risk, and margin impact before you reprice, reorder, or send products for broker verification.
See exactly how sales tax is calculated. Zamp breaks down every order by category and product, maps the tax jurisdiction, and lets you search by order number for instant answers. Built for merchants who need to know, not guess. Need more than calculations? Zamp's full-service solution removes sales tax from your plate entirely. Visit Zamp.com to schedule a free nexus assessment today.
- Instant duty rate lookups across 35,000+ HTS tariff codes
- Full duty breakdown at checkout including base, Section 301, 232, and reciprocal
- Simple setup with HS code metafields and a usage tracking dashboard
- View tax totals by product category with visual charts
- Expand any product to see jurisdiction breakdowns
- Search orders by order number
- View shipping tax calculated separately
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  DutyCalc |  Zamp |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | DutyCalc | Zamp |
|---|---|---|
| App Store rating | Not published | 5.0 ★ |
| App Store reviews | Not published | 2 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
FAQ
DutyCalc and Zamp: common questions
- Is DutyCalc or Zamp cheaper?
- Only DutyCalc lists a free plan. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- Zamp lists 2 the others don’t mention, such as Multi-currency, Rate management. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 13, 2026 for DutyCalc, Nov 5, 2026 for Zamp; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 13, 2026 for DutyCalc, Nov 5, 2026 for Zamp. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.