Software that gives merchants their money — and their time — back.
Cartwright Labs builds Shopify apps around one question: what is this costing you today? TariffLine stops import costs from coming out of your margin. GroupOrder stops group sales from turning into a week of chasing payments. You keep selling; the apps handle the expensive, tedious parts.
Both apps are in Shopify App Store review now — full pages below, and early access by the form at the bottom of this page.
Built by Cartwright Labs — small team, focused tools, honest pricing.
TariffLine
Import costs collected, not absorbedYour surcharge is added at checkout on eligible orders, automatically.
GroupOrder
One link collects everyone's paymentThe whole group pays up front — you ship a single bulk parcel.
Every app
14 days free, flat monthly priceNo percentage of your sales. No surprise tiers. Cancel anytime.
TariffLine
For Shopify · In App Store review
For Shopify merchants who import products.
Stop paying your customers' tariffs out of your own pocket.
Every imported product you sell carries a tariff or import cost. If you don't pass it on, it quietly comes out of your margin on every single order — and raising all your prices to cover it punishes the customers who were never the problem.
Set your rate once per country.Tell TariffLine what imports from China, Vietnam, India — wherever you source — cost you. That's the whole setup.
Collected at checkout, on eligible orders.Your customer sees one clear, honestly labeled surcharge line before they pay. No surprises, no math for you afterward.
See exactly what you recovered.A running report shows the surcharge collected on every order, by country — ready to check against what you actually paid.
Your rates, set once. TariffLine reads the country of origin already on your products — nothing to re-enter. Products without origin data simply aren't surcharged.
GroupOrder
For Shopify · In App Store review
For clubs, schools, teams and fundraisers selling group merchandise.
Everyone pays through one link. You ship one parcel.
Group sales — team kits, club merch, fundraiser tees — usually mean collecting sizes in a spreadsheet, chasing twenty people for money, and shipping twenty separate boxes. The order makes money; the week you spend running it doesn't.
One link does the collecting.Share it with the group. Each person picks their size and pays at checkout like any normal order — no payment apps, no IOUs, no chasing.
You always know who has paid.One roster shows every participant, their size, and their payment status — and the deadline keeps the group moving.
One bulk parcel, not twenty shipments.Everything ships together to the organizer. One box, one postage bill, one handoff.
What your group sees. One page, a clear deadline, and no confusion about how delivery works — stated up front, before anyone pays.
Small tools, built properly.
We're a small studio, and we like it that way. Every Cartwright Labs app does one job, does it completely, and charges a flat price you can read in one glance.
Your subscription looks after itself
If a payment ever lapses, your settings and your data stay right where you left them — and everything switches back on the moment you're current again. No re-setup, no lost work.
Your data stays yours
We collect only what each app needs to work, we never sell it, and when you uninstall, your store's data is deleted. The full detail is on our privacy page — in plain language.
A person answers support
Email reaches the people who built the app. If something breaks at the worst possible moment, you're talking to the team that can actually fix it.
Built by Cartwright Labs
Cartwright Labs is a small team building focused Shopify apps — not a portfolio of dozens of tools. The same people who build the apps answer support, so when you write in, you're talking to someone who knows the code and can actually fix things.
We price flat, explain how each app handles your data in plain language, and delete your store's data when you uninstall. No invented results, no borrowed testimonials — just the products, what they do, and what they cost.
