WhatBox reads each Shopify order and prices it against Amazon MCF and your in-house shipping — Prime fee included — then routes it to the lane that wins. Amazon's own app can't do that: it profits when you pick Amazon.
Live and running in production today — not yet listed on the Shopify App Store. Apply for free beta access, or join the waitlist to hear about public launch instead.
Amazon now ships its own MCF + Buy with Prime app for Shopify. It's good at exactly one thing: making sure every eligible order routes onto Amazon. That's not a bug — Amazon earns the MCF fee (and the Prime fee) either way, so its own app was never going to tell you when shipping in-house is actually cheaper. Same story with every other MCF app we've evaluated: connect Amazon, sync stock, route orders — never a dollar amount, never a real comparison.
WhatBox computes your actual in-house cost — box, postage, labor — and puts it next to Amazon's real fee, Prime fee included, on every order, before anything ships. It works for every merchant out of the box: WhatBox has built-in carrier rates (USPS/UPS/FedEx/DHL), so you don't need your own shipping account to get a real number.
This is the whole product, distilled into one card on every order.
Work through a whole day's orders without opening each one individually.
No guessing what Amazon will charge after the fact — you see it before you click.
One order, one shipment — guaranteed, not just hoped for.
You find out when something's wrong before your customer has to tell you.
The cheaper option isn't always available — WhatBox tells you when that's costing you.
Every dollar, on every order, written down in plain English.
These aren't live yet — they're on the roadmap.
The same math, beyond the US — today's comparison is US-first.
Real shipping rates at checkout, not estimates.
One connection covering more than a single Amazon marketplace.
As they open up (e.g. TikTok's new FBT), the decision card generalizes — Amazon vs. TikTok FBT vs. in-house, cheapest wins.
No add-on menu, no shipping account required.
Free to install, not to run — WhatBox pays for itself on the orders it keeps off Amazon MCF. Launch pricing, subject to change as we head to public launch. Metered on orders actually shipped through Amazon MCF, never per marketplace.
Every plan includes every marketplace and all features — no add-on menu, ever. Metered only on orders actually shipped through Amazon MCF ("pay when we ship through Amazon"). 14-day trial on paid plans. No card required for Free. Order-volume caps are provisional launch pricing.
We're opening up free access to a small group of merchants ahead of the public Shopify App Store launch. You'll run WhatBox MCF on real orders at no cost — in exchange, we'll lean on you for feedback: bugs, rough edges, and the stuff that's confusing before it's obvious to us.
This is pre-launch software. Expect some sharp edges, and use it with the caution that implies. If that's a fair trade for free access and a direct line to shape the product, we'd like to hear from you.
WhatBox ERP knows what every unit really costs — purchasing, receiving, and true landed cost in one place. Built by the same team.
Built by a merchant,Princeton Popcorn is a real popcorn business selling on both Shopify and Amazon. Its founder ran both channels and kept guessing which orders MCF should ship — no tool would just show the two costs side by side. So he built one.
WhatBox MCF has been running in production on Princeton Popcorn's own orders since day one. It's not a concept — it's the tool that stopped the guessing, now being opened up to other merchants who carry FBA inventory and pack their own DTC orders.
WhatBox is built and operated by Snorka, LLC — a US software company run by an active Shopify + Amazon seller.
It's live and running in production — just not yet listed on the Shopify App Store (we're in a custom-distribution phase ahead of public launch). Join the waitlist and we'll bring you in for early access.
Free up to 10 Amazon-fulfilled orders/month, then $49.99, $79.99, or $99.99/month depending on volume — every plan gets every marketplace and every feature, metered only on orders actually shipped through Amazon MCF. Paid plans include a 14-day trial.
Amazon's app is great at exactly what it's built for: putting your orders on Amazon. It doesn't — and structurally can't — tell you when shipping in-house is actually cheaper, because Amazon earns the fee either way. WhatBox is the neutral layer underneath: it prices every order against both lanes, Amazon MCF with the Prime fee included and your real in-house cost, and routes to whichever wins, even when that's not Amazon. It also flags which SKUs are actually worth turning Buy with Prime on for, so you're not eating a 3% fee on units where it never pays off.
No — Buy with Prime and the Prime badge are Amazon's own program. WhatBox is the decision layer that tells you when using it (or MCF) is actually worth it, order by order and SKU by SKU. Think of us as the referee, not the badge.
No. WhatBox MCF has built-in carrier rates (USPS/UPS/FedEx/DHL), so you get a real in-house cost with zero setup. If you already have negotiated rates in ShipStation, WhatBox will use those instead for an even more precise number.
Yes. Split orders send some lines to Amazon MCF and the rest through your own process, with honest three-way math since a split ships as two separate packages.
No. Price guard is raise-only — it alerts you when your Shopify price undercuts Amazon and gives you one-click fixes, but it never lowers your prices automatically.
The watchdog tracks every sent order against Amazon's own promised date. If it's late, undeliverable, returned, or lost, you get an email with the reason and one-click fixes — retry at Amazon, or release it back to in-house shipping.
Beta means using WhatBox MCF now, free, on your real orders — in exchange for feedback while things are still being smoothed out. The waitlist is lower-commitment: it just gets you an email when WhatBox MCF is publicly available on the Shopify App Store. Pick whichever fits how hands-on you want to be right now.
When you route an order through Amazon MCF, we use your buyer's name, address, and phone number solely to create that buyer's own MCF shipment via Amazon's SP-API — never for marketing, resale, or analytics. Full details, including what we collect, how it's stored, protected, shared, and deleted, are in our Privacy Policy.
Click the chat bubble in the bottom-right corner of any page.
The waitlist is the lower-commitment option — no beta, no rough edges, just an email when WhatBox MCF is publicly available on the Shopify App Store. Want to use it now instead? Apply for beta access.