Prep Center HQ
Sign inStart free trial
14-day free trial · $99/month locked for life

You run a prep center.
Not a spreadsheet factory.

A spreadsheet for every seller. A billing sheet on top of those. A phone full of “did my box arrive?” Prep Center HQ puts every seller on one system, builds the invoice from what shipped, and gets you paid. Automatically.

Start your free trialTry the sheet
  1. Incoming
  2. Received
  3. Shipped
  4. Billed
  5. Paid

Every row, start to finish, on one sheet.

Admin sheet · NorthlineTry me — tap Add packing
Active 48Archived 12ImportPaste+ Add rowClick status, client updates, or packing used
StatusOrderedRetailerDescriptionASINTrackingClient updatesQtyQty rec'dDate rec'dQty ship'dPacking used
10-02-2026AmazonStainless bottleB0N4K210TBA100000001240—0
09-18-2026WalmartKids headphonesB0H8Q3311Z999AA101101010-01-20260
09-12-2026TargetYoga matB0C2M90494001118996409-28-20260
09-04-2026AmazonCast iron panB0P7L118TBA1000000442209-20-20260
08-22-2026CostcoStorage binsB0R3T5521Z888BB2028809-02-20268
08-15-2026AmazonPhone caseB0K6W774TBA100000066121208-30-20260
08-02-2026WalmartCounter blenderB0D1S88094002221001108-18-20260
07-28-2026AmazonDesk lampB0F9A226TBA1000000884408-10-20260
The admin sheet for one seller. Status, the seller’s instruction, and packing open from the cell. Nothing here is saved.

The problem

Your center grew. Your system didn’t.

Spreadsheets got you here. They work at five sellers. At twenty, you’re the glue holding every file, message, and invoice together, and every new client makes it worse.

Too many files

A spreadsheet for every seller

Each client has their own file, their own columns, and their own version of “final.” You open twelve tabs to answer one question.

No automation

Nothing happens unless you do it

No status moves on its own. No invoice builds itself. No seller gets an update unless someone on your team types it.

Painful billing

Billing day eats a whole day

Copy shipped quantities into a billing sheet, multiply by rates, build each invoice by hand, then hope you didn’t miss a row.

Endless messages

“Did my box arrive?”

Texts, emails, and WhatsApp messages from sellers asking what your sheet already knows. Every answer is you stopping work.

The fix

Take yourself out of the middle.

Today every message, sheet, and invoice runs through you. With Prep Center HQ the work moves in a straight line, from the seller’s order to money in your account. You step in to review, not to retype.

Your week today

Everything runs through you

Today: messages, dozens of seller spreadsheets, a billing sheet, and payment chasing all run through you.YouSeller textsEmail threadsWhatsApp“Did my box arrive?”Staff group chatNorthline.xlsxHarbor (FINAL v3).xlsxCedar.xlsx+ 37 more sheetsBilling sheetInvoice templateChasing payments

Your week on Prep Center HQ

The work moves without you

With Prep Center HQ: seller portal, one shared sheet, an invoice that builds itself, and payment to your Stripe, in a straight line.live viewreview & sendYou1Seller portalThey register, sign, and pay your fee2One sheet, every sellerStaff scan in and mark shipped3Invoice builds itselfFrom shipped rows and your rates4Paid to your StripeCard payment in the portal. 0% cut.

Time saved at every step

Six jobs you do by hand. Six jobs we automate.

From the first email with a new seller to the day their payment lands, here’s what changes.

  1. 01

    Signing a new seller

    E-signed contract

    Emails back and forth for store name, address, a signed contract, and the sign-up fee. Days of follow-up.

    They register on your page, sign on screen, and pay your fee through your Stripe. You click approve.

  2. 02

    Taking in orders

    No retyping

    Sellers send orders in their own format. You or your staff retype them into the right sheet.

    Sellers add their own rows in their portal: retailer, ASIN, tracking, quantity. Same columns for everyone.

  3. 03

    Receiving

    Barcode scan

    Find the seller’s sheet, find the row, count, type the number, hope nobody else is editing.

    Scan the FNSKU or SKU. The count updates on the right row, with your staff member’s name on it.

  4. 04

    Keeping sellers updated

    Self-serve status

    Answer “did my stuff arrive?” all day by text, email, and phone.

    Sellers see status live in their portal. Incoming, received, shipped, billed.

  5. 05

    Billing

    Auto billing

    Copy shipped quantities into a billing sheet, multiply by rates, add packing, build invoices one at a time.

    Shipped rows land on a draft invoice at your rates, packing included. Bill everyone in one click, or on a schedule.

  6. 06

    Getting paid

    Card payments

    Send invoices, track who paid in your head, chase the rest.

    Sellers pay by card in their portal, straight to your Stripe. Overdue invoices flag themselves.

Problems you didn’t know you had

The spreadsheet is quietly costing you money.

These don’t show up as a line item. They show up as work you didn’t get paid for, disputes you can’t win, and invoices that go out late.

Packing you never billed

Poly bags, bubble wrap, mailers, and boxes get used on the floor and never written down. That’s free work, on every shipment.

Packing is recorded on the row. Your rate for each one becomes a line on the invoice.

Nobody knows who changed it

A quantity changes and there’s no history. When a seller disputes a count, it’s your word against theirs.

Every change to a quantity, status, or note keeps who made it and when.

A wrong invoice breaks the sheet

Fix the invoice and you still have to fix the sheet, or the same work gets billed twice. Or never.

Void an invoice and those rows go back to shipped, ready to bill again.

Your staff can see your margins

Your rates live in the same files your team edits all day. So do the totals you charge each client.

Staff work the sheet. Rates, invoices, and approvals stay with you.

One forwarded link exposes everyone

Shared sheet links get forwarded. One wrong share and a seller is looking at another seller’s inventory.

Each seller signs into their own portal and only ever sees their own rows.

Billing waits until you’re free

If you’re sick, slammed, or on vacation, invoices don’t go out. Cash flow depends on your calendar.

Turn on auto billing: a day each month, or every few weeks. It runs without you.

Do the math

What are the spreadsheets costing you?

Move the sliders to match your center. Just billing day and the packing that slips through. Not the messages, the disputes, or the late invoices.

Hours a month building invoices
13.3 h
Your time
$533
Unbilled packing
$150
The spreadsheets cost you, every year
$8,200

Prep Center HQ is $1,188 a year. The spreadsheets cost you 6× that.

Your numbers, your math. Unbilled packing is figured at $0.30 a unit, about one poly bag. Prep Center HQ builds the invoice from shipped rows, so the time left is a review and a send.

Billing

Your rates become the invoice.

Set the price for receiving, prep, boxes, and bags. Shipped rows turn into the lines. Send the invoice, or mark it paid when the seller pays your Stripe account.

Rates · Standard
Receiving, per unit$0.35
Outbound, per unit$0.45
Prep, per line$1.50
Bundling, per bundle$0.75
FBM, per unit$2.50
Oversize$3.50
Returns processing$2.50
Poly bags$0.25
Large poly bags$0.40
Mailers$0.30
Bubble wrap$0.30
Box, small$1.00
Box, medium$1.50
Box, large$2.25
Shoes$1.20
Books$0.35
Rates. Services, fees, and packing materials. You set the prices.
Invoice INV-1042

Summit Prep

1200 Example Ave
Austin, TX 78701
[email protected]

INVOICE

INV-1042

Sent

Bill to

Northline

[email protected]

Issued Oct 8, 2026

Due Oct 22, 2026

DescriptionQtyUnitAmount
Receiving · 40 units40$0.35$14.00
Outbound · 18 units18$0.45$8.10
Prep · 6 lines6$1.50$9.00
Poly bags40$0.25$10.00
Bubble wrap8$0.30$2.40
Mark paidVoid invoice

Total due $43.50

The invoice. Print it, or mark it paid. Example amounts.

Still on the fence?

What owners ask before they switch.

“Switching will take forever.”

Import the CSV or Excel files you already have, or paste rows in. Map your columns once and you pick up where you left off.

“My sellers won’t learn new software.”

They get a login and a sheet with only their rows. If they can use a spreadsheet, they can use this.

“I don’t want another company holding my money.”

We don’t. Card payments go to your own Stripe account, and we take 0%. Check, ACH, wire, Zelle, or cash can be marked paid too.

“It’ll get expensive as I grow.”

Unlimited clients, staff, and units. The monthly price stays the same whether you have 5 sellers or 500.

“What if it doesn’t fit my center?”

Run it free for 14 days with your real sellers and real shipments. If it isn’t saving you time, cancel before day 14 and you pay nothing.

Pricing

Grow the center.
Not the software bill.

Other tools charge per client, per store, or per unit. Move the sliders to see what that adds up to.

  • Prep Center HQ

    One price. Everything included.

    $99

  • PrepShipHub

    $199, then $0.01 per unit after 15,000

    $349

  • ShippingBrain Prep

    $297 for 3 stores, then $69 each

    $1,125

  • ScanPower 3PL

    $199, plus $20 per client

    $499

Monthly estimate from published prices as of October 2026. Staff seats are not counted.

Get your time back

One price. Every seller. Every step automated.

$149$99/month

Free for 14 days, then $99/month for as long as you’re subscribed. After the countdown, new centers pay $149.

  • 14 days free
  • Cancel anytime
  • Unlimited sellers
  • Unlimited staff
  • Unlimited units
  • Seller portal and sign-up
  • Auto billing and invoices
  • Barcode receiving
  • Card payments to your Stripe
  • Import your current sheets

14-day free trial

Try it free. Keep $99/month for life.

Tell us who you are. You’ll pick a password on the next page and be in your dashboard in a minute.

Free for 14 days, then $99/month for as long as the subscription stays active. Card required at checkout. Cancel before day 14 and you pay nothing.

Close the spreadsheets.
Open your next ten clients.

Every hour you spend copying rows is an hour you’re not spending growing the center. Try it free for 14 days and see how many you get back.

Start your free trialSign in