Lanternwright

For resellersworking name

Netkeep

A web app for resellers, planned for January 2027.

What each sale actually made, worked out from the reports you already download.

It shows which purchases actually paid off.

Netkeep's Sales page for an eBay sample shop: totals for sales, marketplace fees, cost of the items and profit, a note that two sales still need a cost matched, and a table of sales with the fees, label, refund, cost and profit on each line. Click to try it
A made-up shop with a year of sales behind it: what each one actually made after fees, shipping and what the item cost, and the year-end figures a tax preparer asks for. Every sale, cost and buyer in it is invented.

Netkeep launches in January, for the tax season it is built for. Its importers read the reports eBay, Etsy, Poshmark and Mercari already give you.

Netkeep reads the sales reports you already download from eBay, Etsy, Poshmark and Mercari and works out what each sale really made after fees, shipping labels, refunds and the price paid for the thing. It tracks cost per item and per lot, expenses and mileage, and builds a year-end package to hand to whoever does the taxes. It runs in the browser, works offline, and never asks for a marketplace login or a bank login.

Who it's for

Part-time resellers on eBay, Etsy, Poshmark, Mercari and Facebook Marketplace who buy at thrift stores, estate sales and in mixed lots, and whose numbers currently live in a spreadsheet, a notes app or nowhere. It's not built for businesses with employees, sales-tax filing or accrual accounting.

What it does

  • Reads the reports you already download. eBay's Orders, Transaction and Earnings reports, Etsy's Orders, Order Items and monthly statement files, Poshmark's Sales Report and Mercari's sales report. Anything else goes through a column matcher once, and Netkeep remembers it.
  • Doesn't double count. If two eBay downloads overlap, the overlap only counts once.
  • Leaves buyers out of it. Names, usernames, emails, phone numbers and addresses get dropped before anything is saved.
  • Knows the fees. It uses the fees in the reports, or dated estimates you can edit when a report doesn't have them. Sales tax the marketplace collected stays on its own line.
  • Handles lots. Split a haul evenly, by estimated value or by your own numbers. Adding a purchase at the store takes three taps, receipt photo included (with the location data stripped off).
  • Profit per sale. After fees, labels, refunds and the purchase price, with sales matched to items by SKU.
  • Keeps a mileage log. Expenses by category, too. A trip with no business purpose gets flagged, not refused.
  • Makes the year-end pile for a tax preparer. Profit and loss, a Schedule C Part III cost-of-goods worksheet, the mileage log and an expense summary, printable or as CSV files.
  • Backs up everything, photos included. Restoring never overwrites newer records, and delete everything really means everything.

What it doesn't do

  • It doesn't file anything, and it isn't tax advice.
  • It doesn't decide what's deductible.
  • It leaves the inventory method to the tax preparer.
  • It never says what to charge.
  • Rows in another currency are named and skipped.

A few more screenshots

Netkeep on a phone after importing an eBay Orders report: 20 new orders, and a list of the 19 buyer columns it left out, such as buyer name, email, address and phone number.
After an import, Netkeep lists the buyer columns it dropped before saving anything.
A Schedule C Part III cost of goods sold worksheet for tax year 2026, lines 33 to 42, with buttons to print or download a CSV and a line saying it's an organizer for a tax preparer, not tax advice.
The cost-of-goods worksheet for a tax preparer, from the same sample shop.

Questions

Do I have to connect my eBay or Etsy account?
No. Netkeep reads report files downloaded from the marketplace. It never asks for a marketplace login or a bank login.
Is this tax software?
No. Netkeep organizes records for a tax preparer. It isn't tax advice and it doesn't file anything.
Where is my data?
In the browser's storage, on your device. There's no account and no server that receives any records. Netkeep asks the browser to keep those records rather than clear them when space runs short, and Safari offers no way to ask, so back it up to a file: that copy is yours and no browser can touch it.

What it keeps, and where

Sales, costs, receipts and trips stay in the browser's storage on your device. There's no Netkeep server, so the records have nowhere else to go.

Goes online only for: Update check (off until you turn it on).

The full Netkeep privacy section

Runs on, and what it'll cost

Runs on
Web app for phone, tablet and desktop browsers (Chrome, Edge, Firefox and Safari). Installable, and works offline.
Cost
Free covers every number for one platform at a time and the tax year in progress, including per-item profit. Pro is planned as a one-time purchase that adds every platform together, earlier years and the tax preparer package, with a year of fee and mileage table updates. A free hardship license will be available on request. The price will be announced at launch.

An organizer for a tax preparer. Not tax advice.

eBay, Etsy, Poshmark, Mercari and Facebook are trademarks of their respective owners. Netkeep is not affiliated with or endorsed by any of them.