Reseller Apps: The Tools Resellers Use for Sourcing, Photos, Listing, Shipping and Tax

Reseller apps are the tools a reseller uses to find stock, photograph it, list it, price it, ship it and keep the books. A seller with 20 items can run all of that from a phone and a notebook. Past a few hundred items, each job needs its own tool, or one tool that does several. This guide takes the jobs in order and names the tools sellers in the US and UK actually use, with prices checked on 9 November 2026.

We make FLUF Connect, which covers several of these jobs, and we say where another tool is the better choice.

What Apps Does a Reseller Need?

Which Apps Help You Source and Price Stock?

The best sourcing tool is a record of what actually sold, and the price it sold for. eBay Product Research, formerly Terapeak, is free in Seller Hub and shows up to three years of eBay sold prices, including accepted offers. The public “Sold items” filter on eBay search only goes back 90 days. Google Lens is free and identifies an item from a photo, but it shows current asking prices, which run higher than sold prices.

Specialist tools earn their fee in one category each. ScoutIQ scans book barcodes for Amazon sellers, from $14 a month, with a 14-day free trial. Its offline database covers the US and UK. WorthPoint is a price guide for antiques and collectibles at $26.99 a month. The free Amazon Seller app scans a barcode to show current offers.

Which Apps Are Best for Product Photos?

A phone, daylight and a plain background do most of the work. Software fixes the rest. Snapseed is a free editor with no subscriptions, ads or watermarks, good for straightening and brightening. For white backgrounds, Photoroom Pro costs $12.99 a month or $89.99 a year. remove.bg starts at $9 a month for 40 images, and Canva includes a limited number of free background removals.

FLUF Connect has photo tools built in. You can turn your phone into a camera for the FLUF dashboard on your laptop by scanning a QR code, remove backgrounds with credits (paid plans include 100), and upload up to 20 photos for AI to draft the title, category, condition and description. Starter includes 50 AI listings a month and Pro includes 250.

How Do Resellers List on Several Marketplaces?

With a crosslisting app. You create the listing once, send it to each marketplace you sell on, and the app removes it from the others when it sells. Without one, a seller on three marketplaces types every listing three times and delists by hand after every sale. The choice of crosslister depends mostly on which marketplaces you use. Vendoo, Flyp and List Perfectly suit US sellers on Poshmark, Mercari and eBay. FLUF Connect covers 80+ marketplaces, including Vinted, Wallapop, Kleinanzeigen, Marktplaats and leboncoin. Our crosslisting app comparison covers seven of them, with prices and marketplace lists.

Which Tools Handle Pricing, Offers and Relisting?

Once stock is listed, three jobs repeat every week: cutting prices on slow items, answering offers, and refreshing old listings so they show up in search again. Each marketplace has its own tools, such as eBay’s promoted listings and Vinted’s bump. A crosslister can do these across all your marketplaces at once.

On FLUF Connect’s Pro plan and above, smart pricing lowers prices on a schedule down to a floor you set. Offers on Depop, eBay, Vinted, Vestiaire Collective and Poshmark are accepted or countered automatically, within a discount limit you set. Old listings are relisted automatically on 18 marketplaces. Inventory Intelligence flags items that haven’t sold, and Bulk Jobs changes prices or relists hundreds of items in one go.

Which Shipping Apps Do Resellers Use?

On most resale marketplaces you don’t need a shipping app at all. Poshmark emails a prepaid label, $6.49 paid by the buyer, for parcels up to 5 lb. On Vinted the buyer pays postage and you get a label or QR code in the chat. Shipping apps matter for sales you post yourself, such as eBay, Etsy, Shopify and Facebook Marketplace.

UK sellers can also buy Royal Mail, Evri, DPD, Yodel and GlobalPost labels inside FLUF Connect and pay per label by card. This only works from a UK sender address. US sellers should use Pirate Ship or the labels their marketplace provides.

What Is the Best Bookkeeping App for Resellers?

Resellers need two numbers that general accounting apps don’t track well: what each item cost you, and what it made after fees and postage. Reseller-specific apps start from those numbers. My Reseller Genie costs $11.99 to $22.99 a month and connects to eBay, Poshmark, Mercari, Whatnot, Etsy, Depop and Vinted. Flipwise is free for up to 24 listings and suits eBay sellers in the US, UK and ten other eBay countries.

For full accounts and tax returns, the general apps take over. QuickBooks Simple Start is $38 a month in the US. Xero starts at £18 a month in the UK and $27 in the US. FreeAgent costs £19 a month for a UK sole trader, or nothing if you bank with NatWest, RBS, Ulster Bank or Mettle.

FLUF Connect records an item’s cost and shows profit on every plan. On Pro and above it sends your sales to Xero, QuickBooks Online, Sage or FreeAgent, so you don’t key them in again.

Tax Rules Resellers Should Know in 2026

• US: a marketplace sends you a Form 1099-K only if you received over $20,000 from more than 200 sales on that marketplace. The 2025 law brought this back and dropped the $600 rule. Profit is still taxable without a form, and some states set lower limits.
• UK: marketplaces report you to HMRC unless you made fewer than 30 sales and received about £1,700 or less in the year. Being reported doesn’t mean you owe tax. Selling your own used things at less than you paid isn’t trading.
• UK trading allowance: the first £1,000 a year of trading income is tax-free. Above that, register for Self Assessment. You claim the allowance or your expenses, not both.

How Do Resellers Track Inventory?

Most start with a Google Sheet: one row per item with its cost, storage location and where it’s listed. That works until the same item is listed on several marketplaces and the sheet stops matching reality. Inventory apps such as Sortly are free for up to 100 items. A thermal label printer such as the Rollo, from $199.99, prints shipping labels and bin labels.

In FLUF Connect each item has one record, whichever marketplaces it’s listed on. The dashboard shows sales, profit and sell-through across them all, with 90 days of history on Starter and your full history on Pro.

How Do You Automate a Resale Business?

Automate the jobs you repeat for every item, in this order:

1. Delisting after a sale. This stops you selling an item twice, and a crosslister with sale sync does it for you.
2. Listing drafts. AI drafts from photos cut typing. You still check each one before it goes live.
3. Price drops and relisting. Set rules once, such as 10% off after 30 days down to a floor, instead of editing items one by one.
4. Bookkeeping. Send sales to your accounting app automatically, so tax season is a check, not a rebuild.

Be careful with bots that act like a person on your account. Poshmark’s community guidelines don’t allow unauthorised programs to like, share, follow or unfollow, or to delete and repost listings. Vinted’s terms ban bots and scraping tools that Vinted hasn’t authorised. Breaking these rules can get an account restricted, so read them before you switch anything on.

What Does a Reseller Software Stack Cost? Two Examples

A US part-time seller on Poshmark, Mercari and eBay could run on: eBay Product Research and Snapseed (free), Pirate Ship for eBay labels (free), Flyp’s crosslister at $9 a month, and My Reseller Genie Basic at $11.99. That’s $20.99 a month in software, with Poshmark and Mercari providing their own labels.

A UK seller on Vinted, eBay and Depop could run on: eBay Product Research and Snapseed (free), Click & Drop for eBay parcels (free), FreeAgent (free with a NatWest, RBS, Ulster Bank or Mettle account), and FLUF Connect for crosslisting, sale sync and repricing. The other four are free; FLUF Connect’s prices are below.

What Does FLUF Connect Cost?

Every plan includes unlimited listings and marketplaces, crosslisting, sale sync and profit tracking. Automation and accounting exports come with Pro and above. Prices show in your currency.

Automatic relisting, offer management, smart pricing and listing boosts are included from Pro upwards. Starter covers unlimited crosslisting, inventory sync, order sync and Instagram posting without them. Accounting integrations are included from Pro upwards. Yearly billing is charged once a year. New accounts get 7 days for £1, then move onto a plan.

Selling in South Africa? See reseller tools in South Africa for local couriers, payment links and SARS rules. Depop sellers can start with Depop seller tools.