15 Essential Reselling Apps & Tools Every Beginner Needs in 2026

The difference between resellers who burn out after two months and resellers who build $3,000+/month operations usually isn’t hustle or luck. It’s tools.

The right app stack saves you 5-10 hours per week on tasks like pricing research, listing creation, shipping label purchases, and bookkeeping. The wrong stack—or no stack at all—means you’re manually checking prices on your phone, overpaying for shipping, and scrambling to figure out taxes in April.

This guide covers the 15 essential apps and tools every beginner reseller needs in 2026. For each one, you’ll learn exactly what it does, what it costs, how beginner-friendly it is, and real pro tips to get the most out of it. At the end, you’ll find a complete “starter stack” recommendation for both a $0 budget and a $50/month budget.

Whether you’re flipping thrift store finds on eBay, selling vintage clothing on Poshmark, or moving electronics on Facebook Marketplace, these are the tools that give you a competitive edge from day one.

New to reselling? Start with our ultimate beginner’s guide first, then come back to set up your tool stack.

Selling Platforms: Where You List Your Items

These are the apps where you actually sell. Every reseller needs at least one—most successful sellers use two or three.

1. eBay

What it does: The largest online marketplace for resellers, with 135+ million active buyers worldwide. You can sell literally anything—clothing, electronics, collectibles, vintage items, auto parts, books, and more. eBay’s auction and fixed-price formats give you flexibility on pricing.

Cost: Free to open an account. 250 free listings per month. Final value fees of 13.25% on most categories (including shipping). Optional store subscription starts at $21.95/month for 1,000 free listings.

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• Enable Seller Hub immediately (sellerhub.ebay.com) for analytics and traffic data
• Start with “Buy It Now” fixed-price listings rather than auctions—you control the price
• Offer free shipping and bake the cost into your item price (listings with free shipping rank higher in search)
• Use eBay’s shipped-with-label option for discounted USPS, UPS, and FedEx rates

When calculating whether eBay is the right platform, use our Platform Fee Calculator to see exactly what you’ll net after all fees. For a complete walkthrough, see our eBay selling guide for beginners.

2. Mercari

What it does: A mobile-first selling app that’s become massively popular for casual resellers. Simpler listing process than eBay, with a flat fee structure. Great for clothing, home goods, electronics, toys, and general merchandise.

Cost: Free to list. 10% selling fee + 2.9% + $0.50 payment processing on each sale. Shipping labels available through the app at discounted rates, or you can ship on your own.

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• Take advantage of Mercari’s promoted listings (5-10% of the sale price) to boost visibility on slow-moving items
• Be aggressive with pricing—Mercari buyers love deals, and most will make offers 15-30% below asking
• Use the prepaid shipping labels for simplicity, but compare costs using our First Class vs Priority Calculator to ensure you’re choosing the cheapest option
• Relist items that haven’t sold in 30 days—fresh listings get a search boost

3. Poshmark

What it does: The go-to platform for clothing, shoes, and accessories. Poshmark’s social-commerce model encourages community engagement (sharing, following, parties) that drives sales. The platform handles shipping with a flat-rate prepaid label.

Cost: Free to list. Commission: 20% on sales over $15, flat $2.95 on sales under $15. Includes a prepaid USPS Priority Mail shipping label (up to 5 lbs).

Beginner Rating: ⭐⭐⭐⭐

Pro tips for beginners:

• Share your closet at least once a day—Poshmark’s algorithm rewards active sellers with higher search visibility
• Share other people’s listings too (community shares lead to reciprocal traffic)
• Price 20-30% higher than your target to account for the “offer” culture—nearly every Poshmark buyer will send an offer
• Lululemon, Nike, Free People, and Anthropologie are the bread-and-butter brands on this platform

Deep dive into Poshmark strategy: How to Sell on Poshmark: Complete Guide.

4. Facebook Marketplace

What it does: The largest local selling platform in the US. Ideal for heavy, bulky, or fragile items that are expensive or risky to ship. Zero fees for local pickup transactions. Also supports shipped listings with seller fees.

Cost: Free for local pickup sales (no fees at all). Shipped items: 5% selling fee (minimum $0.40). No monthly subscription required.

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• Meet in public places for all transactions (police station parking lots are ideal)
• Respond to messages within 1 hour during peak times (evenings, weekends) to grab serious buyers
• Price 15-20% above your target to leave room for negotiation—everyone on Facebook Marketplace expects to haggle
• Use our Negotiation Range Calculator to determine your walk-away price upfront so you never accept a bad deal in the moment

Read our complete Facebook Marketplace selling guide for strategies that actually work.

Price Research: Know What Things Are Worth

Price research is the skill that separates profitable resellers from people who lose money. These tools tell you what items actually sell for—not what people ask for (two very different numbers).

5. Underpriced App

What it does: AI-powered deal analysis that tells you instantly whether an item is worth flipping. Snap a photo or enter item details and get estimated resale value, best platform to sell on, comparable sales data, and a clear “flip or skip” recommendation. Think of it as a knowledgeable reselling mentor in your pocket.

Cost: Free (10 AI deal analyses included). Paid plans start at $9.99/month for unlimited analyses.

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• Use Underpriced while you’re at the thrift store or garage sale—don’t buy blind and research at home
• Take advantage of the free tools library: Flip Profit Calculator, ROI Calculator, and Platform Fee Comparison are all free to use anytime
• The AI analysis is most valuable for items you’re unsure about—don’t waste analyses on items you already know are profitable
• Combine Underpriced’s AI with eBay sold comps (below) for the most complete pricing picture

6. eBay Sold Listings (Built-In)

What it does: eBay’s completed/sold listings filter shows you exactly what items have actually sold for in the past 90 days. This is the single most important free research tool for any reseller. Search for your item, click “Sold Items” under the filter options, and you see real transaction prices.

Cost: Completely free. Built into the eBay app and website.

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• Always filter by “Sold Items”—active listings show asking prices, not selling prices. A $100 asking price means nothing if every sold listing is at $40
• Search using the specific model number or descriptive keywords (brand + model + condition)
• Look at the most recent 10-15 sold listings to get an average, not just one outlier sale
• Sort by “Price + Shipping: highest first” to see the ceiling, then “lowest first” to see the floor—price your items in the middle-to-upper range

Learn the full methodology in our eBay sold listings pricing guide.

7. WorthPoint

What it does: A massive database of sold prices from eBay, auction houses, and other platforms going back 20+ years. WorthPoint is most valuable for vintage items, antiques, collectibles, and unique items where current eBay sold data might not show enough comparables.

Cost: $29.99/month (7-day free trial available). Also offers a “Worthopedia” with 700+ million historical prices.

Beginner Rating: ⭐⭐⭐

Pro tips for beginners:

• Don’t subscribe immediately. eBay sold listings and Underpriced’s AI are enough for 90% of beginners. Add WorthPoint once you’re regularly sourcing vintage, antiques, or rare collectibles.
• Use the 7-day free trial strategically—save up a list of items you need to research, then batch-research them during your trial period
• WorthPoint’s mark identification tool is extremely useful for pottery, silver, and porcelain

Listing Tools: Create Better Listings Faster

Better listings sell faster and for more money. These tools help you create professional listings in minutes instead of spending 20+ minutes on each one.

8. Crosslisting Apps (Vendoo, List Perfectly)

What they do: Create a listing once, then push it to multiple selling platforms simultaneously. Instead of manually creating separate listings on eBay, Mercari, Poshmark, and Facebook Marketplace, you create one listing and crosslist it everywhere with a few clicks. This multiplies your exposure and dramatically speeds up sell-through.

Cost:

• Vendoo: Free for 25 crosslists/month. Plans from $6.99/month (100 listings) to $34.99/month (unlimited)
• List Perfectly: Plans from $29/month (Simple) to $69/month (Business)

Beginner Rating: ⭐⭐⭐⭐

Pro tips for beginners:

• Start with Vendoo’s free plan (25 listings/month) to test crosslisting before paying for a subscription
• Crosslisting to just 2 platforms increases your chance of selling by 60-80%
• Always adjust titles and descriptions slightly for each platform—what works on eBay (keyword-stuffed titles) doesn’t work on Poshmark (cleaner brand-focused titles)
• Use our Crosslisting Platforms Comparison tool to decide which platforms to crosslist to for each category

Our full crosslisting guide for resellers breaks down the complete crosslisting strategy.

9. Photo Background Removers (PhotoRoom, Remove.bg)

What they do: Instantly remove the background from product photos and replace it with a clean white or colored backdrop. Professional-looking photos sell items 30-40% faster than cluttered background shots. These apps use AI to automatically detect the item and erase everything behind it.

Cost:

• PhotoRoom: Free (with watermark). Pro plan $9.99/month (no watermark, batch editing)
• Remove.bg: Free (low resolution). High-resolution credits from $9/month

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• PhotoRoom is the better choice for beginners—its free tier is more generous, and its auto-cutout is more accurate for most items
• Keep a consistent background across all your listings for a professional store appearance—white backgrounds work best on eBay, lifestyle backgrounds work better on Poshmark and Depop
• For clothing, use a dress form or flat lay before removing the background—items photographed on hangers sell worse
• Read our product photography guide for complete tips on taking photos that sell

10. Listing Title Optimizer

What it does: Optimizes your listing titles with the right keywords to maximize search visibility. Our free Listing Title Optimizer analyzes your title and suggests improvements based on what buyers actually search for on each platform.

Cost: Free (Underpriced tool).

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• eBay titles can be up to 80 characters—use all 80. Every unused character is a missed keyword opportunity
• Include brand, model, size, color, condition, and key features in your title
• Skip filler words like “WOW,” “LOOK,” “L@@K,” and “AMAZING DEAL”—they waste character space and don’t match search queries
• Use the optimizer before your first 20-30 listings until you develop an instinct for strong titles

Read our complete guide to writing listings that sell for description templates and formatting strategies.

Shipping Tools: Save Money on Every Package

Shipping is where many beginners hemorrhage profit. The difference between overpaying for shipping and using the right tools often amounts to $2-$5 per package—which adds up to hundreds of dollars per month.

11. Pirate Ship

What it does: A free shipping label platform that gives you USPS Commercial Plus pricing (the cheapest USPS rates available—normally reserved for high-volume shippers). Also offers UPS and GlobalPost rates. You print labels from your computer, no special equipment needed.

Cost: Completely free. No monthly subscription. No markup on postage. You only pay the actual shipping cost.

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• Pirate Ship’s “Simple Export Rate” for international packages is dramatically cheaper than standard international shipping—often 40-60% less
• The “Simple Rates” feature for domestic USPS Priority Mail gives you flat pricing regardless of destination zone—perfect for offering free shipping
• Connect your eBay store directly to import orders and print labels in batches
• Use Pirate Ship for packages NOT shipped through the platform’s built-in label system (compare costs—sometimes Pirate Ship is cheaper, sometimes the platform’s rate wins)

Compare shipping options beforehand with our First Class vs. Priority Calculator and Shipping Box Size Calculator.

Our complete shipping guide for resellers covers every carrier, service level, and money-saving trick.

12. USPS Mobile App + Informed Delivery

What it does: The USPS app lets you schedule free package pickups (a carrier comes to your door—no trip to the post office), track shipments, and find drop-off locations. Informed Delivery shows you scans of incoming mail, so you know when returns or supplies orders are arriving.

Cost: Completely free.

Beginner Rating: ⭐⭐⭐⭐⭐

Pro tips for beginners:

• Schedule pickups the night before for next-day carrier pickup—leave packages by your mailbox or door
• You can combine personal pickups with your reselling packages—no minimum volume required
• If you’re shipping 5+ packages daily, pickups save you 30-45 minutes per day vs. post office trips
• Use the app’s price calculator to double-check weights/dimensions before printing labels

Bookkeeping & Taxes: Track Your Money

Ignoring bookkeeping is the #1 regret experienced resellers report. When tax time comes (and with the $600 1099-K reporting threshold, it comes for almost everyone), not having records is a nightmare.

13. Spreadsheet Tracking (Google Sheets / Excel)

What it does: A simple spreadsheet is still the most flexible and cost-effective way for beginners to track inventory, sales, expenses, and profit. You don’t need expensive software at the start—a well-organized spreadsheet handles everything.

Cost: Free (Google Sheets) or included with Microsoft 365.

Beginner Rating: ⭐⭐⭐⭐⭐

What to track in your spreadsheet:

Pro tips for beginners:

• Start your spreadsheet from day one—don’t plan to “catch up later” (you won’t)
• Add a column for “Mileage” to track trips to thrift stores, post office, and sourcing locations—this is tax deductible at $0.70/mile in 2026
• Use conditional formatting to color-code: green for sold items, yellow for listed, red for items in your death pile
• Use our Reseller Tax Deduction Calculator alongside your spreadsheet to estimate your tax liability throughout the year

Our bookkeeping basics guide for resellers includes downloadable templates to get started.

14. Wave Accounting

What it does: Free accounting software that handles invoicing, expense tracking, receipt scanning, and basic financial reports. More structured than a spreadsheet but doesn’t cost anything. Ideal for resellers doing $500+/month in sales who want clean records for taxes.

Cost: Free for accounting, invoicing, and receipt scanning. Payment processing: 2.9% + $0.60 per credit card transaction.

Beginner Rating: ⭐⭐⭐⭐

Pro tips for beginners:

• Don’t switch to Wave on day one—use a spreadsheet for your first 30-60 days, then migrate once you have consistent sales volume
• Connect your bank account and credit card for automatic transaction importing
• Use the receipt scanning feature—photograph every thrift store receipt, shipping receipt, and supply purchase
• Generate a “Profit & Loss” report quarterly to see your actual business performance
• Learn more about reseller tax obligations in our complete tax deductions guide

Inventory & Workflow: Stay Organized

As your operation grows from 10 items to 50 to 200+, organization becomes critical. These tools prevent the “death pile” and keep your workflow efficient.

15. Inventory Management System

What it does: Tracks every item in your inventory—where it’s listed, how long it’s been listed, what you paid, and whether it’s sold. For beginners, this can be as simple as a spreadsheet (see #13 above) or a dedicated app. Dedicated options include Vendoo’s built-in inventory (if you’re already crosslisting), SellerToolkit, and the basic tracking in each selling platform’s seller dashboard.

Cost: Free (using spreadsheets or platform dashboards). Dedicated apps: $5-$30/month.

Beginner Rating: ⭐⭐⭐⭐

Pro tips for beginners:

• Label every item with a simple SKU system: YourInitials-MonthYear-Number (e.g., “JD-0226-001”). Write it on the item’s tag or attach a sticker. This lets you quickly find items when they sell
• Track your days to sell metric—this tells you which categories are moving fast and which are dead weight
• Use our Inventory Turnover Calculator to measure how efficiently your inventory is converting to cash
• Read our guide to avoiding the death pile once you have 30+ unsold items—it’s the most common trap for growing resellers

The Beginner Starter Stack: Your Complete Setup

Not sure which tools to start with? Here are two complete setups based on your budget.

The $0/Month Starter Stack (Everything Free)

This setup costs you nothing and covers every essential:

This stack handles everything a beginner needs for their first 1-3 months. You can source, research, photograph, list, ship, and track without spending a dime on tools. Every dollar goes into inventory.

💡 Pro Tip: Start here even if you have a budget. Don’t pay for tools until you understand what you actually need. Most beginners waste money on subscriptions they barely use.

The $50/Month Power Stack (Growth Mode)

Once you’re making consistent sales and want to scale:

This stack is designed for resellers doing $500-$2,000+/month in sales. The eBay store subscription pays for itself with the insertion fee savings once you’re listing 250+ items. Vendoo’s crosslisting saves you 3-5 hours per week. Underpriced’s unlimited analyses mean you never have to guess whether a deal is worth it.

ROI on this stack: If these tools help you source just 5 additional profitable items per month (conservatively averaging $15 net profit each), they pay for themselves twice over. Most resellers report far higher returns.

Tools You Don’t Need Yet (But Will Later)

Some tools are unnecessary for beginners but become valuable as you scale. Don’t invest in these until you’re consistently doing $1,000+/month:

WorthPoint ($29.99/month): Only necessary once you’re regularly sourcing vintage, antiques, or rare collectibles where eBay sold comps aren’t sufficient.

Paid analytics tools: eBay Seller Hub and platform dashboards provide enough data for beginners. Advanced tools like Terapeak (included with eBay stores) add value once you’re doing 100+ sales per month.

Barcode scanning apps (ScoutIQ, etc.): Primarily useful for book and media resellers doing retail arbitrage at high volume. Not needed for general reselling.

Paid photo editing suites (Lightroom, etc.): A smartphone camera and PhotoRoom are more than sufficient. Buyers care about clear, well-lit photos—not professional post-processing.

Dedicated shipping stations (scales, thermal printers): A kitchen scale and standard printer work fine for your first 50-100 shipments. Graduate to a thermal label printer (Rollo or Phomemo—$100-$150 one-time cost) once you’re shipping 5+ packages daily.

How to Set Up Your Tool Stack in One Day

Here’s a step-by-step action plan to get fully equipped:

Morning (30 minutes)

1. Download the eBay app and create your seller account (enable Seller Hub)
2. Download the Mercari app and create your account
3. Download Facebook Marketplace (you already have it if you have Facebook)

Midday (20 minutes)

4. Create a Pirate Ship account at pirateship.com and connect your eBay store
5. Download the USPS Mobile app and set up Informed Delivery
6. Download PhotoRoom for product photos

Afternoon (30 minutes)

7. Create your tracking spreadsheet in Google Sheets (use the columns from the table above)
8. Bookmark the Underpriced free tools page — Flip Profit Calculator, Fee Calculator, ROI Calculator, and Listing Title Optimizer
9. Set up your first 3 listings using the tools you’ve just installed

Total setup time: Under 90 minutes. By the end of the day, you’ll have a complete reselling operation ready to go.

Free Tools You Should Bookmark Right Now

In addition to the major apps above, these free tools from Underpriced deserve a permanent spot in your browser bookmarks:

💡 Pro Tip: Open the Flip Profit Calculator on your phone before every sourcing trip. It takes 10 seconds to verify a deal is worth it—and saves you from bringing home items that lose money after fees and shipping.

Frequently Asked Questions

What is the best app for selling stuff in 2026?

eBay remains the best overall selling app due to its enormous buyer pool (135+ million active buyers), support for virtually every product category, and robust seller protections. For clothing specifically, Poshmark is excellent. For quick local sales, Facebook Marketplace can’t be beat. Most successful resellers use 2-3 platforms simultaneously. Use our Platform Fee Comparison tool to see which platform gives you the best take-home on each sale.

Do I need to pay for any apps to start reselling?

No. You can build a complete, functional reselling operation using only free tools. eBay, Mercari, and Facebook Marketplace are free to join. Pirate Ship provides the cheapest shipping labels for free. Google Sheets handles bookkeeping. PhotoRoom’s free tier works for product photos. The Underpriced app gives you 10 free AI deal analyses. Start free and only pay for tools once you understand what you need.

What’s the best app for checking resale prices?

For most items, eBay’s sold listings (filter by “Sold Items” in search) is the gold standard—free and comprehensive. The Underpriced app adds AI-powered analysis that gives you a flip-or-skip recommendation with estimated resale values. WorthPoint ($29.99/month) is best for vintage and antique items where you need deep historical pricing data. For 90% of beginners, eBay sold listings + Underpriced covers everything you need.

Is crosslisting worth it for beginners?

Yes, but start simple. Even manually crosslisting to just 2 platforms (e.g., eBay + Mercari) increases your exposure and sell-through rate by 60-80%. Use Vendoo’s free tier (25 crosslists/month) to test whether crosslisting automation saves you enough time to justify paying for it later. See our crosslisting guide for the full strategy.

What shipping app saves the most money?

Pirate Ship, hands down. It offers USPS Commercial Plus pricing (the cheapest available rates), has zero subscription fees, and adds zero markup to postage. The savings vs. retail USPS pricing are typically 15-40% per package. For example, a 1 lb First Class Package costs $4.50 at retail USPS but around $3.50-$4.00 through Pirate Ship. Over 50 packages per month, that saves you $25-$75.

How do I handle taxes as a reseller?

Track every sale, expense, and mileage from day one using a spreadsheet or Wave Accounting. In the US, reselling income is taxable. Platforms report sales over $600 to the IRS via Form 1099-K. However, you only pay taxes on your profit (sales minus cost of goods, fees, shipping, supplies, mileage, etc.)—not on total revenue. Many resellers find they owe much less than expected after deductions. Use our Tax Deduction Calculator to estimate your write-offs.

Do I need a thermal label printer?

Not as a beginner. A regular inkjet or laser printer works fine for shipping labels—just tape them to your packages. Once you’re shipping 5+ packages per day consistently, invest in a thermal label printer (Rollo or Phomemo, $100-$150). It saves you time, tape, and ink costs. But for your first 100 shipments, a home printer plus clear packing tape gets the job done.

What app do I need for product photos?

Your smartphone camera is all you need. iPhones and recent Android phones take photos that are more than good enough for reselling—84% of eBay’s top sellers use only smartphone photos. Use natural daylight (by a window), a clean background, and the PhotoRoom app to remove backgrounds. No professional camera, lighting kit, or photo studio required. See our product photography guide for the full setup.

How much time do these tools save per week?

Based on reseller surveys, the tool stack outlined in this guide saves 5-10 hours per week compared to doing everything manually. The biggest time-savers: crosslisting apps (2-4 hours saved on listing), Pirate Ship batch labels (1-2 hours saved on shipping), and background removers (1-2 hours saved on photo editing). Total investment to set up: under 90 minutes. Total time saved per month: 20-40 hours.

Which tool should I set up first?

Set up your selling platform (eBay or Facebook Marketplace) first—you can’t make money without somewhere to sell. Second, create your bookkeeping spreadsheet (5 minutes). Third, download PhotoRoom for photos. Fourth, create a Pirate Ship account for shipping. Everything else can wait until you’ve made your first sale.

Start Your Reselling Journey with the Right Tools

You don’t need dozens of apps, expensive subscriptions, or complicated software to make money reselling. You need a selling platform, a way to research prices, a method to ship, and a system to track your money.

The tools in this guide—most of them completely free—give you everything needed to run a profitable reselling operation from your phone and a kitchen table.

Here’s your immediate action plan:

1. Set up your free tool stack using the one-day plan above
2. Source 3-5 items from your closet, garage, or nearest thrift store
3. Run each item through the Flip Profit Calculator to verify profitability
4. List them tonight using the tips from this guide
5. Ship your first sale through Pirate Ship

Ready to make smarter buying decisions from your very first flip? Try the Underpriced app — get 10 free AI deal analyses to instantly find out if an item is worth reselling before you spend a dollar. No credit card. No commitment. Just data-backed confidence on every deal.

Every profitable reselling business started with a single listing. Make yours today.