Underpriced.App
Flip Smarter. Skip Faster.
4 followers
Flip Smarter. Skip Faster.
4 followers
Underpriced is a resale profit checker for thrift flippers. Snap a photo, scan a barcode or upload a listing screenshot to see an item's resale value, the selling fees and your profit before you buy. 5 free checks, no card.
Update, October 2026: Underpriced now runs on the web, iPhone, Android, Chrome and Firefox. You start with 5 free checks, no card. Paid plans are Reseller $9.99/month, Pro $14.99 and Ultra $24.99, and the first month is half price. A few feature names below have changed since January; current details are at www.underpriced.app
I'm the developer of Underpriced.app, a tool I built specifically for flippers and resellers who are tired of guessing if a deal is actually worth their time.
Every reseller has been there: You see something at a thrift store or on Facebook Marketplace, think "that might be worth something," but you're not sure. So you either pass and potentially miss out on $200 profit, or you buy and end up with another item that sits in your death pile for 6 months.
I built Underpriced to eliminate that uncertainty.
✨ Every Analysis Includes
• Deal Tier – HOT DEAL / GOOD DEAL / FAIR / PASS
• Deal Score (0-100) – Quantified deal quality
• AI Confidence % – How certain the AI is about its valuation
• Item Identification – Brand, model, era, key specs, authenticity markers
• Category Detection – Auto-detects category and applies specialized expertise (electronics, fashion, furniture, collectibles, watches, etc.)
• Market Value Range – Low/median/high based on real market data
• Personal Use Value – Savings vs. buying new/retail
• Flip Value – Profit, margin, demand, time to sell, best platforms
• Red Flags – Overpriced items, potential scams, authenticity concerns, missing information
• Things to Check – Category-specific inspection points before you buy
• Data Sources – See what data backed the valuation
🎯 What Makes This Different From "Just Googling It" or asking ChatGPT?
This isn't a price lookup. It's a flip-focused analysis engine that tells you:
• Exact profit potential – Not just market value, but YOUR profit after fees, shipping estimates, and your purchase price
• Profit margin % – Know instantly if it's a 20% flip or a 200% flip
• Demand level – Is this a quick flip or a slow burn? (High/Medium/Low)
• Time to sell estimate – Days, weeks, or months?
• Best platforms to sell on – eBay, Poshmark, Mercari, FB Marketplace – where will THIS item sell fastest and for the most?
• Deal Score (0-100) – Instant gut-check. 80+ = grab it. Under 40 = walk away.
One photo or screenshot, and you know if it's worth buying.
🔥 Two Ways to Use It
📱 Online Sourcing Mode
Browsing Facebook Marketplace, eBay, Craigslist, OfferUp, or any online listing? Screenshot it. Get instant analysis with:
• What it is (brand, model, year, specs)
• What it's actually worth
• Your profit if you flip it
• Red flags to watch for
• Platform-specific fee calculations
🏷️ In-Person Sourcing Mode
At a thrift store, garage sale, estate sale, or flea market? Snap a photo of the item and price tag. Get the same comprehensive analysis in seconds – while you're still standing there deciding.
No more "let me look this up" while someone else grabs it. No more buying blind and hoping.
🧩 Chrome Extension
Install the extension and analyze listings without leaving the page:
• One click on any eBay, Facebook Marketplace, Craigslist, OfferUp, Mercari, or Poshmark listing
• Results appear in a popup – no tab switching
• Select specific areas to analyze (great for multi-item listings)
• Same powerful analysis, faster workflow
📋 Flip Tracker – Your Reselling Command Center
A complete flip tracking system built into the app:
Track Every Flip
• Purchase details – What you paid, where you sourced it, date acquired
• Listing details – Where you listed, asking price, listing date
• Sale details – Final sale price, fees, shipping costs, profit
• Status tracking – Sourced → Listed → Sold
Real-Time Analytics
• Total profit across all flips
• Average ROI %
• Average days to sell
• Best performing categories
• Profit trends over time
Why This Matters
Most resellers track nothing or use messy spreadsheets. This gives you actual business intelligence:
• Know your true ROI (not what you think it is)
• Identify what categories make you the most money
• See how long inventory actually sits
• Make smarter sourcing decisions based on YOUR data
💎 Premium AI Tools (Reseller Tier+)
These are the features that turn casual flippers into serious resellers:
🧠 Deep Dive
One-click comprehensive market research:
• Price history and trends
• Cross-platform price comparison
• Authentication tips for your specific item
• Detailed condition impact on value
• Expert-level verdict
💬 Negotiator
AI-generated negotiation strategy:
• Leverage points specific to the listing
• Target price recommendation
• Copy-paste messages ready to send the seller
• Counter-offer scripts
• Walk-away price
📈 Plan My Flip
Complete listing generator:
• SEO-optimized titles
• Professional descriptions (copy-paste ready)
• Pricing strategy with minimum/target/aspirational prices
• Photo tips specific to your item
• Platform-specific recommendations
• Shipping suggestions
📊 eBay Comps (Beta)
Real sold listing data pulled directly from eBay:
• Actual recent sale prices (not asking prices)
• Median, low, and high sale prices
• Condition-based price breakdown
• Sample size and data quality indicators
• Verifies AI estimates with real market data
🚀 Try It Free
5 free checks to start, no card needed. Paid plans from $9.99/month, and the first month is half price.
→ underpriced.app
Happy flipping 🤝