Instant Comps
In Your Browser

Pricing intelligence for live shoppers — instantly see sold data, smart offers, and cheaper listings across eBay, Facebook Marketplace, and Whatnot.

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Start browsing — comps appear automatically

How it works

1

Install & Sign Up Free

Add to Chrome, create a free account. No credit card needed.

2

Shop Like Normal

Browse eBay, Facebook Marketplace, or Whatnot — comps, offers, and deals appear automatically.

3

Never Overpay Again

Sold prices, smart offers, and cheaper alternatives — all instant, right on the listing.

★★★★★

"Saved me $200 on my first Whatnot stream. I was about to overbid on a PSA 10 Charizard — Comp Buddy showed me the real sold price in seconds."

— Jake M., Sports Card Reseller
★★★★★

"I flip on Facebook Marketplace daily. This extension pays for itself within the first hour of sourcing."

— Sarah T., Full-Time Flipper
10,000+

Items scanned by the community this week

★★★★★

"The Snip Tool is a game changer. I scan items from Discord drops, Instagram stories — anywhere. Nothing else does this."

— Marcus R., TCG Collector
$2.1M+

Total value scanned through Comp Buddy

★★★★★

"I stopped guessing on eBay offers. The Offer Assistant alone is worth the subscription."

— Chris D., eBay Seller
★★★★★

"My margins went up 30% since I started using this on Whatnot. I know exactly what to bid now."

— Devon L., Live Stream Buyer
3 Platforms

eBay · FB Marketplace · Whatnot — one extension

★★★★★

"Saved me $200 on my first Whatnot stream. I was about to overbid on a PSA 10 Charizard — Comp Buddy showed me the real sold price in seconds."

— Jake M., Sports Card Reseller
★★★★★

"I flip on Facebook Marketplace daily. This extension pays for itself within the first hour of sourcing."

— Sarah T., Full-Time Flipper
10,000+

Items scanned by the community this week

★★★★★

"The Snip Tool is a game changer. I scan items from Discord drops, Instagram stories — anywhere. Nothing else does this."

— Marcus R., TCG Collector
$2.1M+

Total value scanned through Comp Buddy

★★★★★

"I stopped guessing on eBay offers. The Offer Assistant alone is worth the subscription."

— Chris D., eBay Seller
★★★★★

"My margins went up 30% since I started using this on Whatnot. I know exactly what to bid now."

— Devon L., Live Stream Buyer
3 Platforms

eBay · FB Marketplace · Whatnot — one extension

Works across the top secondary marketplaces

ebay
Marketplace
Whatnot

Built for buyers, collectors, and resellers who want an edge

Real-Time Shopping Intelligence

See what the community is scanning, spot trending items early, and track market movement — all from the CompBuddy Dashboard.

Open Dashboard See Plans

Everything You Need to Buy Smarter

Six tools that work automatically across eBay, Facebook Marketplace, and Whatnot.

🔍

Check Comps on eBay

One-click access to recently sold comparable listings on any eBay item. See what it actually sold for — not what sellers are asking.

🎯

Offer Assistant

Get three smart offer suggestions (conservative, recommended, and lowball) based on real sold data — plus cheaper alternatives already listed.

🏪

Facebook Marketplace Scanner

Automatically compares Marketplace listings against eBay sold data — instantly spot underpriced items worth flipping. Free on every listing.

📡

Whatnot Live Scan

Scans items in real-time during Whatnot live streams. See eBay sold prices across grading tiers so you know exactly what to bid.

⌨️

Manual Search

Search any item by name directly from the extension popup or the live scanner panel. Free for all users — get eBay sold comps rendered instantly without leaving the page.

✂️

Snip Tool

Select any area on your screen to instantly identify an item with AI and pull eBay sold comps. Works anywhere — not just on supported sites. Activate with Alt+S or from the popup.

Live Shopping Is Exploding.
Most Buyers Aren't Ready.

Secondary market spend $227,400,000,000 /year and growing

Most buyers are still guessing. CompBuddy gives you real sold comps, AI valuations, and market intelligence — instantly — so you can move with confidence while everyone else is still Googling.

Built for Resellers

Whether you're flipping, collecting, or sourcing inventory — CompBuddy gives you the pricing edge that separates profit from overpaying.

  • ✓ Buy below market value
  • ✓ Make smarter offers backed by data
  • ✓ Source inventory faster than the competition

The difference between profit and overpaying is knowing the real value.

Simple, Transparent Pricing

Start free. Upgrade when you need more power.

Free

$0
Free forever — no credit card
  • Manual search from popup
  • eBay Check Comps
  • eBay Offer Assistant
  • Cheaper Alternatives
  • Facebook Marketplace comps
  • Recently sold links
  • 3 comps per search
  • Dashboard: 50 scans/mo
  • Dashboard: 24h community feed
  • Dashboard: 3 watchlist items
Get Started Free

Starter

$12.99/mo
200 AI scans / month
  • Full 12 comps per search
  • 200 AI scans / month
  • AI image recognition
  • AI precision on FB Marketplace
  • Whatnot live stream scanning
  • Snip Tool — scan anything on screen
  • eBay image search
  • Sold data + market values
  • Dashboard: 7-day community feed
  • Dashboard: 10 watchlist items
MOST POPULAR

Pro

$29.99/mo
600 AI scans / month
  • Full 12 comps per search
  • 600 AI scans / month
  • AI image recognition
  • AI precision on FB Marketplace
  • Whatnot live stream scanning
  • Snip Tool — scan anything on screen
  • eBay image search
  • Sold data + market values
  • Dashboard: 30-day community feed
  • Dashboard: 25 watchlist items
  • Dashboard: Smart recommendations
  • Priority support

Elite

$69.99/mo
1,500 AI scans / month
  • Full 12 comps per search
  • 1,500 AI scans / month
  • AI image recognition
  • AI precision on FB Marketplace
  • Whatnot live stream scanning
  • Snip Tool — scan anything on screen
  • eBay image search
  • Sold data + market values
  • Dashboard: 30-day community feed
  • Dashboard: Unlimited watchlist
  • Dashboard: Smart recommendations
  • Built for high-volume resellers
  • Priority support

Frequently Asked Questions

Comp Buddy is a free Chrome extension that gives you pricing intelligence across eBay, Facebook Marketplace, and Whatnot. It pulls eBay sold data so you can see what items are actually selling for — whether you're buying, selling, or looking for flips.
The free tier includes manual search, eBay Check Comps, Offer Assistant, cheaper alternatives, and Facebook Marketplace flip finding — with 3 active comps per search, no credit card required. Paid plans unlock the full 12 comps per search, AI-powered image scans for more precise results (great for bundles or vague titles), Whatnot live stream scanning, the Snip Tool for scanning anything on screen, eBay image search, sold data, and PriceCharting market values.
When you open a Marketplace listing, Comp Buddy detects the item and compares the asking price against eBay sold data — so you can instantly see if it's a good flip. Free users get title-based comps. Paid users get AI image scans that read the listing photo for more accurate results, especially on messy titles or bundles.
On eBay listings, the Offer Assistant calculates three offer tiers based on the asking price — 90% (conservative), 75% (sweet spot), and 50% (lowball). It also shows you recently sold comps and cheaper alternatives already listed so you can make an informed offer.
On Whatnot live streams, Comp Buddy scans the item on screen and pulls eBay sold prices across grading tiers (PSA 9, PSA 10, BGS, etc.) in real time — so you know exactly what to bid before the countdown hits zero.
Sports cards, Pokémon, trading cards, Funko Pops, video games, consoles, sneakers, electronics, vintage collectibles, and more. If it sells on the secondary market, Comp Buddy can pull comps for it.
Yes. We only access the listing data on the page you're viewing. We don't collect browsing history or personal data. Video frames from live scans are processed in memory and never stored. See our privacy policy for details.
Nope — eBay features (Check Comps, Offer Assistant, cheaper alternatives) work immediately with no account. Facebook Marketplace comps and manual search require a free sign-up. Whatnot live scanning, AI image scans, the Snip Tool, and full comp results require a paid plan starting at $12.99/month.

🚀 Coming soon: real-time deal alerts and undervalued listing feed

Instant Comps
In Your Browser

Stop guessing. Start saving. Free to install, free to use.

Add to Chrome