Use the Live Monitor
See how to share an auction on a computer or use your phone's rear camera, then read one card or the next five.
CompGenies
Real eBay sold comps · Live auctions & collectionsKnow what every card isactually worth — live or in your vault.
Use the Live Monitor in your browser on a computer or with your phone's rear camera. Read cards as they appear, see their value, then save and manage your whole collection.
Free plan, no card Works in your browser Never bids for you
Watch how it works
Start using both tools in minutes
Watch the narrated videos for the Live Monitor and Collection manager.
47 seconds
Build and manage your Collection
Add a card photo, check its details, record your cost, and follow its value and profit.
Computer screen sharing Phone rear camera Collection management
Two ways to stop guessing prices
Pick the tool that fits what you're doing right now. Both use the same real eBay sold comps.
Live MonitorLive auction comps
Reads the card on your Whatnot, eBay Live, or TikTok Live stream and shows the median sold price, recent sales, and full range before the hammer drops.
- Comps in under a second
- Auto-detects the next lot
- Sports cards, TCG, and everything else
Collection trackerTrack your card collection
Upload photos of your cards. CompGenies names each one, prices it from sold comps, and tracks your portfolio value and P&L with live graphs.
- Snap a photo, get the card
- Value graphs over time
- Buy price vs. sale price P&L
Free trial included — no card needed
How to use the Live Monitor
Works on your computer and on your phone
On a computer you share the tab your auction is playing in. On a phone you point the rear camera at the stream — or at real cards in front of you. Same reading, same sold prices.
On a computer
Best for watching a live auction and bidding at the same time. Chrome, Edge, Brave, Arc or Safari.
- 1Open Whatnot, eBay Live or TikTok Live in another tab or window.
- 2Come back to CompGenies and press “Use it on your computer”.
- 3Choose the tab or window your auction is playing in.
- 4Every card held up in the middle of the stream is read and priced — no extension needed.
On a phone (rear camera)
Best for streams playing on a TV or second screen, and for comping cards in person at a show or shop.
- 1Open CompGenies in Safari or Chrome on your iPhone or Android phone.
- 2Press “Use it on your phone” and allow the camera when asked.
- 3Point the rear camera at the stream playing on your TV, laptop or tablet — or straight at cards in your hand.
- 4Press “Read next card”, or “Read next 5 cards” to work through a stack.
Phones can't record their own screen, so watch the auction on another screen and let the camera read it.
How to use the Collection tracker
Photo to portfolio in four steps
Tap through the walkthrough to see exactly what happens after you add a card — on your phone or on your computer.
1 · Add a card photo
On your phone, tap Add card and take a picture of the front of the card. On a computer, drop in a photo you already have. Raw cards and graded slabs both work.
Photo addedfront.jpg
Reading the card2–4 seconds
Live onWhatnoteBay LiveTikTok Live
A live auction gives you 20 seconds to decide.
The seller holds the item up, the chat starts hyping, and the price climbs $5 at a time. By the time you've opened a new tab, typed the title into eBay, and switched the filter to Sold Items, the lot is gone — or you've paid 40% over what it's worth.
That's the whole problem. Not a lack of data — eBay has decades of it. A lack of time.
20s
Typical time a lot stays open
3 taps
To search sold comps by hand — if you're fast
40%
Overpay it takes one hyped chat to create
0
Comps most buyers actually check mid-stream
Everything you need to bid with a number in your head
CompGenies does one job and does it fast: turn the item on screen into real sold data.
Comps in under a second
Hit scan and the median sold price, range, and latest sales land on screen before the bidding heats up.
Any category, not just cards
Watches, sneakers, comics, toys, tools, vintage clothing — if it sold on eBay, CompGenies finds it.
Auto-detect new items
Pro watches the stream for the next lot and pulls fresh comps the moment the item changes.
Know your walk-away number
A hard price range keeps you from chasing a $180 item to $260 because the chat got loud.
Scan history
Every lot you scanned, saved with the comp data — review what you won and what you dodged.
Stays out of the way
A small draggable panel you can collapse. No autoplay noise, no bidding on your behalf, ever.
Real screens, real sports card comps
The live overlay, your portfolio dashboard and the per-card comps report — pulled straight from eBay sold listings.
Live overlay on the stream
Median sold, low→high range and recent sales for the card on screen.
Portfolio dashboard
Market value over time, cost basis, realized and unrealized P&L, biggest movers.
Card comps report
Median comp, spread, sale count and P&L for every card, with the eBay sold link.
LiveWhatnot
CompGenies auto
Detected item
2018 Panini Prizm Luka Doncic #280 RC · PSA 10
Median sold
$812
Range
$725 – $950
- $812.00Best offer acceptedAug 24
- $795.00AuctionAug 22
Scan itemeBay
The overlay, on the stream, where you're already looking
Median sold price
The single number that tells you whether the current bid is a deal.
Recent sales with dates
Because a comp from 2021 is not a comp. Freshness is shown per sale.
Full eBay sold search, one click
Want to dig in? Open the exact filtered search in a new tab.
New — free with your account
Track your collection like a portfolio
Upload cards from your phone or desktop. CompGenies names each card, prices it from sold comps, and keeps a running P&L so you always know what your collection is worth.
Snap a photo, get the card
The same vision engine that reads live streams identifies player, year, set, number, parallel, and grade from a single photo.
Real-time market value
Every card is priced against fresh eBay sold comps — median, low, high, and how many sales back it up.
Portfolio dashboard
See total cost basis, current market value, realized profit, and your top cards at a glance.
Track buys and sales
Log purchase price, sale price, and dates so you know exactly what you made — and what you're holding.
247
Cards held
$8,420
Cost basis
$12,180
Market value
$1,340
Realized profit
Portfolio value over time
2018 Prizm Luka Doncic #280 PSA 10$600.50
2003 Topps Chrome LeBron James RC$1,240.00
1986 Fleer Michael Jordan #57 PSA 8$3,100.00
What buyers say
Placeholder reviews — swap in real testimonials at launch.
"I used to screenshot items and search eBay on my phone while the lot was closing. Now the number is just there."
"Auto mode is the whole product for me. Comps refresh as the seller moves to the next lot and I never lose the stream."
"Paid for itself the first night. I passed on two lots that were going way over comps."
Simple pricing
Start with a free trial of everything. Go Pro when you're bidding often enough that unlimited and auto-detect pay for themselves in one lot.
Free
Try everything free, then keep a daily check on the item that matters.
$0/ month
Free forever, no card required
- Free trial with every Pro feature
- 1 scan per day after the trial
- Manual Scan Item button
- Median sold price + price range
- 3 most recent sales
- Whatnot, eBay Live & TikTok Live
- Auto-detect mode
- Scan history
- Priority support
Most popular
Pro
For people bidding every night, not every month.
$9/ month
Billed monthly, cancel anytime
- Unlimited scans
- Auto-detect mode — comps appear on their own
- Full recent sales feed with dates
- Scan history across sessions
- Sold-through rate & price trend
- Priority support
Your next lot is 20 seconds long.
Open the Live Monitor and walk into it knowing what the card is worth.