None of the car-buying sites we track charge you to get an offer, and none of them bind you to it. That makes comparison shopping the one lever every seller controls: the same car, entered on five sites in an afternoon, gets five numbers you can hold side by side. What matters is how long each number lasts, what you hand over to get it, and whether any site pays you more for the legwork. Here is what each site states.
Which offers you can hold at the same time
| Service | Offer window (as stated on site) | What it takes to get the number |
|---|---|---|
| Carvana | 7 days | Real offer in 2 minutes |
| CarMax | 7 days | Offer in minutes by license plate or VIN |
| AutoNation | 7 days or 500 miles, whichever comes first | Online appraisal |
| EchoPark | 7 days or 500 miles, plus $500 extra if you sell within 48 hours | Online instant offer |
| Peddle | 7 days to accept and schedule pickup | Instant offer, no account required |
| webuyanycar.com | 7-day offer option | Free instant valuation |
| Cars.com | 3 business days | Instant offer from a local dealer |
| GiveMeTheVin | 12 hours | Plate or VIN, offer in 60 seconds |
| CarBuyerUSA | Not stated | Price in 20 seconds or less, no personal information required |
| Kelley Blue Book ICO | Not stated on the sell page | Free, no-obligation offer showing what dealers will pay |
Seven of these windows overlap comfortably, so the order you collect them in only matters at the short end. GiveMeTheVin's bids are good for 12 hours, and Cars.com's dealer offer for 3 business days, so get the week-long offers first and the short ones last. Two sites show a number before you commit anything: Peddle asks for no account, and CarBuyerUSA says it shows a price with no personal information required, though it also states that onscreen offers appear only 94% of the time, with some junk vehicles referred elsewhere.
The sites that pay you for comparing
Only one buyer we track ties its price to a competitor's. GiveMeTheVin's guarantee is that it will beat CarMax and Carvana, 'or we'll mail you a $100 check', which is only useful if you already have those two numbers in hand when you ask for its bid. EchoPark pulls in the opposite direction: its extra $500 applies if you sell within 48 hours of receiving the offer, after which the plain offer runs for 7 days or 500 miles. That bonus is real, but it is priced to stop you shopping, so the honest comparison is EchoPark's number plus $500 against the best of everything else you collected. Kelley Blue Book's Instant Cash Offer is the reference point rather than a buyer: it shows what participating dealers will pay and is redeemed in person at one of them, for cash or trade, and KBB itself never picks up the car or pays you.
Trackers and brokers that shop for you
If you are not selling this week, two of the big retailers will keep quoting you. Carvana's Value Tracker and CarMax's Offer Watch both monitor your car's value over time, which turns a one-off offer into a running price you can act on when it suits. Dealr, which is operated by the same team as PickMerit, takes the shopping off your hands entirely: it values the car in about 30 seconds, then its agent negotiates across hundreds of buyers, from dealers and national buyers to auction networks and private buyers, at $0 in fees. Its stated trade-off is speed: a typical sale completes in under 2 weeks, where instant-offer buyers pay same-day at pickup. Cars.com covers the other route, pairing its dealer offer with a free private listing on its marketplace, with no costs or hidden fees to selling the car yourself.
Why the highest number is not always the one you get
- webuyanycar.com states its valuations 'may be adjusted at our discretion at any time, including prior to or during our in-branch vehicle inspection'.
- GiveMeTheVin's bids are based on your description, and the affiliate dealer re-inspects the vehicle on arrival.
- Carvana's final payment happens at the appointment, after an inspection confirms the car matches the appraisal information.
- CarMax says most sellers qualify on their online details, but 'Some we'll ask to verify in-person'.
- At the firm end, Wheelzy states 'Your offer is always guaranteed', and Cash Auto Salvage says 'The number you see in the offer is what we pay', with no renegotiation at pickup.