How RevFolio works, in plain words.

From completed auction sales of the same car on Bring a Trailer, Cars & Bids and Mecum. For each model RevFolio keeps every sold result, matches the ones closest to your car by generation, trim, gearbox and mileage, adjusts each for mileage and recency, and takes the middle. The figure is refreshed every Sunday.

The band inside which most matched sales landed after adjustment. A low-mileage or rarer example sells near the top, a high-mileage one near the bottom. When the sales of a model disagree too widely for one figure, we publish the range only and say so.

Each model is measured by hiding every sale in turn and valuing it from the ones before it. The share that lands within 20% of the real result, and the median miss, are shown on every model page. Where a model has too few sales to measure, the page says so instead of inventing a number.

Until you add your own photo, the app shows a representative photo of your car's generation, with the photographer credited. Add your own from the car's page in the app; it replaces the stock photo everywhere.

Every morning RevFolio reads Craigslist and Facebook Marketplace for manual-transmission enthusiast cars, prices each against what the same car sold for at auction, and keeps only the ones that clear the rules: clean title stated, mileage stated, at least 12% under the measured figure, and not so far under that it reads as a scam. Modified cars and pre-1980 Porsches are left out.

Every Clutch deal with the listing link the morning it lands (free accounts get the link a day later), every car in your garage valued and refreshed weekly, an unlimited watchlist, and alerts when a car like yours sells. Founding members pay $2.99 a month or $24.99 a year for good; after that it is $4.99 and $34.99.

A price alert on a watchlist car tells you when the measured value moves by the percentage you set, when a comparable sells, or when a new auction opens. Clutch alerts tell you when a pick lands on a car you watch. Pushes go to the app; emails go to the address on your account.

On the web, open your account panel and choose Manage subscription; it opens Stripe's portal where you can change plan, update the card, cancel, and download invoices. If you subscribed in the iPhone app, manage it in Settings, your Apple ID, Subscriptions.

A two-page document for one car: the figure, the likely range, and every matched sale with the adjustment applied to each. It is for a buyer, seller, insurer or lender who needs the number on paper. Members do not need it for their own cars; the app already shows the same figure.

In the account panel on the web, under Account actions. It removes your garage, watchlist and profile. Subscriptions must be cancelled first.

Rarity runs 0 to 100 and says how few of a car were built, from production figures. 75 and up is rare, 55 to 74 limited, below 35 common. It does not change the valuation; it is context next to the figure.

0 to 100, in five parts: the asking price against the measured figure, mileage for the age, how the ad reads, how fresh the listing is, and whether it has photos. A higher score means more of those point the right way.

The average of the recent completed sales in that segment. Within 12% of it counts as near the average. A sale more than 50% off the average is a different variant (a GT3 next to 911s), not a bargain or a premium, and Radar says so.

One point per month: the median of the sales the module matched to that car over the trailing six months, from the month after purchase to today. The last point is the current measured value.

Where we expect the car to close after negotiation, as a negotiation estimate from the age of the listing and any price drops, not a measured probability. A pick clears the bar when the asking price is at least 12% under the measured figure; the target can sit below the asking price.

Some books do not yet have enough spread of sales to state a likely range, so the module gives a point only. The range appears as the book grows.

Email hello@revfolio.ai. The address is read by the founder.