Know what cars are truly worth.

If you want to buy a classic Ferrari or a clean air-cooled Porsche, you are negotiating against people who do this every day. Dealers know what the last three sold for. Auction specialists know which configurations command premiums and which don’t. You, as a private buyer, are working from asking prices, gut feel, and whatever you can find on a forum.

AutoIndex exists to close that gap. We track advertised and achieved prices across the collector car market — by make, model, generation, and configuration — and surface that data in a way that’s genuinely useful when you’re standing in front of a car with a chequebook.

AutoIndex values 1,061 collector cars, from pre-war classics to modern supercars. Each value is researched from public UK sold prices and auction results, and re-checked every month against recent sales wherever there are enough to read; cars whose market is moving fast are re-checked every week. How we value cars.

We are transparent about what the data is during this stage. A value is for a good, usable UK car, with bands for project and concours condition; it is market information, not a valuation of a particular car. We don’t yet show price trends or forecasts: they will appear once we have enough dated sales to measure them rather than model them.

The direction is toward the kind of granularity that lets you look up what a specific configuration — say, a Guards Red 993 RS in Clubsport specification — has genuinely achieved at auction over the last 36 months. We’re not there yet. We’re building toward it.

AutoIndex is free to use as a research tool. You can explore the full catalogue, check any asking price, read our analysis and compare models without creating an account. A free account adds a watchlist, and a garage for the cars you own, with each car’s value by email every month.

For those who want to go deeper, the Collectors’ Guides (AutoIndex Editions) are long-form references written from the market’s point of view: production data, what each version is worth and why, and what it costs to own, model line by model line.12 are on sale, covering Ferrari, Porsche, Jaguar, BMW, Lamborghini, Aston Martin, Mercedes-Benz, fast Fords and the Japanese icons.

We’re a small team and we read every email. If you have a question about the data, a correction to suggest, or you’re interested in a data partnership or dealer integration, write to us at hello@auto-index.co.

We also post market insights, auction highlights, and guide previews on Instagram — @autoindexapp.