A valuation you can check
Every large property portal will give you an estimate of your home's value and none of them will tell you how they arrived at it. The number appears, you have no idea what drove it, and when it disagrees with reality by twenty percent you have no way of working out which part was wrong.
This site takes the opposite position. It uses public federal data, states which method produced your figure, prints every step of the arithmetic, and says plainly what it does not know.
What it runs on
The Federal Housing Finance Agency house price index for 51 states and 410 metropolitan areas, currently to 2026Q1; live mortgage rates and median sale prices from the Federal Reserve Bank of St. Louis; and property tax rates from the Census Bureau. All of it is public, all of it is cited, and the exact workings are on the methodology page.
What it will not do
It will not invent an address-level valuation it cannot support. Comparable sales and parcel records are licensed data, we have not licensed them, and until we do the honest product is a market-level estimate applied to your own inputs, clearly labelled.
It will not inflate estimates to generate leads. That temptation is real, given how the site makes money, and the defence against it is that every figure is shown with its arithmetic so you can check it yourself.
Where it is going
The obvious next steps are licensed property records for address-level lookup, comparable sales, and neighbourhood-level rather than metro-level indices. Each of those is a data licence rather than a clever idea, and each will be described here when it lands.