Simoledger is a value ledger for homes. For each metro we rank the 100 most under-priced active listings — to buy and to rent — by how far each one sits below its own comparables. No teasers, no sponsored placements inside the rankings, and every figure traces back to a live listing.

Each listing is compared against the median of its own comparables among live listings. Buying: the all-in monthly cost — 20.0% down, 6.49% fixed rate (2026-07-09, Freddie Mac PMMS), 30-year term, HOA included, tax & insurance excluded — per square foot, measured against the same zip, property type and size class. Renting: the rent itself, measured against the same zip, property type and bedroom count. When a zip has too few comparables, the comparison falls back to metro-wide pools of the same size or bedroom class — and each row shows how many comparables its figure rests on.

Active sale and rental listings via the RentCast API, pulled zip by zip across each metro's central counties — the counties the OMB classifies as the core of the metropolitan area. Mortgage rates come from the Freddie Mac Primary Mortgage Market Survey via FRED and are refreshed with each data update. We compute every benchmark from the listings themselves rather than from third-party aggregates, so any number on the site can be traced to listings we actually hold.

We omit rather than guess. Listings with implausible source data (a unit listing carrying its whole building's square footage, price typos), listings more than 120 days on market, and "discounts" so deep they can only be data errors are all left out of the ranking. A listing also needs enough comparables — at least six — for its figure to mean anything.