An instant rent-comparables report — 'what should I charge for this unit' — for individual landlords, priced under the pro tools.
“Market-tested” means a real shipped product or experiment measured the failure directly (a live user count, a dead auction, a documented shutdown). “Predicted” means the verdict is an evidence-based forecast from the receipts below, not a direct measurement.
Perennial 'how much should I rent this for' threads on landlord forums and BiggerPockets. The question recurs; the willingness to pay above free options did not survive scrutiny. Note: some observed forum demand showed astroturf patterns (same-day thread triplets), so weigh forum evidence in this vertical cautiously.
The free and cheap floors cover the entire use case: Zillow's Rent Zestimate is free, Rentometer starts around $19/month with free lookups, and RentCast sells an affordable API. Above that, 5+ recent rent-comp entrants launched into the same wedge with no visible traction — the classic many-entrants-no-leader pattern. Serious operators use MLS-derived comps, which are credential-gated behind per-board licensing you cannot hold as a solo developer. There is no tier between 'free is fine' and 'MLS or nothing' left to sell.
Demonstrated willingness to pay above the Zillow/Rentometer floor — for example, the free tools degrading or a documented buyer segment the incumbents refuse to serve. Absent that, entering means becoming the sixth small player under a free ceiling.
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