About
Last updated July 2026
Why this exists
There are tools for finding a home and tools for financing one. The moment in between, deciding what your offer actually is, usually happens in a spreadsheet someone builds by hand the night before. Offer Buildr is that spreadsheet, built properly: the price, the monthly cost, the cash needed, the terms, and the tradeoffs, all in one place that shows its work.
Who builds it
Offer Buildr is built and operated by Momentum4 Holdings LLC, a Maine limited liability company. It started as the founder’s own hand-built deal spreadsheet, the one this tool replaces.
How it makes money
It doesn’t yet. Offer Buildr is free during beta. We do not sell leads or your personal information, and no one pays us to steer your number. If that changes in any way, this page and the privacy policy will say so plainly first.
Where the numbers come from
The math is standard mortgage arithmetic, computed live from your inputs; every default (rate, closing costs) is labeled and editable, and every total can be traced to its parts. Insurance stays blank and uncounted until you type a real quote. Address suggestions use OpenStreetMap data (via Photon). Public-record facts and zip-level market statistics come from RentCast, only when you ask for them. Usage is measured with Plausible, a cookieless analytics service. Nothing here is an appraisal, a quote, or advice; your agent and lender confirm the real figures.
Contact
Questions, corrections, and ideas: privacy@offerbuildr.com.