ohm — open house, measured
ohm is an open-house sign-in and measurement tool by sum28, a california real-estate technology company. a thirty-second sign-in becomes a seller's report — attendance, interest, follow-through — so the open house is finally accountable to the person it is held for. sign-in is consent-first, in five languages.
what is ohm?
an open house produces work, foot traffic, and — usually — no record. the seller who paid for the afternoon receives an anecdote. ohm replaces the paper sign-in sheet with a thirty-second digital sign-in, then turns the afternoon into a measured, completed fact: a report the agent can hand to the seller.
visitors sign in without creating an account, in english, spanish, chinese, korean, or vietnamese.
what does the seller receive?
a seller's report measuring the open house:
- attendance — who came, and when.
- interest — what visitors expressed about the property.
- follow-through — what happened after the door closed.
like every sum28 instrument, the report is a completed fact you can hand to someone — measured, not asserted.
how does ohm handle visitor privacy?
consent-first, by construction:
- visitors see a versioned disclosure before any information is collected; the consent record is kept tamper-evident with sha-256 hashing.
- neighbors can sign in anonymously.
- opt-outs are honored through a suppression list covering stop, unsubscribe, and california ccpa requests.
- sum28 never sells a lead, a list, or a person — it is the second line of our constitution.
details are in the privacy policy.
how much does ohm cost?
ohm is free for licensed agents. hosting an open house with ohm costs the agent nothing — the sign-in, the measurement, and the seller's report are all included.
when does ohm launch?
ohm launches publicly in july 2026 at ohm.sum28.com. agents can sign in there today.
who makes ohm?
ohm is built by sum28 (SUM 28 LLC), a california company building trust instruments for real estate: p2d (photo to description, verified — live), ohm, and oak (equity, accounted — january 2027).