Executive Summary

Buyers, their agents, and compliance teams routinely lack trustworthy, accessible context and provenance for listings—past sale issues, disclosure gaps, neighborhood complaints and quick cosmetic flips are scattered across records, forums, and agent notes, making due diligence slow and error-prone for people making 5 million US home purchases a year. This creates a pain point for high-stakes decisions where missing context can cost tens of thousands of dollars or derail a deal. Build a listings-layer product that lets verified buyers and agents attach moderated annotations, timelines, documents and AI-summarized histories to addresses, with workflow controls, dispute resolution and MLS/broker integrations so annotations appear alongside listings inside agent tools. The platform would use automated moderation, reputation signals and human review to limit liability and surface concise, machine-readable provenance for each property. The market looks attractive now: an addressable opportunity of roughly $3.0B (5.0M transactions × ~$600 revenue per address via subscriptions, lead fees and data licensing) and two tailwinds—demand for provenance in high-value purchases and improved AI moderation/summarization tools—make timing favorable. You can differentiate by combining verified-contributor models, legal-first moderation workflows and direct MLS/broker integrations to be the trusted layer rather than an open forum, but expect real challenges around securing MLS partnerships, scaling moderation without heavy costs, and managing regulatory/liability risk.

Market Opportunity

Let buyers annotate listings with moderated context and history targets a $3.0B = 5.0M annual US home transactions × $600 average addressable revenue (agent subscriptions, lead fees, data licensing) total addressable market with medium saturation and a year-over-year growth rate of 6% YoY (proptech and listing enhancement tools adoption growth; sources: PropTech market reports and MLS tech adoption trends).

Key trends driving demand: Trend — Consumers increasingly demand transparency and provenance in high-value purchases, creating appetite for contextual listing data.; Trend — Advances in AI moderation and summarization make scalable community content feasible for regulated or liability-sensitive verticals like real estate.; Trend — MLS and brokerage platforms are exposing more APIs and partnership opportunities, enabling third-party integrations to augment listings.; Trend — Agents seek new, cost-effective channels to generate qualified leads and differentiate services, increasing willingness to pay for listing context features..

Key competitors include Zillow, Redfin, Nextdoor.

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Let buyers annotate listings with moderated context and history

Executive Summary

Market Validation

Market Opportunity

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