Walkback — reviewed changes between property walkthroughs

The problem

Repeat inspections require comparing footage from different visits. LingBot-Map offers scene reconstruction and MiniCPM-V can examine images, but neither produces an inspector-confirmed change record.

The idea

Why now

LingBot-Map makes video-based reconstruction accessible, while MiniCPM-V 4.7 provides an open vision-language model for examining selected frames.

What it combines

LingBot-Map can provide spatial context for finding viewpoints; MiniCPM-V suggests descriptions for inspector-selected frame pairs. Raw frames remain usable when reconstruction fails.

How to build it

1. Ingest. Accept two walkthrough videos for one property. (1 day)
2. Present. Show raw video and attempt reconstruction for each visit. (1 day)
3. Compare. Let inspectors pair frames and request suggested change descriptions. (1 day)
4. Confirm. Export approved changes with paired images. (1 day)
5. Test. Measure review time with and without scene views. (1 day)

Who benefits

Inspectors

Find and record visible changes faster when the workflow helps.

Property managers

Receive an evidence-linked, reviewed record.

How it makes money

Model

Per-property subscription

Pricing

$15 per property per month

Wedge

A property manager with recurring walkthroughs

Channels

Property-management firms · Inspection contractors

Distribution

Property-management firms pay and give inspectors the workflow. The wedge is recurring move-in, move-out, or maintenance walkthroughs; inspection contractors are a second channel.

Why it wins

Walkback sells a picture-backed, human-confirmed change record rather than an autonomous damage finding, valuation, or tenant accusation.

Risks

Indoor reconstruction or mismatched camera paths may erase the time savings. Compare raw-video-only and reconstruction-assisted review times, and retain the raw-video path as the fallback.

Strongest objection left standing

Manual viewpoint pairing may take as long as ordinary video review, particularly when indoor reconstruction is poor.

Build it with

• LingBot-Map: streaming 3D reconstruction foundation model (ECCV 2026 best-paper candidate)Offer reconstructed scene views when walkthrough footage supports them.
• MiniCPM-V-4.7: openbmb's 35B-A3B and 1B vision-language modelsSuggest descriptions of inspector-selected frame pairs.

Repo to start from

walkback - confirmed property changes with paired video evidence

Evidence

• LingBot-Map
• MiniCPM-V 4.7

Debated by openai/gpt-6-sol, anthropic/claude-sonnet-5.5, qwen/qwen3.8-max-0902, moonshotai/kimi-k2.5. Judged by JEV.