For County Assessors & Appraisal Districts

Know Which Properties Will Be Challenged
Before the Appeals Window Opens

PropGap runs the same comparable sales analysis that attorneys use to build appeals. Use it to pre-audit your own roll — identify over-assessments early, reduce surprise hearings, and validate your comps before they appear on Exhibit A.

Pre-Appeal Roll Audit

Run comparable sales checks on your own properties before the protest window opens. Spot assessments likely to be challenged and proactively correct obvious outliers — reducing your hearing docket.

Validate Your Comps

See which comparable sales the appeals system will surface for any address. Verify that your assessment is defensible against the same data pool attorneys pull — before the hearing, not during it.

Chapter 123 / §41.43 Compliance

PropGap applies the same statutory methodology used in NJ County Board hearings (Chapter 123 CLR) and TX ARB proceedings (§41.43). If an assessment is outside the fair range, you'll see it here first.

How Assessors Use PropGap

1
Run a batch check on your highest-value properties
Upload a CSV of assessed values — PropGap pulls comparable sales data and flags properties outside the statutory fair range. Focus your review on the properties most likely to generate valid appeals.
2
Review the comparable sales evidence
For each flagged property, see exactly which comparable sales were used, the price-per-sqft outlier filtering, and the equalization ratio applied. The same data that will appear in Exhibit A at your hearing.
3
Proactively adjust or document your defense
Either correct the assessment pre-appeal, or document why your value is supported despite the comp spread. Either way, you're prepared — not surprised.

Run Your First Check

Single-property checks are free when the assessment is within the fair range. Pro batch processing starts at $1,200/month — unlimited properties, active months only.

Check a Single Property Free Pro Batch Processing →