Comparing US Property Data APIs: ATTOM vs CoreLogic vs Regrid

A side-by-side comparison of the three major US property data API providers — what they cover, how they differ, and which one fits your use case.

If you are building an application that needs property data at scale, you will likely evaluate ATTOM, CoreLogic, and Regrid as your primary API options. Each has distinct strengths depending on your use case, budget, and technical requirements.

ATTOM Data Solutions

ATTOM provides REST APIs covering property details, tax assessments, deed transfers, mortgage records, foreclosures, and environmental risk. Their self-service API portal allows developers to start quickly with a free trial. Best for: mid-market applications needing broad property data coverage.

CoreLogic

CoreLogic is the largest US property data provider with the deepest historical records and MLS integration. They offer AVMs, property condition data, and mortgage performance analytics. Access is enterprise-focused. Best for: large enterprises, lenders, and insurers needing comprehensive data and analytics.

Regrid

Regrid specializes in parcel boundary (GIS) data with nationwide coverage from 3,100+ counties. They standardize ownership, land use, and zoning data into clean geometries. Best for: mapping applications, GIS analysis, and land use research.

Quick Comparison

• Coverage: CoreLogic (99.9%) > ATTOM (155M+) > Regrid (155M+ parcels)
• API self-service: ATTOM (yes) > Regrid (yes) > CoreLogic (enterprise only)
• GIS/parcel data: Regrid (best) > ATTOM (available) > CoreLogic (limited)
• Pricing: Regrid (transparent tiers) > ATTOM (published plans) > CoreLogic (custom quotes)
• MLS data: CoreLogic (direct) > ATTOM (limited) > Regrid (none)