The underlying systems

What actually feeds the engine

PAYROLL

OpenDataPhilly payroll records

Every city employee's title, department, and salary, 2016–present, refreshed as new data is published.

Used by: CompensationAtlas

ASSESSMENTS

Office of Property Assessment (OPA)

Live property assessment records and recent comparable sales, pulled directly from OPA.

Used by: TaxAssessmentIQ, ListingIQ

PERMITS & VIOLATIONS

Licenses & Inspections (L&I)

Building permits, business licenses, and code violations — active and historical.

Used by: LandlordEye, BlockWatcher, ListingIQ

SERVICE REQUESTS

311 service requests

Resident-filed service requests, connected into a single feed alongside permits and violations.

Used by: BlockWatcher

HOUSING COURT

Public eviction filings & rental licensing

Public eviction court filings and rental licensing status, tied back to the property owner.

Used by: LandlordEye

MARKET & NEIGHBORHOOD

Market and neighborhood data

Comparable sales, walkability, transit, and schools, combined into neighborhood-level context.

Used by: ListingIQ

How we treat the data

We connect public records — we don't manufacture them. Every figure on an ALKARTIS product traces back to a specific, checkable source system, not an estimate or a model's guess.

That comes with a limitation worth stating plainly: ALKARTIS is only as current and accurate as the source agency's own data. Update frequency varies by system — some feeds refresh continuously, others on a quarterly or as-published basis — and any error present in the original public record can carry through to what we show. Where that matters, the relevant product page and FAQ say so directly.

SEE THE ARGUMENT

For why connecting these sources is different from publishing or visualizing them, see Why ALKARTIS.

HOW THIS IS SHOWN

For how sources, methodology, and limitations show up inside every product, see Explainable Intelligence.

QUESTIONS ABOUT A FIGURE

Reporters and researchers can reach out directly — see Press or Contact.

HOW WE HANDLE YOUR DATA

For what we collect about you (not the source data above) and where we are as a company, see Trust & Data Practices.

← See the architecture