Mass Appraisal in Minutes, Not Months
Run IAAO-compliant ratio studies with automated statistics, ML-powered clustering, and transparent valuations. From raw data to certified values — no installations required.
- Pipeline runtime
- < 5 min
- Compliant statistics
- IAAO
- Browser-based
- 100%
- Encryption
- 256-bit
Pipeline runtime
Compliant statistics
Browser-based
Encryption
How It Works
Four Steps. Under Five Minutes.
From raw CSV files to a fully compliant ratio study report — no installations, no manual data wrangling.
Upload Your Data
Drag and drop your CSV files — parcels, sales, land, improvements. Auto-validated on import with instant error feedback.
Supports Tyler iasWorld, ARC, ISSG, Vision, and custom CAMA schemas
Auto-Map Columns
M.A.P.S detects your CAMA schema and maps columns automatically. Review the mappings and adjust if needed — most offices change nothing.
95% accuracy on first-pass auto-detection
Run the Analysis
One click to compute IAAO-compliant statistics: COD, PRD, PRB, median ratios, and equalization factors across every district.
Full pipeline completes in under 5 minutes
Review Your Report
Interactive charts, maps, and compliance scores — ready to export as PDF or share with your team. No formatting needed.
Meets IAAO Standard on Ratio Studies requirements
What's inside
The Factor Workspace, in one view.
Tune land and improvement factors per neighborhood. Watch median ratio, COD, PRD and total change move as you go. Save versions for audit.
Cuyahoga County · Triennial 2026
CompletedOhio Triennial · 84,023 parcels · last run 4 min ago
- Median ratio
- 0.00
- COD
- 0.0
- PRD
- 0.00
- PRB
- 0.00
- Total change
- +0.0%
target 0.95
IAAO ≤ 15
0.98 – 1.03
±0.05
vs last
| NBHD | Dist | Land factor | Imp factor | Median ratio | COD | Change |
|---|---|---|---|---|---|---|
| 104 | A | 1.18 | 1.05 | 0.94 | 11.8 | +6.1% |
| 112 | A | 1.32 | 0.98 | 0.96 | 9.4 | +8.2% |
| 118 | A | 1.04 | 1.12 | 0.95 | 12.1 | +4.3% |
| 121 | B | 1.41 | 1.07 | 0.97 | 10.6 | +9.0% |
| 127 | B | 0.92 | 1.21 | 0.94 | 13.2 | +2.8% |
About Us
Modernizing Mass Appraisal
M.A.P.S was built to replace outdated tools with enterprise-grade analytics designed specifically for government assessors.
Our Mission
Mass appraisal is the backbone of fair property taxation. Yet most assessment offices still rely on legacy desktop software, manual spreadsheets, and processes that take weeks to complete.
M.A.P.S — Mass Appraisal & Property Services — exists to change that. We build modern, browser-based tools that bring IAAO-compliant analytics, machine learning, and transparent valuations to every assessor’s office, regardless of size or budget.
Ratio Study Results
Dane County, WI — 2026
- COD
- < 15%
- PRD
- 0.98 – 1.03
- Median ratio
- 0.90 – 1.10
Compliance by property type
Why Switch
Legacy Tools Weren't Built for This
See how M.A.P.S changes every step of the mass appraisal workflow.
The old way
- 2–4 weeks per valuation cycle
- Manual ratio statistics in spreadsheets
- Desktop-only legacy installs
- No audit trail for appeals defense
- Hand-picked comparable sales
With M.A.P.S
- Under 5 minutes, start to finish
- Automated COD, PRD, PRB and median ratios
- 100% browser-based — any device, any OS
- Complete audit trail with appeal-ready exports
- ML-powered comparable sales matching
What We Stand For
Accuracy First
Every statistic we compute meets IAAO standards. We never trade accuracy for speed — we deliver both.
Radical Transparency
Assessors need to defend their valuations. Every calculation in M.A.P.S comes with a complete audit trail and clear methodology.
Built for Government
We understand public-sector IT: browser-based access, no local installs, enterprise-grade security, and full compliance.
Get In Touch
Send Us a Message
Questions about pricing, procurement, or whether M.A.P.S fits your CAMA setup? Our team typically responds within one business day.
Contact Information
Reach out directly, or fill out the form and we’ll get back to you.
- Location
- South Milwaukee, WI
- Response time
- Within 1 business day
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Your Next Ratio Study Could
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Bring accurate, transparent, and defensible mass appraisal to your office — without installing a thing.