ATS Assessor Treasurer Software
ATS Assessor Treasurer Software: A free, county-focused system covering assessments, treasury workflows, records, and payments. Ranked #9 of 18 in Property Tax Software by our editors (8.3/10); pricing: Free plan; best for budget-conscious public-sector teams.
At a glance
- Editor score8.3 / 10
- PricingFree plan
- Best forBudget-conscious public-sector teams
- Free planYes
- Paid fromFree
- Tax calculationYes
- Founded2011 · Poulsbo, Washington, United States
- Facts checked20 Sep 2026
Where it wins
- Free, open-source model for county assessment and treasury operations
- Covers property records, levies, payment plans, and special cases
- RESTful API, accounting interfaces, and public Personal Property Online module
Where it doesn't
- The application is still described as being in development
- Designed for county operations rather than broad commercial use cases
- Platform coverage and integrations are not established
Our verdict on ATS Assessor Treasurer Software
ATS Assessor Treasurer Software is an open-source property-tax management application developed with Kitsap County, Washington. It is designed for county assessment and treasury teams managing real and personal property, assessments, levies, payments, fees, and related casework. The system also supports new construction, destroyed property, bankruptcies, foreclosures, LIDs, and a public-facing Personal Property Online module. Its focus is operational coverage for public-sector property-tax administration rather than general accounting or consumer tax preparation.
The published model is a significant fit for budget-conscious teams: ATS is freely available and open source. That can give counties more control over adapting the application, while Velosys offers implementation, customization, deployment, training, and consultation services. The product is therefore suited to organizations prepared to make decisions about configuration, deployment, and ongoing ownership. Teams should evaluate how those service needs align with their internal technical capacity and procurement approach.
ATS’s strongest case is its breadth within county property-tax workflows. It can manage assessments and levies, maintain property records, create payment and advance payment plans, control late fees and NSF payments, configure accounting interfaces, run flexible queries, and expose application data through a RESTful API. This range makes it a practical candidate for counties seeking an open-source foundation across assessment and treasury functions. However, the application is described as being in development, and Kitsap County is considering making it available to other counties. Counties seeking a mature, broadly available commercial system may prefer an alternative, while teams prioritizing cost control and adaptable public-sector software should consider ATS.
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ATS Assessor Treasurer Software pricing
ATS Assessor Treasurer Software fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Tax calculation | Yes |
| Assessment tools | Yes |
| Electronic filing | Not verified |
| Jurisdiction tracking | Not verified |
| Parcel data import | Not verified |
| Audit reporting | Not verified |
| API access | Yes |
| Support | |
| Built for | Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | velosys.com |
| Facts checked | 20 Sep 2026 |
Alternatives to ATS Assessor Treasurer Software
- DEVNET EdgeA broad, jurisdiction-focused suite covering appraisal through collection and public access.9.4
- itamlinkA broad property-tax platform for enterprise teams managing complex portfolios.9.2
- CSC PTMSA broad property-tax workflow platform for corporate teams managing complex portfolios.9.0
See all ATS Assessor Treasurer Software alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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