AOS

AOS

AOS Construction Software LLC
LienApp

LienApp

VADAR Systems
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About

AOS is construction software that keeps project management, pay applications, accounting, field paperwork, compliance, and closeout on one job record instead of five tools. It is built primarily for mid-market general contractors and commercial subcontractors, with role-based workflows for owners, developers, architects and engineers, residential builders, and permit expediters. Teams manage drawings, RFIs, submittals, schedules, change orders, daily logs, vendor prequalification, materials, accounts payable, and lien-waiver tracking from the project record. Pay applications are generated from the schedule of values, with retainage and stored materials. Pricing is a flat monthly fee, not a percentage of construction volume; the GC Launch Pack is capped at 50 active projects during beta, with some capabilities offered as add-ons or on request.

About

VADAR® is the recognized industry leader for revenue recovery and tax lien servicing software. Building on 20+ years of tax lien experience with both the government “sell” side as well as the investor “buy” side, we are revolutionizing the way our private investors manage their tax lien portfolios. VADAR® tax lien applications have successfully processed and managed more than $2 Billion dollars in tax lien investments and redemptions. Our enterprise-grade and future-proof LienApp® tax lien software coupled with expertise and award-winning customer service will save you time, money, and effort. Our robust cloud platform gives 24/7 secure access to your portfolio from any online device anywhere. VADAR®Systems is a premier provider of financial management software for both local governments and private sector companies. We provide a full array of turnkey Software and IT Solutions including software development, data migration, infrastructure assessment and design.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Supported
iPad Supported
Android Supported
Chromebook Not Supported

Audience

Mid-market general contractors and commercial subcontractors.

Audience

Companies that need tax lien software for revenue recovery

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Not Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$500/month
The GC Launch Pack is $500 per month during open beta, as a flat monthly fee for up to 50 active projects. There are no per-user fees during beta. Signups by December 14, 2026 lock the beta rate through July 13, 2028. Estimating and ITB are paid add-ons; some other capabilities are available on request.
Free Version Not Supported
Free Trial Not Supported

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Training

Documentation Supported
Webinars Supported
Live Online Supported
In Person Supported

Company Information

AOS Construction Software LLC
Founded: 2024
United States
aos.build

Company Information

VADAR Systems
Founded: 1996
United States
www.vadarsystems.com/taxliensoftware

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Categories

Categories

Investment Management Features

Accounting Management Supported
Benchmarking Not Supported
Bonds / Stocks Supported
Client Management Supported
Commodities Not Supported
Compliance Reporting Supported
Data Import / Export Supported
For Investment Advisors Supported
For Investors & Traders Supported
Fund Management Supported
Modeling & Simulation Supported
Payroll & Commissions Not Supported
Performance Metrics Supported
Portfolio Management Supported
Risk Management Supported

Integrations

SendGrid Supported
Twilio Supported

Integrations

SendGrid Not Supported
Twilio Not Supported
Claim AOS and update features and information
Claim AOS and update features and information
Claim LienApp and update features and information
Claim LienApp and update features and information