Take control of your finances and future
All-in-one bookkeeping, accounting, and reporting tools that help small businesses improve margins and stay independent.
AI Finance Workforce
Deploy AI finance employees that handle bookkeeping, accounting, FP&A, tax prep, and AR management—all overseen by certified accountants. Your back office, automated.
Everything Your Finance Team Needs
Purpose-built for agencies, home services, and construction companies. Automated finance operations with expert oversight, so you can focus on serving your customers and growing your business.
Automated Bookkeeping
Streamlined Tax Prep
Expert Oversight
Real-Time Reporting
Cash Flow Tracking
Accounts Receivable
Strategic FP&A
Invoice Management
ABOUT US
Built for businesses that need better margins
We serve agencies, home services, and construction companies with all-in-one finance operations. Our platform handles bookkeeping, accounting, FP&A, tax prep, and accounts receivable—backed by certified accountants who provide oversight and strategic guidance when you need it.
Take control of your back office. Focus on what matters.
Why We Built This
We're former business owners who started Castar because we were tired of spending weekends on bookkeeping instead of growing our companies. Every hour spent reconciling transactions or chasing invoices was an hour not spent serving customers.
So we built software that handles the tedious work—with expert accountants providing oversight—so you can focus on your business. For companies with complex needs, we offer customized solutions that scale with you. Whether you're a growing agency or an established construction firm, we help you take control of your finances and improve your margins.
Trusted by SMBs Like Yours
We were drowning in invoices and bookkeeping. Castar handles it all so we can focus on client work. Our margins improved within the first quarter.
Sarah Mitchell
Owner, Creative Agency (12 employees)
Tax season used to be a nightmare. With automated prep and CPA oversight, we breezed through it. Best investment we've made for our home services business.
Mike Rodriguez
CEO, HVAC Services (28 employees)
The financial insights help us bid more accurately and plan better. We finally have enterprise-level operations without the enterprise cost.
Lisa Chen
CFO, Construction Firm (45 employees)
Accounts receivable was killing our cash flow. Now we get paid faster and spend less time chasing invoices. Game changer for agencies.
David Park
Founder, Marketing Agency (15 employees)
Bookkeeping was eating up hours every week. Now it's automated and accurate. We can focus on our customers and growing the business.
Jennifer Wu
Owner, Plumbing Services (22 employees)
Custom solution for our construction company was exactly what we needed. Handles the repetitive work while our CPA handles the complex stuff. Perfect balance.
Robert Thompson
Director, Commercial Construction (38 employees)
Questions about
back office automation?
Still have questions? Contact ourfinance teamtoday.
Ready to improve your margins?
Join businesses already using Castar to take control of their back office. Get expert-backed finance operations up and running fast.