Woman confidently working at desk building ThreeOneOGirl software

Financial clarity for everyone

Too often, personal finance tools are locked behind high advisory fees or complex software designed for industry professionals.

We believe everyone deserves access to powerful, easy-to-understand financial tools — regardless of their net worth or upbringing. ThreeOneOGirl builds software that puts sophisticated personal finance calculators into the hands of everyday people.

Built on principles that matter

Every tool we create follows these core beliefs.

Ease of use

We understand not everyone has a degree in finance or accounting — and a lot of personal-finance terms are confusing. We use simple, plain language so anyone can follow along.

Information at your fingertips

Embedded throughout our apps are links to more information, explaining concepts most people are not familiar with — so you can learn as you go.

Security & privacy

Your financial data stays yours. It's encrypted in transit and at rest, we collect the minimum we need, and you can delete everything at any time — no questions asked.

Tools that work for you

Software designed to answer the financial questions that actually matter.