The CAS-powered notepad calculator.
Type math the way you think. GrayCalc combines symbolic algebra, engineering units and intuitive formulas—no coding skills needed.
Try the App – It's FreeLive Notebook
Structure your calculations in tidy sheets that update instantly as you type.
Symbolic Engine
Solve algebraic expressions and differentiate functions on the fly.
Engineering-Ready Formulas
Define variables and reuse them across calculations, just like you would on paper—optionally export to real code when you need it.
Cloud Sync
Your sheets stay in sync across devices with magic-link sign-in—no passwords required.