intuitive. powerful. touchable.

Touch Your Numbers

RK-83, the latest incarnation of RKalk, brings a familiar graphing and scientific calculator to your iPhone and iPod Touch.

Get the latest version: now with loops and user defined functions!

How Do I...?

Utilize the more advanced features available in RK-83. We are constantly expanding RK-83's concise documentation into an extensive support resource.

Stay tuned: as RKalk expands, so will its reference materials.