RationalCalc Free, developed by Snoffleware Studio LLC, is a unit-aware project calculator for Android that allows users to calculate length with automatic unit conversions. It features rounding up or down to common fractions such as 1/4, 1/8, andThe latest update includes a Foot/Inch mode, which can be activated by touching Settings - Display Unit - Foot/Inch. This app is particularly useful for carpentry, machining, surveying, and DIY projects.

It is important to note that users should set the "Display Unit" and "Precision" from the menu to match their situation. The app is free to use and can be accessed for more information at rationalcalc.com. Additionally, the source code is now available on Github for those interested in contributing to the project.