WP 31s is a classic RPN scientific calculator designed for iPhone users. Developed by Pascal Meheut, this free app offers a rich function set for daily use, making it a valuable tool for professionals and students alike.

Based on the powerful WP 34s calculator, WP 31s brings the same functionality to the iOS platform. While it may lack programmability, it more than makes up for it with its extensive feature set. The app boasts a less cluttered keyboard, making it easier to use and navigate.

For those who want to delve deeper into the capabilities of WP 31s, a manual can be downloaded from the official support site. This comprehensive guide provides detailed instructions on how to make the most of the app's functionalities.

Whether you need a reliable scientific calculator for work or study, WP 31s is a great choice. With its intuitive interface and robust feature set, it is sure to meet the needs of even the most demanding users.