Free42 is a high-fidelity simulator of the HP-42S RPN scientific calculator and the HP-82240 printer. It offers a seamless experience for both casual users and professionals who rely on precise calculations. This powerful tool replicates the original HP-42S interface, providing all the advanced functions and programmability of the classic device. Whether you're performing complex mathematical computations, engineering tasks, or financial analysis, Free42 ensures accuracy and efficiency. The application is available for multiple platforms, including Windows, macOS, Linux, iOS, and Android, making it accessible wherever you go. Enjoy the nostalgia of the HP-42S with the convenience of modern technology. Download Free42 today and elevate your calculation capabilities!



The app has potential, but I've experienced bugs that can’t be overlooked. It’s definitely better than some other calculators, but it can get frustrating. Hoping for an update soon!