RecedWavBeFront is a user-friendly and feature-rich mobile application designed to simplify complex wave-related calculations involving motion. This app includes three highly useful calculators that cater to scenarios related to wave velocity, frequency, and wavelength in the context of moving sources. These calculators are: Recending Source, Wavelength Behind the Source, and Wavelength in Front of the Source. Each of these tools helps users understand how motion affects wave behavior, based on principles of the Doppler effect. The Recending Source calculator allows users to input the wave velocity and the wavelength observed behind the source to determine the source's velocity. In contrast, the Wavelength Behind the Source calculator calculates the elongated wavelength when the source is moving away from the observer. Meanwhile, the Wavelength in Front of the Source calculator computes the compressed wavelength that results when the source is moving toward the observer. These features make the app valuable for students, educators, and professionals working in physics, acoustics, or related fields. One of the standout features of RecedWavBeFront is the built-in QR code generation functionality. After performing any calculation, users can instantly generate a QR code containing the calculated result. This enables quick sharing, documentation, or even educational demonstrations. Beyond just generating the QR code, users can also share it with others or download it directly to their device for later use. This seamless integration of wave mechanics and modern digital utility tools makes the app not only educational but also practical for real-world use. Overall, RecedWavBeFront offers a clean interface, accurate calculation mechanisms, and smart sharing capabilities, making it a comprehensive companion for anyone exploring wave motion phenomena.