Phyphox, developed by RWTH Aachen University, is a mobile application designed to convert smartphones into portable physics laboratories. By tapping into the array of sensors embedded in modern iPhones, it enables users to conduct a wide range of scientific experiments without specialized hardware. In the educational app market, it stands out as a no-cost solution that bridges theoretical concepts with hands-on practice, offering an alternative to traditional lab equipment for schools and individuals. The app's core functionality revolves around real-time data acquisition from sensors including the accelerometer, gyroscope, light sensor, and microphone. Pre-configured experiments, such as determining local gravity through free-fall measurements or analyzing pendulum oscillations, guide users through common physics principles. Data can be recorded, plotted, and exported in CSV format for further analysis, supporting both qualitative observation and quantitative study. Additional features include customizable experiment setups and integration with external sensors via Bluetooth, though these require some technical familiarity to optimize. In practical use, Phyphox offers an intuitive interface that simplifies sensor access, though some initial familiarization with the experiment setups is required. Real-world applications extend beyond classrooms; for instance, enthusiasts can measure the acceleration of a car ride or assess the acoustic properties of different environments. However, the accuracy of results depends on the smartphone model and sensor calibration, which may vary between devices. Users report that while the app performs reliably in controlled settings, outdoor experiments might be affected by environmental factors like wind or uneven surfaces. With a rating of 4.59556 out of 5, Phyphox receives high marks from its user base, though detailed reviews are scarce. Feedback trends suggest that educators value its ability to demonstrate physics phenomena in engaging ways, while students appreciate the immediate feedback from experiments. Some users report minor issues with data stability on older iOS versions, but overall, the app is praised for its reliability and educational impact. A common note is that the free nature of the app makes it accessible, but occasional app updates can introduce small bugs that are typically resolved quickly. Phyphox presents a compelling tool for experimental physics, offering accessibility and innovation at no cost. Its main strengths lie in sensor integration and educational relevance, but limitations include sensor precision constraints and a focus that may not appeal to casual users. For those invested in science education, it represents a significant advancement in mobile learning technology, though it works best as a supplement rather than a replacement for professional laboratory equipment.