phyphox.org

One-line Overview

phyphox.org is a free, open-source mobile app developed by RWTH Aachen University in Germany. It cleverly turns the sensors built into a smartphone—such as the accelerometer, gyroscope, magnetometer, microphone, light sensor, and more—into tools for physics experiments. Without buying expensive professional equipment, users can run a wide range of experiments in mechanics, acoustics, electromagnetism, optics, and other areas using only a smartphone. The reason phyphox is popular among educators and physics enthusiasts worldwide is its zero cost, high flexibility, and support for remote control, making physics experiments no longer confined to a laboratory environment.

Business Overview

phyphox is not a commercial company, but an academic project led by the 2nd Institute of Physics at RWTH Aachen University in Germany. Its full name is “Physical Phone Experiments.” Since its launch in 2016, the project has been open-source, free, and non-profit, with the goal of lowering the barrier to physics experiments and promoting science education. In terms of its position in the field, phyphox is a benchmark product for physics experiments using smartphone sensors, and it has been adopted by many secondary schools, universities, and science outreach organizations around the world. Its users range from secondary-school physics teachers and university lecturers to research hobbyists, homeschooling parents, and even engineers who need quick prototype validation. Unlike commercial educational software, phyphox does not rely on paid subscriptions or a hardware ecosystem. It is entirely based on smartphone hardware and user-defined experiments. This decentralized model has earned it an excellent reputation in the open-source and education communities. The project is continuously updated, with new sensor support and experiment templates added regularly. Users can also create their own experiments through simple programming.

Who It’s For

The core target users of phyphox are physics teachers and students at secondary-school and university level. It is especially suitable for schools with limited laboratory equipment and budgets that still want to deliver high-quality experimental teaching. For physics enthusiasts or science-content creators, it makes it easy to demonstrate concepts such as acceleration, sound frequency, and changes in magnetic fields, making it a powerful tool for educational videos and live experiment demonstrations. Researchers or engineers who need to temporarily measure vibration, tilt, sound waves, or similar data can also use it as a low-cost tool for prototype validation. However, it is not ideal for enterprise-grade R&D scenarios that require extremely high precision or complex control, because smartphone sensors have limited accuracy and usually lack professional calibration. For users in China, since the app is completely free and requires no registration, individuals can download and try it directly. However, schools or educational institutions that need bulk deployment or custom functionality may need to build their own experiment templates or work with the open-source community.

Key Features and Highlights

• Zero-cost and open-source: Completely free, with no in-app purchases or ads. The source code is publicly available on GitHub, allowing users to modify and redistribute it, which makes it suitable for bulk deployment by educational institutions.
• Rich built-in experiment templates: Comes with more than 20 standard experiments, including pendulum experiments, spring oscillators, speed of sound measurement, the Doppler effect, magnetometer compass experiments, and more. Users can run them directly without programming.
• Remote experiment control: Via Wi-Fi or Bluetooth, users can control the experiment phone remotely from a computer or another phone and view sensor data in real time. This is useful for demonstrations or experiments in potentially risky environments.
• Custom experiment editor: Users can freely combine sensors, set trigger conditions, and customize data export formats through a simple graphical interface or by writing JavaScript code, making it suitable for personalized experimental needs.
• Multi-platform support: Available for Android and iOS, and it also supports a web version via browser access. Data can be exported in CSV format for analysis on a computer.
• Real-time data visualization: Sensor values and charts are displayed dynamically during experiments, with support for multi-axis display, zooming, and annotations, making it convenient for live classroom demonstrations.

Pricing Analysis

phyphox is positioned as “completely free,” which places it at the very low end of comparable products. Commercial applications with similar functionality, such as companion software for “Pasco Wireless Sensor” or “Vernier Graphical Analysis,” usually require users to purchase dedicated sensor hardware costing hundreds to thousands of RMB, and the software itself may also involve annual fees. By contrast, phyphox is not only free as software, but also requires no additional hardware, directly using the smartphone users already own. The only potential cost is the phone’s battery consumption, which is almost negligible. There are no hidden fees and no premium paid features; all features are open to all users. For users in China, this means they can obtain a complete physics experiment system for free, with an extremely high cost-performance ratio. That said, the project does not provide commercial support or custom services. If enterprise-grade after-sales support is required, other paid solutions may be more appropriate.

How Chinese Users Can Use It

Network accessibility: The Android version of phyphox can be downloaded from Google Play or F-Droid, while the iOS version is available from the App Store. Users in China can also access the official website, phyphox.org, without a VPN and download the APK installer directly from the official download link. The app itself does not depend on overseas servers during use, and all data processing is completed locally, so network accessibility is excellent. Payment methods: Since the app is completely free, no payment is required, so payment methods are not an issue. Is a VPN required? Daily use does not require a VPN. However, accessing the source code on GitHub or participating in community discussions may require a VPN. Domestic alternatives in China: There are local options such as “手机物理工坊” and customized apps developed by some educational institutions, but their functionality and update frequency generally fall short of phyphox. In addition, phyphox supports a Chinese interface, which can be enabled in settings, making it friendly to Chinese users. Invoice issues: As an open-source free project, phyphox does not provide commercial invoices. If a school or organization needs reimbursement documentation, it may try supporting the project via donation or contacting RWTH Aachen University for a receipt, but the process may be relatively complicated.

Pros and Cons

Pros:

• ✅ Completely free and open-source, with no paywalls or ads
• ✅ Uses built-in smartphone sensors, with no extra hardware required
• ✅ Supports remote control, suitable for classroom demonstrations and hazardous experiments
• ✅ Rich experiment templates, with support for custom editing
• ✅ Cross-platform support across Android/iOS/Web, with convenient data export

Cons:

• ❌ Smartphone sensors have limited accuracy and are not suitable for high-precision research
• ❌ No official Chinese-language customer service or technical support; community responses depend on open-source forums
• ❌ No commercial invoices, making school reimbursement difficult
• ❌ Some sensors, such as barometers, are not available on all phones
• ❌ Remote control requires a reasonably stable network connection

Comparison with Similar Products

Compared with Pasco Capstone or Vernier Graphical Analysis, phyphox’s biggest advantage is zero cost. The other two typically require dedicated sensors costing hundreds to thousands of RMB, such as force sensors or photogates, and the software may require payment or be tied to specific hardware. However, Pasco and Vernier sensors offer higher precision and professional calibration certificates, making them more suitable for university or enterprise laboratories. Another open-source alternative is an Arduino physics experiment kit, but it requires additional hardware and programming knowledge, creating a higher barrier to entry. In China, smart classroom products, such as physics simulation experiments from iFlytek or seewo, focus more on virtual simulation rather than real sensor-based data collection, which differs from phyphox’s positioning around “real experiments.” Overall, phyphox strikes a unique balance between “low-cost entry” and “real data collection.”

Recommendation

phyphox is best suited for budget-conscious secondary-school physics teachers and self-learners who value flexibility, especially in scenarios where real physical phenomena need to be demonstrated on-site but professional equipment is unavailable. It is also an excellent tool for science communicators making experiment videos. However, it is not suitable for enterprises or university laboratories that require high-precision measurement, commercial after-sales support, or official invoices. For users in China, it is recommended to download and try it for free, starting with the built-in experiment templates before gradually exploring custom experiments. If you only use it occasionally, there is no need to pay anything at all. If you plan to use it long-term for teaching, you may consider supporting the project through donations. Overall, phyphox is a “zero-cost, high-return” educational tool that is well worth trying for every physics educator and student.