This utility app tests the write speed of your USB-C external drives on compatible iPhones. It provides a clear verdict on whether your drive can handle demanding video formats like ProRes, ensuring smooth recordings.
1.1
October 29, 2026
Added support for iPhone Duo. This build also includes fixes for some minor bugs to improve the overall app experience.
REC Disk Speed Test is a utility app designed to measure the write speed of your USB-C external drives directly on your iPhone. It helps determine if your drive is fast enough for demanding video formats like ProRes.
No, REC Disk Speed Test is ad-free. It is a free application developed by the team behind REC and Photon Camera.
REC Disk Speed Test requires an iPhone 15 Pro or a later Pro model with USB-C external storage support. It is currently only available for iPhone.
The app provides a clear, color-coded verdict indicating your drive's readiness for different video formats. It also offers a format-by-format breakdown, including HEVC and ProRes at various resolutions and frame rates.
In addition to write speeds, REC Disk Speed Test displays your drive's name, total capacity, and the amount of free space available. It also checks if the drive's file system is supported for video capture.
The latest version of REC Disk Speed Test is 1.1, which was last updated on October 29, 2026. Specific update frequency is not detailed, but it is developed by a team with other camera apps.
REC Disk Speed Test has an age rating of 17+. This is likely due to the technical nature of the app and its target audience of professional content creators.
REC Disk Speed Test specifically focuses on measuring the write speed of your external drives. This is crucial for ensuring smooth video recording, as writing data is the primary bottleneck for such tasks.
