RPM Meter: Stroboscope for Android

RPM Meter: Stroboscope is a productivity application designed for contactless rotational-speed measurement on Android devices. This tool employs stroboscopic LED pulses or camera frame sampling to capture and display RPM readings directly on the screen. It includes essential features such as a harmonic helper to assist in identifying harmonic multiples, unit conversions between RPM and Hz, and calculators for gear ratios and surface speeds. Ideal for mechanics, technicians, and hobbyists, the app operates offline, allowing for device-based inspections without the need for accounts or internet access.

The application provides two distinct measurement modes: Strobe Mode, which utilizes the device's LED flash, and Camera Mode, which samples camera frames to achieve a visual freeze of rotating components. Users can optimize their measurements by manually adjusting camera settings for exposure and focus, making it suitable for various lighting conditions. While it offers practical offline functionality and simple recordkeeping for workplace tasks, the app's performance is ultimately dependent on the hardware capabilities of the user's device, particularly its LED and camera specifications.