MeterKit - Sound & Level Tools

MeterKit turns your iPhone into a professional measurement toolkit. 7 precision tools powered by your phone's built-in sensors — no extra hardware needed. SOUND METER (dB) Measure noise levels in real-time with dBA/dBC weighting. See live graphs, peak levels, and average readings. Know instantly if your environment is too loud. BUBBLE LEVEL Precision surface level with clinometer. 3D visualization shows exact degrees of tilt. Perfect for hanging frames, leveling furniture, or checking slopes. METAL DETECTOR Uses your iPhone's magnetometer to detect metal objects, studs, and magnetic fields. Visual and audio feedback guides you to the source. VIBRATION METER Measure vibration intensity with your phone's accelerometer. Useful for checking washing machines, HVAC systems, or detecting structural vibrations. EMF DETECTOR Detect electromagnetic fields in your environment. Real-time readings from the magnetometer displayed in microtesla (μT). HEARING TEST Quick frequency sweep audiogram to check your hearing range. Test each ear individually. Know your hearing profile in 2 minutes. DOG WHISTLE Generate high-frequency tones beyond human hearing. Adjustable frequency from 15kHz to 22kHz. Train your dog or test your hearing range. WHY METERKIT Decibel X charges $4.99/month for a sound meter alone. MeterKit gives you 7 professional tools for one single payment. No subscription. No ads. No data collection. Ever. All measurements happen on-device using your iPhone's built-in sensors: - Microphone → Sound meter, hearing test - Accelerometer → Vibration meter, bubble level - Magnetometer → Metal detector, EMF detector - Speaker → Dog whistle, frequency generator FEATURES - Live Activities: see real-time dB readings on your Lock Screen - Dynamic Island: active measurement indicator - Widgets: home screen noise level widget - Dark mode native - Works completely offline - Privacy: zero data leaves your device One price. No subscription. No ads. Buy once, measure forever.