Decibel Meter: Sound & Level

A decibel meter and sound level meter in your pocket, plus a spirit level, metal detector, compass, flashlight and 15+ sensor tools, all in one free app.

Use it as a dB meter to check noise at home, at work or at a concert. The live display shows sound pressure level (SPL) in decibels with OSHA safety warnings, so this noise detector helps you see when a room is too loud. Use the bubble level as a simple level tool to hang pictures straight, and the metal detector as a stud finder app for walls.

🔧 PRACTICAL TOOLS
• Spirit Level: 2D bubble level for hanging pictures, checking surfaces, and leveling furniture
• Metal Detector: find studs in walls, locate pipes, and detect metallic objects with haptic feedback
• Decibel Meter: measure sound levels (dB) with a live display and OSHA safety warnings
• Vibration Analyzer: diagnose equipment issues and detect vibration patterns
• Accelerometer: measure G-force, vehicle acceleration, and impact force

🧭 COMPASS & NAVIGATION
• Digital compass with magnetic heading and cardinal directions
• GPS coordinates (latitude, longitude, elevation)
• Live altitude calculator using barometer + GPS
• Tilt-compensated orientation for accurate readings
• Magnetometer with strength display (µT)

📊 SENSOR DASHBOARD
Monitor 10+ phone sensors live:
• Accelerometer (X, Y, Z motion)
• Gyroscope (rotation tracking)
• Magnetometer (magnetic strength)
• Barometer (atmospheric pressure)
• GPS / Location
• Proximity sensor
• Ambient light sensor
• Battery level and charging status
• Sound level (decibels)
• Pitch detector (frequency and musical note)

🔦 FLASHLIGHT & LIGHTING
• Powerful LED flashlight with instant toggle
• Strobe light (1 to 20 Hz adjustable) for parties and events
• SOS morse code signal for emergencies
• Red light mode to preserve night vision
• Screen light with customizable colors
• Auto-off timer (5, 10, 15, 30 minutes)

🎤 CONCERT MODE
Stand out at concerts, festivals, and live events:
• Scrolling text messages with emoji support
• 10+ templates (MARRY ME, HAPPY BIRTHDAY, I LOVE MUSIC)
• Beat-sync strobe: the flashlight pulses to music rhythm
• Color effects: solid, gradient, rainbow animation
• Share to TikTok, Instagram, and Snapchat

🎵 AUDIO ANALYSIS
• Beat detection for music-reactive lighting
• Pitch detection: identify musical notes (A4, C5, etc.)
• Sound frequency analysis with FFT
• Adjustable microphone sensitivity

💡 WHO IS THIS FOR?
✓ Home improvement: hang pictures straight, find studs, check surfaces
✓ Construction & DIY: level measurements, metal detection, vibration analysis
✓ Outdoor & hiking: compass navigation, altitude tracking, GPS coordinates
✓ Music & concerts: concert lighting, beat-sync strobe, sound measurement
✓ Students & teachers: physics demonstrations, sensor exploration
✓ Sound engineers: decibel monitoring, frequency analysis, pitch detection
✓ Emergency preparedness: SOS signal, flashlight, compass

⭐ WHY CHOOSE THIS APP?
• 100% FREE: all tools included, no hidden paywalls
• Works OFFLINE: most tools need no internet connection
• LIGHTWEIGHT: small app size, low battery usage
• PRIVACY-FIRST: all sensor data stays on your device
• ONE APP replaces a sound meter, spirit level, metal detector, compass, flashlight, strobe light and a phone toolbox of sensor tools

Whether you need a noise meter to check a loud room, a sound level meter for work, or a bubble level for a quick DIY job, it is all in one lightweight app.

Recent changes:
New: The compass shows an "Open settings" button when location access is blocked.
Improved: The compass needle moves as smoothly as in version 1.1.7 again.
Improved: Compass calibration now tells you when you did not turn the phone enough.
Fixed: Strobe and SOS now stop when you switch flashlight mode.
Fixed: Tapping "Enable microphone" twice no longer keeps the microphone on.