Sound Meter Pro: Decibel dB

Sound Meter Pro turns your phone into a real-time sound meter, decibel meter, noise meter and dB analyzer for measuring sound levels around you.

Measure noise in dB, follow live graphs, analyze frequency bands, set alerts, save sessions, export reports and calibrate your microphone for more consistent results.

Use it to check room noise, neighbors, sleep environments, appliances, offices, classrooms, traffic, cars, motorcycles, construction, work zones, concerts and loud events.

🔹 Real-time dB sound meter
• Live decibel reading in dB
• Clear speedometer-style sound level display
• MIN, AVG, MAX, LEQ and PEAK values
• Start, pause, resume and reset measurements
• Direct, 1 second, 10 second, 1 minute and 5 minute windows
• Fast and Slow response modes
• A, C and Z acoustic weighting options
• Signal quality indicator
• Microphone clipping and saturation detection

🔹 Noise graphs and sound analysis
• Real-time sound level graph
• Frequency spectrum by bands
• Spectrogram view to see how sound changes over time
• Frequency references: 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz and 8 kHz
• Spectrum peak hold and freeze mode
• Dominant frequency band detection
• Low, mid and high frequency analysis
• Technical reading with weighting, response time and dominant band details
• Automatic summary of the sound environment

🔹 Smart noise alerts
• Configurable noise threshold
• Visual warning when your selected dB limit is exceeded
• Noise threshold, exposure, duration and saturated signal alerts
• Optional vibration, alert sound and notifications

🔹 Sound exposure information
• Time accumulated above your selected threshold
• Projected exposure estimate for an 8-hour period
• NIOSH, OSHA and EU-style exposure references
• TWA, dose and LEX,8h calculations

Sound exposure information is for reference only. Sound Meter Pro is not a medical device and does not replace professional occupational noise assessment, certified equipment or health advice.

🔹 Presets for common situations
• Custom mode
• Home noise
• Neighbors
• Sleep
• Car and motorcycle
• Construction and work
• Concerts and loud events

🔹 Calibration tools
• Microphone calibration assistant
• Manual calibration offset
• Calibration with external reference
• Sound meter and acoustic calibrator support
• Calibration profiles
• Internal and external microphone profiles
• Frequency compensation options

🔹 Sessions, history and reports
• Save measurement sessions
• Add notes, tags, folders and metadata
• View saved sessions
• Analyze historical noise trends
• Compare measurements over time
• Export measurements as CSV
• Export reports as PDF
• Export visual results as PNG
• Export technical data as JSON or text
• Create backups and import them when needed

🔹 Background measurement
• Continue noise measurement in the background when enabled by the user
• Persistent notification while background measurement is active
• Stop button available from the notification

🔹 Privacy-first design
Sound measurement is processed on your device. The microphone is used to calculate sound levels. Audio is not uploaded to our own servers. Saved sessions, exports and backups are stored locally unless you choose to share or move them.

🔹 Premium upgrade
Optional premium access removes ads and can unlock advanced exports, historical trends, spectrogram, calibration profiles, microphone compensation, background measurement, backup and restore tools, and advanced reporting features.

🔹 Available in multiple languages
Available in English, Spanish, Catalan, German, French, Hindi, Indonesian, Italian, Japanese, Korean, Dutch, Polish, Portuguese, Russian, Thai, Turkish, Ukrainian, Vietnamese and Chinese.

Important note:
Sound Meter PRO provides approximate measurements. Accuracy depends on your phone microphone, hardware, calibration and environment. This app is not a certified sound level meter, not a medical device and not a substitute for professional acoustic, occupational or health advice.