CLAPRT: Room Acoustics Meter

Measure room acoustics instantly with a hand clap. Professional RT60, SPL metering, noise dose tracking, and real-time FFT analysis. Trusted by audio engineers worldwide.

CLAPRT transforms your iPhone into a professional acoustic measurement system. Simply clap your hands to measure room reverberation time, or use continuous monitoring for comprehensive sound level analysis.

PROFESSIONAL ACOUSTIC MEASUREMENT

Whether you are an audio engineer setting up a recording studio, an acoustician analyzing room characteristics, or a safety professional monitoring workplace noise exposure, CLAPRT delivers the precision and features you need.

KEY FEATURES

RT60 Reverberation Analysis Measure room decay time with a simple hand clap. CLAPRT analyzes the acoustic impulse response to calculate RT60 across multiple frequency bands (125Hz to 4kHz). Identify room characteristics and evaluate acoustic treatment effectiveness using T20 and T30 calculation methods conforming to ISO 3382 standards.

Sound Level Metering Accurate SPL measurements with support for A-weighting (dBA), C-weighting (dBC), and Z-weighting (dBZ) frequency networks. View real-time levels, equivalent continuous sound level (Leq), maximum, minimum, and peak values. Pre-calibrated for reliable measurements right out of the box.

Noise Dose and TWA Tracking Monitor occupational noise exposure with built-in dosimeter functionality. Track Time-Weighted Average (TWA) and cumulative noise dose according to both OSHA (90 dBA, 5 dB exchange rate) and NIOSH (85 dBA, 3 dB exchange rate) standards. Essential for workplace safety compliance and hearing conservation programs.

Real-Time Spectrum Analysis Visualize audio frequencies with the built-in FFT spectrum analyzer. View octave band and third-octave band analysis to identify problematic frequencies, evaluate room modes, and fine-tune acoustic treatments. Perfect for audio system calibration and acoustic diagnostics.

Comprehensive Statistics Track measurement history with detailed statistics including LAeq, LCeq, LZeq, Lmax, Lmin, and Lpeak. Export data in CSV format for further analysis or documentation purposes.

BUILT FOR PROFESSIONALS

CLAPRT combines multiple professional audio tools into one intuitive interface. Features that typically require expensive dedicated hardware are now available in your pocket.

Use Cases:

• Recording studio acoustic analysis
• Live venue sound system optimization
• Architectural acoustics evaluation
• Workplace noise monitoring and compliance
• Home theater calibration
• Classroom and conference room assessment
• Environmental noise surveys
• HVAC noise evaluation

ADDITIONAL FEATURES

• iCloud sync keeps your measurement history across all devices
• Calibration support for external microphones
• Multiple measurement durations (15 seconds to continuous)
• Dark and light mode support
• Export and share measurement reports
• InstaDecibel: Overlay dB readings on photos for documentation

ACCURACY AND CALIBRATION

CLAPRT is pre-calibrated for iPhone microphones to provide reliable measurements for screening purposes. For professional applications requiring traceable accuracy, external calibrated microphones are supported.

Note: While CLAPRT provides highly accurate measurements for its intended use cases, smartphone-based sound level meters have not been certified to meet national or international standards for Type 1 or Type 2 sound level meters. For official compliance measurements, use certified equipment.

Download CLAPRT today and bring professional acoustic measurement capabilities wherever you go.

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