SPL Meter - Sound Level Meter

Transform your iPhone into a professional-grade sound level meter with SPL Meter. Whether you are a sound engineer, health and safety professional, musician, or simply concerned about noise exposure, SPL Meter provides the accurate measurements you need. PROFESSIONAL MEASUREMENT FEATURES SPL Meter delivers precise sound pressure level readings using advanced DSP algorithms compliant with ANSI Type 1 standards. The app supports multiple frequency weighting options to match your specific measurement requirements: A-Weighting (dBA): The standard for measuring environmental and occupational noise. Matches human hearing sensitivity and is required for OSHA and NIOSH compliance measurements. C-Weighting (dBC): Ideal for measuring low-frequency noise and peak sound levels. Commonly used in entertainment venues and for assessing hearing damage risk. Z-Weighting (Flat): Unweighted measurement providing the true acoustic energy across all frequencies. Essential for acoustic research and audio production. PRECISION MEASUREMENT TOOLS Fast and Slow Response: Toggle between 125ms fast response for capturing transient sounds and 1-second slow response for steady-state noise measurement. Nine Measurement Ranges: Select from ranges spanning 30dB to 130dB to optimize display resolution for your specific environment, from quiet recording studios to loud industrial settings. Peak Hold and Statistics: Track minimum, maximum, peak, and Leq (equivalent continuous sound level) values throughout your measurement session. Real-Time Spectrum Analyzer: Visualize sound energy distribution across 31 frequency bands with the built-in 1/3 octave spectrum analyzer. Identify problematic frequencies and analyze acoustic characteristics. CALIBRATION AND ACCURACY SPL Meter includes device-specific calibration profiles optimized for each iPhone and iPad model. For maximum accuracy, perform manual calibration against a reference sound level meter using the built-in calibration tool. The app applies frequency compensation for internal microphones and supports external measurement microphones for professional applications. NOISE EXPOSURE MONITORING Protect your hearing with integrated noise dose calculation based on NIOSH recommended exposure limits. The app tracks your cumulative noise exposure over time and alerts you to potentially harmful sound levels: Safe (Green): Below 70 dBA - No hearing damage risk Caution (Yellow): 70-85 dBA - Prolonged exposure may cause damage Danger (Red): Above 85 dBA - Hearing protection recommended SESSION RECORDING AND EXPORT Record measurement sessions and review your data with detailed graphs showing SPL variations over time. Export your measurements as CSV or JSON files for further analysis, reporting, or compliance documentation. RT60 REVERBERATION MEASUREMENT Measure room acoustics with the built-in RT60 measurement tool. Analyze decay time to evaluate acoustic treatment effectiveness, optimize studio acoustics, or assess venue sound quality. DESIGNED FOR PROFESSIONALS SPL Meter is built for users who demand accuracy and reliability. The analog needle meter provides intuitive visual feedback familiar to audio professionals, while the digital display delivers precise numerical readings. Perfect for: - Occupational health and safety assessments - OSHA and NIOSH noise surveys - Live sound engineering - Studio acoustic analysis - Environmental noise monitoring - Hearing conservation programs - Venue noise compliance - Home theater calibration - Musical instrument practice monitoring PRIVACY FOCUSED All audio processing occurs locally on your device. No recordings are transmitted or stored externally. Your measurement data remains private and under your control. Download SPL Meter today and get professional sound measurement capabilities in your pocket. Privacy Policy: https://audiomillo.com/privacy Terms of Service: https://audiomillo.com/eula