Best SPL Meter Apps 2026
SPL Meter App Comparison
| Feature | SonaVyx | NIOSH SLM | AudioTools | dB Meter Pro | Decibel X |
|---|---|---|---|---|---|
| Platform | Any browser | iOS | iOS | iOS/Android | iOS/Android |
| A/C/Z Weighting | All three | A/C | A/C/Z | A/C | A/C |
| Time Weighting | Fast/Slow/Impulse | Slow | Fast/Slow | Fast/Slow | Fast |
| Leq / LAeq | Yes | Yes | Yes | Yes | Yes |
| L10/L50/L90 Statistics | Yes | Yes | Yes | No | No |
| Octave Band Analysis | 1/1 and 1/3 octave | No | Yes ($) | No | No |
| NC/NR Curves | Yes | No | Yes ($) | No | No |
| Noise Dose / TWA | Yes (OSHA + ISO) | Yes (OSHA/NIOSH) | Yes ($) | No | No |
| Data Logging | Yes (CSV export) | Yes | Yes | Yes | Yes |
| Calibration | 94dB reference | External mic | External mic | Basic | Basic |
| Price | Free | Free | $29.99+ | $3.99 | Free (ads) |
| IEC 61672 Compliance | Class 2 equivalent | Validated | Class 2 | No | No |
SonaVyx SPL Meter
SonaVyx delivers a full IEC 61672-1 Class 2 equivalent SPL meter in any web browser. It supports A, C, and Z frequency weighting with Fast, Slow, and Impulse time constants. The statistical analysis engine calculates L10, L50, and L90 percentiles using a 0.1dB resolution histogram. Octave band analysis in both 1/1 and 1/3 octave resolution with NC and NR curve comparison sets it apart from most mobile apps. The noise dose calculator covers both OSHA (5dB exchange rate) and ISO/NIOSH (3dB exchange rate) standards. All of this runs free in your browser with CSV data export.
NIOSH Sound Level Meter
Developed by the National Institute for Occupational Safety and Health, this iOS app is specifically designed for workplace noise assessment. It has been laboratory-validated and provides reliable TWA and dose calculations. Its limitation is iOS-only availability and lack of octave band analysis. Best for occupational health professionals who need OSHA-compliant field measurements.
AudioTools by Studio Six Digital
AudioTools is the most comprehensive iOS measurement suite, bundling SPL meter, RTA, FFT, signal generator, and more as in-app purchases. Professional-grade with external microphone support. The total cost of all modules exceeds $100, making it the most expensive option. Best for iOS users who want a single app ecosystem.
dB Meter Pro and Decibel X
Both are simple SPL meter apps suitable for casual noise level checks. They lack advanced features like statistical percentiles, octave analysis, and standards compliance. dB Meter Pro costs $3.99 while Decibel X is ad-supported free. Neither is suitable for professional measurement or compliance documentation.
Choose the Right SPL Meter
- Choose SonaVyx if you want comprehensive SPL measurement with octave bands, statistics, and noise dose — all free in a browser.
- Choose NIOSH SLM if you need OSHA-validated workplace noise assessment on iOS.
- Choose AudioTools if you want a professional iOS measurement suite and are willing to pay for modules.
- Choose dB Meter Pro or Decibel X if you just need a quick casual noise level check.
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