Verdict: SonaVyx is the best free RT60 measurement tool for browser-based access with ISO 3382 compliance, AI-powered interpretation, and acoustic treatment recommendations. REW is the best free desktop alternative with waterfall plots. For formal regulatory compliance requiring Class 1 accuracy, the NTi XL2 remains the reference instrument.
RT60 (reverberation time) measurement is essential for room acoustics evaluation, acoustic treatment design, and building code compliance. This comparison evaluates the best RT60 measurement tools across accuracy, ISO 3382 compliance, platform support, and additional capabilities.
| Feature | SonaVyx | REW | ARTA | FuzzMeasure | NTi XL2 | Dirac |
|---|---|---|---|---|---|---|
| Price | Free | Free | Free | $199 | $3,500+ | $349 |
| Platform | Browser | Win/Mac/Linux | Windows | macOS | Hardware | Win/Mac |
| ISO 3382 Compliance | ✓ | ✓ | ✓ | Partial | ✓ (Class 1) | ✓ |
| T20 / T30 / EDT | ✓ | ✓ | ✓ | T30 only | ✓ | ✓ |
| Sweep Excitation | ✓ (Farina) | ✓ | ✓ | ✓ | ✓ | ✓ |
| MLS Excitation | ✓ | ✗ | ✓ | ✗ | ✗ | ✗ |
| Schroeder Integration | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| C50 / C80 / D50 / Ts | ✓ | ✓ | ✓ | ✗ | ✓ | ✗ |
| INR Validation | ✓ (35/45 dB) | ✓ | ✗ | ✗ | ✓ | ✗ |
| AI Interpretation | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Mobile | ✓ | ✗ | ✗ | ✗ | Handheld | ✗ |
| Treatment Advisor | ✓ | ✗ | ✗ | ✗ | ✗ | Correction |
SonaVyx provides comprehensive ISO 3382-1 RT60 measurement in a browser with no installation. The measurement engine generates log sine sweeps (Farina method) and supports MLS excitation for challenging environments. Schroeder backward integration extracts T20, T30, and EDT with linear regression and r-squared validation. Room acoustic parameters C50, C80, D50, Ts, and sound strength G are calculated from the impulse response.
What sets SonaVyx apart is the AI diagnostic engine that interprets RT60 results in context, comparing against room type targets and recommending specific acoustic treatment. The built-in treatment calculator predicts post-treatment RT60 using Sabine and Eyring equations with a 55-material absorption database. INR validation ensures measurement quality per ISO 3382 thresholds.
REW provides excellent RT60 measurement on desktop with waterfall plots and spectrogram visualization that SonaVyx does not yet match. REW\u2019s room simulation and auto-EQ generation for miniDSP and Dirac hardware make it the strongest desktop choice for room optimization. REW supports ISO 3382 with T20, T30, EDT, and C50/C80. Cross-platform on Windows, macOS, and Linux.
ARTA combines RT60 measurement with loudspeaker analysis tools (impedance, T/S parameters, directivity). This makes ARTA uniquely useful for speaker designers who need to characterize both the speaker and the room. Windows-only with a steep learning curve, but free and comprehensive.
The NTi Audio XL2 ($3,500+) is a precision handheld sound level meter with built-in RT60 measurement. The XL2 provides Class 1 IEC 61672-1 compliance with traceable calibration. Required for formal building code compliance testing, environmental noise permits, and contractual commissioning documentation where software-based measurements are not accepted.
Choose SonaVyx if: you want free RT60 measurement accessible from any device, AI interpretation of results, acoustic treatment recommendations, and additional measurement tools (RTA, TF, SPL, STI) in one platform.
Choose REW if: you need waterfall plots, room simulation, and auto-EQ generation for miniDSP or Dirac on a desktop platform.
Choose NTi XL2 if: you perform formal acoustic commissioning requiring Class 1 accuracy, traceable calibration certificates, and legally recognized measurement documentation.
Choose ARTA if: you combine speaker design work with room measurement on Windows.
Try It Now
Measure RT60 with SonaVyx \u2014 ISO 3382 compliant, AI-interpreted, with treatment recommendations. Free in your browser.