Verdict: For most audio professionals in 2026, the best measurement software depends on workflow priority. SonaVyx leads for accessibility and AI-powered diagnostics. Smaart v9 remains the gold standard for multi-channel live sound. REW is the best free desktop option for room acoustics. This guide compares all six major platforms across 12 key criteria.
| Feature | SonaVyx | Smaart v9 | REW | OSM | SATlive | ARTA |
|---|---|---|---|---|---|---|
| Price | Free / $29/mo Pro | $895 one-time | Free (donationware) | Free (open-source) | €30 one-time | Free |
| Platform | Browser (any device) | Windows / macOS | Windows / macOS / Linux | Windows / macOS / Linux | Windows | Windows |
| RTA / Spectrum | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Transfer Function | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| RT60 / Reverberation | ✓ | ✗ | ✓ | ✗ | ✗ | ✓ |
| SPL Meter | ✓ | ✓ | ✓ | ✗ | ✓ | ✗ |
| STI Measurement | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| AI Diagnostics | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Mobile Support | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Multi-Channel | 2-ch (WebSocket) | Up to 64-ch | 2-ch | 2-ch | 2-ch | 2-ch |
| No Install Required | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Standards Compliance | IEC 61672, ISO 3382, IEC 60268-16 | IEC 61672 | ISO 3382 | — | — | ISO 3382 |
SonaVyx is the only professional audio measurement platform that runs entirely in a web browser. Built on Rust WebAssembly for near-native DSP performance, SonaVyx provides dual-channel FFT transfer function analysis, RTA with 1/1 to 1/24 octave smoothing, IEC 61672-compliant SPL metering, ISO 3382 RT60 measurement, and IEC 60268-16 STI testing. The free tier includes all core measurement tools with no time limits.
Unique strengths: AI-powered diagnostics using Claude analyze measurement data and provide specific EQ, delay, and level recommendations. Camera-based equipment scanning identifies loudspeakers and processors. Multi-device WebSocket measurement enables two-phone transfer function analysis without an audio interface. All processing runs client-side via WASM, meaning measurements work offline after the initial page load.
Limitations: Maximum two-channel measurement (via WebSocket pairing). Smartphone MEMS microphones achieve Class 2 accuracy, not Class 1. No deep hardware integration with Lake, Dante, or BSS processors. New platform without the decades-long track record of established tools.
Rational Acoustics Smaart has been the industry standard for live sound system measurement since the late 1990s. Smaart v9 supports up to 64 simultaneous input channels, integrates directly with professional audio interfaces, and provides the real-time dual-channel FFT analysis that system engineers rely on for concert tours, festival installations, and permanent venue commissioning.
Unique strengths: Multi-channel capability (64+ inputs), API Mode for third-party automation, deep integration with Lake, Dante, and BSS ecosystems, battle-tested reliability across thousands of major live events, extensive training ecosystem through Rational Acoustics and third-party educators.
Limitations: $895 price plus $300-$1,500 for a compatible audio interface. Desktop-only (Windows/macOS), no mobile version. No built-in RT60, STI, or AI diagnostics. No cloud-based reporting or venue management.
REW is the most popular free audio measurement software, particularly strong for room acoustics analysis. Originally focused on home theater and hi-fi room optimization, REW has grown into a comprehensive measurement platform supporting RTA, transfer function, impulse response, RT60, waterfall plots, and automated room EQ generation for systems like miniDSP and Dirac.
Unique strengths: Completely free with no feature restrictions. Excellent room acoustics tools including waterfall plots, spectrogram, and room simulation. Cross-platform (Windows, macOS, Linux). Large community with extensive documentation and forum support. Auto-EQ generation for popular DSP hardware.
Limitations: Java-based UI can feel dated. Real-time transfer function is less refined than Smaart. No mobile version. No AI diagnostics. Primarily designed for room acoustics rather than live sound system alignment.
Open Sound Meter (OSM) is a free, open-source dual-channel FFT analyzer designed for live sound system measurement. Created by Pavel Khlebovich, OSM focuses on real-time transfer function analysis with a clean, modern interface. It positions itself as a lightweight alternative to Smaart for engineers who primarily need dual-FFT capability.
Strengths: Free and open-source. Clean, modern UI. Fast real-time transfer function. Low CPU usage. Limitations: No SPL meter, RT60, STI, or room acoustics tools. No AI features. Limited export options. Small development team. Windows, macOS, and Linux only.
SATlive is a dual-channel FFT analyzer from Germany, popular among European system technicians. At \u20ac30, it offers excellent value for live sound measurement with features including real-time transfer function, delay finder, and multi-trace overlay. SATlive is particularly strong in the German-speaking market.
Strengths: Very affordable (\u20ac30). Good real-time performance. Multi-trace overlay. Delay finder. Limitations: Windows-only. No RT60, STI, or room acoustics. Interface can feel complex for beginners. Limited English documentation. No AI features or mobile support.
ARTA (Audio Research and Test Application) is a free measurement suite from Croatian developer Ivo Mateljan. ARTA focuses on loudspeaker measurement and room acoustics, providing impedance measurement, Thiele-Small parameter extraction, directivity analysis, and RT60 measurement. It is widely used in the DIY loudspeaker community.
Strengths: Free with professional-grade loudspeaker measurement tools. Impedance and T/S parameter extraction. Good for speaker design and room acoustics. Limitations: Windows-only. Dated interface. Steep learning curve. No real-time live sound transfer function. No AI features or mobile support.
Choose SonaVyx if: you want browser-based measurement on any device, AI-powered diagnostics that explain your results, free core tools with no installation, or multi-device measurement without an audio interface.
Choose Smaart if: you need 64+ channel measurement, deep integration with Lake/Dante/BSS processors, API Mode automation, or your workflow requires the industry-standard tool that touring companies expect.
Choose REW if: you focus on room acoustics and home theater optimization, need auto-EQ generation for miniDSP/Dirac, want a free desktop tool with comprehensive room analysis, or prefer a large community with extensive support.
Choose Open Sound Meter if: you want a free, open-source dual-channel FFT analyzer with a clean modern interface and minimal system resource usage for basic live sound transfer function measurement.
Choose SATlive if: you are a European system technician looking for an affordable (\u20ac30) dual-channel FFT analyzer with good real-time performance and multi-trace capability on Windows.
Choose ARTA if: you design or build loudspeakers and need impedance measurement, Thiele-Small parameter extraction, and directivity analysis in a free Windows application.
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Try SonaVyx free in your browser — RTA, transfer function, SPL, RT60, and AI diagnostics with no download.