Tracebook vs ARCQ SPL

Tracebook is an independent public non-profit community that promotes the open exchange of loudspeaker system reference data measured by audio professionals for audio professionals. The app is an iOS version of the Tracebook website found at https://trace-book.org. The reference data includes: • Magnitude • Phase • Coherence • Measurement details

SPL Meter turns your iPhone or iPad into a precision sound pressure level meter for musicians, audio engineers, AV techs, and anyone who needs to know how loud it really is. Built around real-time A- and C-weighted measurement, SPL Meter shows the readings the pros actually use — not a single number, but a full panel of simultaneous metrics. MEASUREMENTS • LAS / LCS — A- and C-weighted level with SLOW or FAST time weighting • LAeq / LCeq — equivalent continuous level over your chosen averaging window • LCpeak — true C-weighted peak, instant and max-hold • TWA — time-weighted average for noise-exposure style monitoring • Instant, average, and max-hold values side by side LIVE SPECTRUM • Real-time octave-band spectrum analyzer • Drag across the display to read the level at any frequency • Double-tap to expand for a full-screen view FLEXIBLE INPUT • Use the built-in microphone or any connected USB, Bluetooth, or headset input • Multi-channel interfaces supported — pick the exact input channel • A/B capture: freeze two readings and see the difference DESIGNED FOR REAL WORK • Choose your averaging window to suit the room and the source • Custom thresholds and profiles • Clean, high-contrast layout that reads at a glance on stage or in the field • Universal — optimized for both iPhone and iPad PRIVATE BY DESIGN SPL Meter does all processing on-device. Audio is never recorded, saved, or transmitted. There are no accounts, no analytics, no tracking, and no ads. A NOTE ON ACCURACY Like any phone-based meter, readings depend on your device's microphone and are not a substitute for a calibrated Class 1/2 sound level meter for compliance work. SPL Meter is a powerful, consistent tool for monitoring, comparison, and setup — not a certified measurement instrument.