AudioEngineerKit: SPL & RTA

Professional SPL meter and 31-band RTA in one app. Mic calibration, A/C weighting, LUFS, RT60, Delay Finder and more — every measurement tool you need on site.

SPL Meter & RTA is a precision measurement toolkit built for sound engineers working on site.

Free • Real-time SPL (sound pressure level) meter — A/C weighting, dB • 31-band RTA (real-time analyzer) — ISO 266 standard center frequencies • Microphone calibration • Room Mode Calculator

Unlock Pro (one-time purchase) • LUFS loudness meter (BS.1770-4, Integrated/Short-term, target LU delta) • RT60 reverberation time analysis • Delay Finder — ESS sweep-based speaker alignment distance/time • Polarity Checker — passive & active modes, A/B speaker comparison • THD+N Analyzer • Loopback Test — pink-noise RTA-style report • External microphone support • SPL threshold alerts & measurement history (session log) • Dashboard view (SPL + RTA at a glance)

A universal app for iPhone, iPad, and Mac. Runs entirely on-device with no internet connection required — no accounts, no ads, no analytics, so your privacy stays yours.