Feedback Trainer vs AudioEngineerKit

A frequency ear training app for PA engineers and audio professionals. The ability to quickly identify problem frequencies that cause feedback is a skill built through experience. Train your ears with this app and sharpen your instincts for the stage and studio. Features Visual learning with a 31-band graphic EQ display Two modes: Phone-Friendly (100Hz–16kHz) and Full Range for external speakers (40Hz–16kHz) Hint mode for beginners Track your accuracy and progress history Available in Japanese, English, Chinese, French, and Spanish

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 • Feedback detector (new) — spots acoustic feedback live and suggests the frequency and GEQ band to cut (for reference only; the first 3 detections of each session show the frequency) 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) • Feedback sound check — collect the frequencies that ring before the show, save them by venue and share (for reference only) 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.