FreqHead

An offline dictionary for people who listen.

FreqHead is a focused offline audio dictionary built for listeners, hobbyists, engineers, reviewers, and professionals who want clear definitions without distraction. Whether you are evaluating IEMs, comparing DACs, working in a studio, or simply deepening your understanding of sound, FreqHead gives you reliable audio knowledge instantly with no internet required. It covers foundational and advanced audio concepts across acoustic principles, transducer behavior, signal chain fundamentals, technical performance characteristics, critical listening vocabulary, and audio engineering terminology. The interface is intentionally minimal. No ads, no banners, no popups, no accounts, no tracking. Just terms, definitions, and focus.

Features

Audio terminology dictionary
Brand Catalog
Daily term of the day
Level and progress tracking
Favorites and recently viewed
Sound Journal with daily quote
Instant search with recent history
Share any term as a card
Light, dark, and system themes
Fully offline, no account required
Complete privacy, nothing collected

How to use

Discover a new audio term daily and grow your knowledge step by step. Find any term in real time with fast, responsive search, and revisit recent searches instantly. Mark terms as learned and advance through five levels, Listener, Enthusiast, Audiophile, Purist, and Expert. Save important terms to Favorites, explore the Brand Catalog of IEMs, headphones, DACs, amplifiers and more, and share any term as a clean branded card with a single tap. Record listening notes privately in the Sound Journal, paired with a daily audio quote. Switch between light, dark, or system theme instantly. Everything stays on your device, nothing is collected or transmitted.