432 Hz Guitar Tuner

Project Overview

432 Hz Guitar Tuner is a professional-grade chromatic tuner designed for musicians who want both technical accuracy and flexibility in tuning standards. While optimized for guitar, the tuner works with any instrument and functions fully offline.

The app's core differentiator is its support for three distinct tuning references - standard modern tuning, alternative tuning, and scientific pitch - presented in a clean, musician-first interface with clear educational context.

Tuning Standards Supported

• 440 Hz - The modern industry standard used in most contemporary music
• 432 Hz (Verdi tuning) - A popular alternative tuning reference advocated by Giuseppe Verdi
• 430.54 Hz Scientific Pitch - A mathematically derived system placing middle C at 256 Hz

Users can switch instantly between standards, with all pitch detection recalculated in real time.

Core Features

• High-precision chromatic pitch detection (±1 cent accuracy)
• Guitar-first interface with automatic string detection (E A D G B E)
• Chromatic tuning support for any instrument
• Low-latency, real-time visual feedback
• Clear needle-style tuning display with color-coded accuracy
• Dark mode and minimalist professional UI
• Works completely offline with no account required

Educational Content

The app includes a dedicated learning section explaining tuning standards in a factual, balanced way.

• What 432 Hz tuning is and how it differs from 440 Hz
• The historical background of Verdi tuning
• An explanation of scientific pitch and middle C = 256 Hz
• A brief history of how modern tuning standards evolved
• How to use the tuner effectively for best results

Who It's For

• Guitarists exploring alternative tuning standards
• Musicians who want a reliable chromatic tuner
• Players interested in the theory and history of tuning
• Anyone seeking a clean, distraction-free tuning tool

Technical Implementation

• Platform: Native iOS (iPhone and iPad)
• Framework: SwiftUI
• Audio: AVFoundation with real-time pitch analysis
• Architecture: MVVM
• Performance: Battery-efficient, low-latency processing
• Privacy: No unnecessary permissions or data collection

Design Philosophy

The interface is intentionally minimal and professional. Subtle visual accents inspired by harmonic and geometric themes are used sparingly, ensuring the app feels like a serious tool first, with aesthetic character as a secondary enhancement.

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