Guitar Tuner H8 - A4 440Hz Pro
Sze Kwok Cheung
About this app
- Category Music
- Age 10
- Updated Nov 17, 2025
- OS IOS
Editor reviews
Guitar Tuner H8 - A4 440Hz Pro is a fast, accurate guitar tuner app for guitar, bass, ukulele, and other string instruments. It delivers a clear needle and strobe-style display, chromatic detection, and a stable A4 440Hz reference with adjustable calibration for any performance or practice setting. Ideal for beginners and pros who need a reliable, easy-to-use tuner on stage, in the studio, or at home.
Key features
- Chromatic tuner with high precision and instant pitch tracking
- A4 440Hz reference with flexible calibration to match other instruments
- Presets for popular tunings plus clear visual guidance and reference tones
Keywords Guitar tuner app, 440Hz, chromatic tuner, instrument tuner, alternate tunings, pitch pipe, pro tuning
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How to use:
1. Install and open the app, then grant microphone access for accurate pitch detection.
2. Select your instrument and a tuning preset, or switch to Chromatic mode for any note.
3. Pluck a string and watch the needle or strobe; tighten or loosen until the indicator centers and shows in tune.
4. Tap the A4 setting to adjust calibration if you need to match a non 440Hz reference.
5. Use the pitch pipe to play reference tones and verify tuning across strings or chords.