NoteLab Toolbox

NoteLab Toolbox is a collection of offline music theory calculation tools designed for musicians, students, and anyone who needs quick access to musical calculations.

Features:

Note Frequency Helper
Calculate the frequency of any note in any octave. Adjust A4 reference frequency (432 Hz, 440 Hz, 442 Hz, 444 Hz, or custom). View harmonics and transpose notes easily.

Chord Inverter
Select any root note and chord type to see the chord notes and all inversions. Visual representation shows active notes on a 12-note circle. Transpose chords and save favorites.

Tempo Tap Tool
Tap to calculate BPM with accuracy. View stability percentage and interval chart. Lock BPM values and access history of previous calculations.

Key Features:
- Completely offline - no internet connection required
- No permissions needed - works without microphone, storage, or network access
- Lightweight and fast
- Clean, simple interface
- Save favorite notes and chords
- Recent notes history
- Customizable A4 reference frequency
- Adjustable decimal precision

Perfect for:
- Musicians calculating note frequencies
- Students learning music theory
- Songwriters working with chord progressions
- Anyone needing quick tempo calculations

All calculations are performed locally on your device. Your data stays private and secure.