Free Online Tone Generator Alternative
Online tone generators play audio at a specified Hz. If you need to look up which note corresponds to which frequency for production, EQ, or tuning workflows, BeatKey Note Frequency Calculator is the dedicated free reference tool.
The Core Difference
Online Tone Generator
Plays a sine wave at a Hz value you set. Useful for testing speakers, hearing protection checks, or identifying resonances by ear. Does not show a comprehensive note frequency chart or integrate with production workflows.
BeatKey Note Frequency Calculator
A reference lookup tool that shows the Hz value for any of 128 MIDI notes. Find the note for a frequency, find the frequency for a note, look up MIDI numbers, and use the 808 Tuning Guide for production-specific workflows. No audio output needed.
Feature Comparison
| Feature | BeatKey Note Freq | Online Tone Generator |
|---|---|---|
| Price | Free | Free |
| Account required | No | No |
| Primary purpose | Note Hz reference chart | Play audio tones at specified Hz |
| Audio output | No (reference only) | Yes (core feature) |
| Full 128-note chart | Yes | No |
| Note name to Hz lookup | Yes | Hz to audio only |
| MIDI note numbers | Yes | No |
| 808 tuning workflow | Yes | No |
| EQ frequency reference | Yes | No |
| Works silently (no speakers needed) | Yes | No |
| Production workflow integration | Yes | No |
| BPM + key detection link | Yes | No |
Common Note Frequencies Quick Reference
| Note | Frequency (Hz) | Common Use |
|---|---|---|
| A0 | 27.50 Hz | Lowest piano note, extreme sub bass |
| C2 | 65.41 Hz | Deep bass, synth sub bass range |
| E2 | 82.41 Hz | Bass guitar open E string |
| A2 | 110.00 Hz | Bass guitar open A, 808 sweet spot |
| C3 | 130.81 Hz | Standard bass range, kick drum fundamental |
| A3 | 220.00 Hz | Lower guitar range, tenor vocal |
| C4 | 261.63 Hz | Middle C, standard reference note |
| A4 | 440.00 Hz | Concert A, universal tuning standard |
| C5 | 523.25 Hz | Upper piano melody range |
| A5 | 880.00 Hz | Violin/synth lead range |
Production Use Cases
808 and bass drum tuning
Find the Hz for the root note of your track (e.g., A1 = 55 Hz) and pitch your 808 sample to match. Tone generators play a tone; they cannot set a pitch parameter in your DAW. BeatKey gives you the number you need.
Musical EQ decisions
Set EQ bands at musically meaningful frequencies. Boost the fundamental of a bass guitar at E2 = 82 Hz. Cut the honky midrange at D4 = 294 Hz. BeatKey makes EQ decisions musically precise.
Oscillator and synth tuning
Setting a synth oscillator to a specific pitch in a DAW requires knowing the Hz. BeatKey shows the exact Hz for any note so you can enter it as an oscillator frequency parameter.
No speakers needed
BeatKey Note Frequency Calculator is a visual reference only. It does not play audio, so you can use it silently in any environment, including public places, studios with monitoring restrictions, or when you need a quick lookup without disturbing others.
Open Note Frequency Calculator Free
128 notes, Hz values, MIDI numbers. No audio output, no account.
Open Note Frequency Calculator