Getting started

The screenshot is from before the 2026-09-30 release; the band, fader, wavelength and A4 buttons are not in it yet.

PitchSense is one page of panels. Everything on it is calculated from the A4 reference at the top, so set that first if your ensemble does not tune to 440 Hz.

Quick start

1. Open PitchSense from the dashboard.
2. In Hz → Note, type the frequency you are hunting — say 315. The panel shows the nearest note, its exact frequency, its MIDI number and a cents gauge that tells you how sharp or flat 315 Hz is from that note. Below it you see the ISO band, the GEQ fader and the wavelength — see The engineer's view.
3. Tap the play button next to the field to hear it, or hold the drone to keep the tone sounding. Wave and Volume set the tone shape and level.
4. In Note → Hz, pick a note and an octave to go the other way.
5. Scroll to the Reference Table and type a note, a MIDI number or a frequency into the search box to find any row from C0 to B8.

Numbers take a decimal comma or a point: 440,5 and 440.5 are the same.

The A4 reference

Tap 440, 442, 443, 415 or 432 Hz, or type any other value into the field next to the buttons. 440 Hz is the default. Changing it re-derives every readout, every harmonic and every row of the table, and the formula line at the bottom of the page updates to match. Your choice is remembered between visits and, when you are signed in, syncs to your other devices.

A4 from a shared link is used for that visit only and never replaces your own setting — see Share or bookmark a readout.

Hz → Note

Type any frequency from 1 to 25 000 Hz. The panel shows the nearest note with its octave, that note's exact frequency and MIDI number, and a cents gauge from −50 to +50. Within ±5 cents the readout says in tune; outside it says sharp or flat with the deviation to one decimal. An empty field shows a neutral prompt, not a reading.

Note → Hz

Choose a note (sharps spelled with ♯) and an octave from 0 to 8. The panel shows the frequency to two decimals, the MIDI number, and whether the result sits in the 20 Hz to 20 kHz audible range.

Playback and the drone

Every value has a play button: both converters, the harmonic fundamental, each harmonic card, the kick-to-key table and every row of the reference table. A tap plays a short tone; overlapping taps are smoothed so they do not clip. The drone keeps the reference sounding until you stop it — for tuning by ear or singing against.

• Wave — Sine (default), Triangle, Square or Saw.
• Volume — 0 to 100, default 25.

Both are remembered along with the A4 reference.

Harmonic Series

Type a fundamental (default 110 Hz, up to 5 000 Hz) and the grid shows the first eight partials, ×1 to ×8, each with its frequency, nearest note and cents deviation. Each card has its own play button. The 7th partial of 110 Hz, 770 Hz, sits 31 cents flat of G5 — that is physics, not a bug.

Reference Table

Every note from C0 to B8 — 108 rows, MIDI 12 to 119 — with octave, MIDI number and frequency to four decimals; the A4 row is highlighted. Search accepts note names in either spelling (C#4, Db4, F♯, Eb), a MIDI number (69), or the start of a frequency (440, 261.6). The counter beside the box shows how many rows match.

Languages and note names

PitchSense follows the platform language you pick in the top bar — 11 languages. In German the notes use German names: H is the international B, and B is B♭. A setting switches the note names to Do-Ré-Mi (Do, Ré, Mi, Fa, Sol, La, Si) for anyone who learned them that way. See Languages.

Live Tuner

Start listening turns on the microphone reading. It has its own page: Name a note from the microphone.

Next

• The engineer's view — band, fader, wavelength and the kick-to-key table.
• Share or bookmark a readout — the readout lives in the URL; send it or bookmark it.
• FAQ — cents, temperament and accuracy.