Free · in your phone's browser · nothing uploaded
Sound tools, one job each.
Free sound tools online: a tone generator, a note frequency chart, a note finder for any sound, a chord transposer and a wine glass tuner. They run in your phone's browser, with no download and no account.
The resident makes the beat at night, in the app. By day these make tones and name notes.
Three of them only make sound and never touch the microphone. The two that listen, What note is this? and the wine glass tuner, open it when you tap and close it three seconds later. Nothing is recorded or uploaded.
Each ends in a door into Brumm, where the note or the chords become a melody over a running club track.
Which sound tool for which job
| You want to | Open | Microphone |
|---|---|---|
| Play one frequency, a test tone or a sweep, and save it as a WAV | Tone generator | No |
| Look up a note's frequency, MIDI number or wavelength | Note frequency chart | No |
| Name the note of a glass, a bowl, a kettle or a feedback ring | What note is this? | Yes, 3 s |
| Move a song's chords to another key, or to a B♭ or E♭ part | Transpose chords | No |
| Tune five glasses with water to a scale | Wine glass tuner | Yes, 3 s a tap |
| Find the root note of a sample or an 808 | Pitch detector | Yes, or a file |
| Measure your vocal range | Vocal range test | Yes |
| Turn a hummed line into MIDI or a synth part | Hum to MIDI | Yes |
| Tune an instrument | Tuners | Yes |
Looking for SoundTools, the stage boxes?
That is another company. SoundTools is the product line of Rat Sound Systems in Camarillo, California: stage boxes that run audio over CAT cable (the CAT Box, the WallCAT) and the XLR and NL4 Sniffer/Sender cable testers for touring crews. They are sold through Rat Sound and pro-audio dealers such as B&H and Rational Acoustics (Rational Acoustics, October 2026: XLR Sniffer/Sender $72, NL4 Sniffer/Sender $127). Two websites use the name too: sound-tools.net (a voice reverser, voice effects and binaural beats) and an AI suite for text to speech, vocal removal and stems. Brumm is none of them.
A sound map is something else: in the Tools of the Mind classroom programme it is an alphabet chart, each letter with a picture whose name starts with its sound, which children use to write words. A sound wall groups the speech sounds by how the mouth makes them. Both are phonics, for learning to read, not audio.
Sound tools for sound engineers
The tone generator keeps the line-up tones one tap away. 1 kHz is the alignment tone: European broadcasters line it up at −18 dBFS (EBU R68), American film and TV at −20 dBFS (SMPTE RP 155). The level on the page is yours to set; the WAV loop peaks at −6 dBFS, so take it down 12 dB in the DAW for an EBU tone.
Left, both or right sends the tone to one speaker or ear, to check that a cable, a stereo pair or a pair of headphones is wired the right way round. A sine tone can't tell you a speaker's polarity; that takes a pulse and a polarity tester.
A hum on 50 or 60 Hz is the mains: 50 Hz in Europe and most of the world, 60 Hz in North America, much of South America and western Japan; on 100 or 120 Hz it is the same mains after a rectifier, often a power supply. Musically, 50 Hz is a sharp G1 and 60 Hz sits between A♯1 and B1, which is why mains hum rarely sits in tune with a track.
A slow sweep finds where a room booms. The first mode between two parallel walls sits at the speed of sound over twice their distance: 343 m/s ÷ (2 × 4 m) ≈ 43 Hz in a four-metre room, with more at 86 and 129 Hz. Sweep 30 to 200 Hz over 30 seconds and note where the bass swells or something rattles. Play it through the PA, the monitors or a sub, with the phone on a cable or Bluetooth: a phone's own speaker plays almost nothing under a few hundred hertz.
Feedback is one note ringing. Tap What note is this? while it rings and you get its frequency in hertz, the place for a narrow EQ cut. It reads up to about 4 kHz.
Sound design: waveforms, and your own voice
The waveform sets the colour, not the pitch. A sine is the fundamental alone. A triangle adds the odd harmonics, falling fast: the third at a ninth of the amplitude (1/n²). A square has the same odd harmonics falling slowly, the third at a third (1/n). A saw has every harmonic at 1/n, which is why subtractive synths start their leads and pads from it.
Voice to instrument, without a keyboard: hum to synth lead, pluck, bell, acid line and bassline play a hummed melody on that sound; hum to MIDI downloads it as MIDI and WAVs. The vocal chop maker cuts a sung phrase into chops on pads.
Sound healing and sound bath tools: bowls, forks, 432 and 528 Hz
For sound healing, sound therapy or a sound bath, the tone generator holds any frequency from 20 Hz to 20 kHz for as long as the page stays on screen (it stops when you switch apps or the phone locks), and What note is this? names the note a bowl or a fork rings. A bowl sounds several tones at once that don't form a harmonic row, so struck and rubbed it can read as two different notes.
The frequencies people ask for, against the piano at A4 = 440 Hz:
- 432 Hz: A4, 31.8 cents flat (where it comes from: the 432 Hz tuner).
- 528 Hz: C5, 15.6 cents sharp.
- 256 and 128 Hz, the C's of the old scientific pitch that many forks are cut to: 37.6 cents under today's C4 and C3.
- 136.1 Hz, sold as the "Om" fork: C♯3, 31.4 cents flat.
The tools play and read pitch. What a frequency does to a body is not something they measure, and they claim nothing about it. They play one tone at a time, so no binaural beats (two tones a few hertz apart, one in each ear).
Sound measurement tools: decibel meters
There is no decibel meter here. A phone's microphone isn't calibrated and a browser may change its gain, so a dB figure in a web page is a guess. For noise at work or a venue's limit, use a sound level meter built to IEC 61672-1: class 1 for measurement that has to hold up, class 2 for the usual handheld one.
No spectrum analyser or oscilloscope here either; to read one note's frequency, What note is this? does it. If a phone app has to do: in a NIOSH test (Kardous and Shaw, Journal of the Acoustical Society of America, 2014), a few iPhone sound meter apps came within 2 dB(A) of a reference meter, and NIOSH later released its own free SLM app for iPhone. Android apps vary more.
Free sound editing and mixing tools
For sound editing (cutting and fading a recording, converting MP3 to WAV, noise reduction, mixing) you need an audio editor or a DAW, not these tools. The same goes for reversing or changing a voice, splitting a song into stems and text to speech. Audacity is free on Windows, macOS and Linux; GarageBand is free on a Mac, iPhone and iPad; on Android a free editor such as Lexis Audio Editor does cuts and fades. What these tools make goes into any of them: the tone generator and the note chart save WAV loops, the hum pages MIDI.
Questions
Do I need to download an app?
No. Every tool runs in the browser, on a phone or a laptop, with no install and no account. They don't work offline: the page needs a connection to open, and the listening tools fetch their reader on the first tap.
Is anything I record kept?
No. The sound is read in the browser and dropped; nothing is uploaded or stored. The site counts visits, not sounds (how).
Are these AI sound tools?
No AI generator here: nothing makes music or sound effects from a text prompt or a video, removes vocals or splits stems. The tools play and read pitch in the browser.
Found what you came for?
Noted.