Tap the bowl to strike it, or drag your finger or mouse in circles around the rim to make it sing, just like rubbing a real bowl with a mallet. Choose one of seven pitches and a bowl size, set how long it rings, and let it strike on a loop for meditation or a quiet sound bath.
Last updated:
C3130.8 HzTap the bowl to strike it
Pitch (7 bowls)
Keys: 1–7 pick and strike a bowl, Space strikes, R toggles the rim rub, Esc stops.
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How to use the Virtual Singing Bowl
Pick a pitch from the seven bowls (C to B) and a bowl size. Each button also plays the bowl once so you can hear it.
Strike the bowl: tap or click inside it, press Space, or use the Strike bowl button. Tapping near the rim gives a stronger strike.
Rub the rim: press and drag in slow, steady circles around the bowl. The tone swells as you keep circling, or press Start rim rub to let the tool do it.
Set the sustain and mallet to change how long each strike rings and how bright it sounds.
Turn on Loop to strike automatically every few seconds, choose a session length, and press Stop all (or Esc) to end.
The seven bowl pitches
Frequencies use standard equal temperament with A4 = 440 Hz. The colors and chakra names are the modern convention used for seven-bowl sets, shown as a label only.
Key
Note
Large bowl (octave 2)
Medium bowl (octave 3)
Small bowl (octave 4)
Common chakra label
1
C
65.4 Hz
130.8 Hz
261.6 Hz
Root (red)
2
D
73.4 Hz
146.8 Hz
293.7 Hz
Sacral (orange)
3
E
82.4 Hz
164.8 Hz
329.6 Hz
Solar plexus (yellow)
4
F
87.3 Hz
174.6 Hz
349.2 Hz
Heart (green)
5
G
98.0 Hz
196.0 Hz
392.0 Hz
Throat (blue)
6
A
110.0 Hz
220.0 Hz
440.0 Hz
Third eye (indigo)
7
B
123.5 Hz
246.9 Hz
493.9 Hz
Crown (violet)
Why a singing bowl sounds the way it does
A singing bowl is a bell that stands on its base. When it vibrates, the rim flexes into an oval that bends back and forth; higher modes bend it into three, four and five lobes. Because a bowl is not a string or a pipe, these modes are not whole-number harmonics. On typical hand-hammered bowls the second mode sits around 2.7-2.9 times the fundamental and the third around 5.1-5.5 times, which gives the shimmering, bell-like color.
The famous slow "wah-wah" pulse comes from small irregularities in the metal: each mode is split into two very close frequencies, and the two beat against each other a few times per second or slower. This tool recreates that by pairing two slightly detuned sine waves for every mode, with the higher modes fading faster than the fundamental, just as they do on a real bowl.
Tips for rubbing the rim
Go slow and steady. About one circle per second is plenty. On a real bowl, rushing or pressing too hard makes the mallet rattle against the rim.
Strike first, then rub. Players often tap the bowl gently and then start circling, so the tone is already sounding and the rub just keeps it going.
Let it ring out. When you stop rubbing, lift the mallet away and listen to the tone fade. Set the sustain to 30-60 seconds for a long, slow decay.
Use headphones. The large bowl's fundamental (65-125 Hz) is below what most phone and laptop speakers can play; you will mostly hear its overtones on small speakers.
Keep the volume comfortable. The rim rub builds up gradually, so start with the volume around half and adjust once the bowl is singing.
Frequently asked questions
How does the virtual singing bowl make its sound?
The sound is synthesized live with the Web Audio API, not played from a recording. A real bowl vibrates in several modes at once, with overtones at roughly 2.7-2.9, 5.1-5.5 and 8.2-8.9 times the fundamental rather than whole-number multiples. The tool builds each of those modes from two sine waves a few tenths of a hertz apart, which produces the slow pulsing beat you hear in a real bowl, and lets every mode fade at its own rate.
What is the difference between striking and rubbing the rim?
Striking excites all the modes at once, so you hear a bright attack that settles into the low hum. Rubbing a mallet around the rim feeds energy in continuously through friction (stick-slip motion), which mainly builds up the lowest modes, so the tone grows slowly and can be held as long as you keep circling. In this tool, faster circles make the bowl sing louder, and when you stop it rings out naturally.
Which notes and frequencies does it play?
Seven pitches, C, D, E, F, G, A and B, tuned to standard equal temperament with A4 = 440 Hz. The medium bowl uses octave 3 (C3 = 130.8 Hz up to B3 = 246.9 Hz), the large bowl octave 2 and the small bowl octave 4. Real hand-made bowls are rarely tuned exactly to a note; manufacturers usually name the nearest one.
Why are the notes linked to chakra colors?
In modern sound-healing practice, sets of seven bowls are often sold with each note paired to one of the seven chakras, from C (root, red) to B (crown, violet). The colored dots follow that common convention as a label only. It is a modern tradition, not a scientific or historical standard.
Can I use it for meditation or a sound bath?
Yes. Turn on Loop, choose a strike interval of 10-20 seconds and a session length, and the bowl strikes on its own until the timer ends and the last strike fades. You can also start the rim rub for a continuous drone. Headphones or good speakers bring out the low hum that small phone speakers cannot reproduce.
Can I download the bowl sound?
Yes. Download strike as WAV renders one strike with your current pitch, size, mallet and sustain to a stereo 44.1 kHz, 16-bit WAV file, made on your own device. You can use it in videos, timers or meditation recordings.
Does the bowl keep playing if I switch tabs?
The loop and the auto rim rub keep running while the page is open, including in a background tab, as long as your browser keeps the tab active. Some phones pause audio when the screen locks, so keep the screen on for long sessions.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.