Violin Tuner Online — A440 & A432
Tune with violin, guitar and orchestral reference tones in A440, A432 and 415 Hz plus solfeggio presets. Listening reference, no mic needed. Free in browser.
Protect your hearing. Start at a low volume. Never raise the volume to make a tone audible. Levels are shown in dBFS, relative to full scale — not SPL.
How it works
Pitch references are computed in client-side Web Audio using 12-Tone Equal Temperament relative to your selected reference standard (A4 = 400 Hz – 480 Hz). Tones offer warm harmonic filtering or pure sinusoids with smooth micro-fade envelopes to eliminate digital onset clicks.
Tune acoustic and electric instruments by ear with precision reference frequencies. Switch seamlessly between the international ISO 16 concert standard (A=440 Hz), Verdi’s scientific tuning (A=432 Hz), historical Baroque pitches, or meditative Solfeggio frequencies.
Standard Instrument String References (A4 = 440 Hz)
1. Acoustic & Electric Guitar (Standard EADGBE)
- 6th String (E2): 82.41 Hz
- 5th String (A2): 110.00 Hz
- 4th String (D3): 146.83 Hz
- 3rd String (G3): 196.00 Hz
- 2nd String (B3): 246.94 Hz
- 1st String (E4): 329.63 Hz
2. Electric Bass (Standard 4-String EADG)
- 4th String (E1): 41.20 Hz
- 3rd String (A1): 55.00 Hz
- 2nd String (D2): 73.42 Hz
- 1st String (G2): 98.00 Hz
3. Orchestral Strings (Violin, Viola, Cello)
- Violin (Tuned in 5ths): G3 (196.00 Hz), D4 (293.66 Hz), A4 (440.00 Hz), E5 (659.25 Hz)
- Viola: C3 (130.81 Hz), G3 (196.00 Hz), D4 (293.66 Hz), A4 (440.00 Hz)
- Cello: C2 (65.41 Hz), G2 (98.00 Hz), D3 (146.83 Hz), A3 (220.00 Hz)
Tuning by Acoustic Beats
When two sound waves of slightly different frequencies $f_1$ and $f_2$ are sounded simultaneously, interference produces a periodic modulation in amplitude known as acoustic beats:
$$f_{\text{beat}} = |f_1 - f_2|$$
If your guitar’s A string is at 108 Hz and the generator plays 110 Hz, you will hear a distinct pulse throbbing 2 times per second (2 Hz). As you tighten the tuning peg toward 110 Hz, the pulse slows down (1 Hz, 0.5 Hz) until the sound melts into a single unmoving tone.
Frequently asked questions
What is the difference between A440 and A432?
A440 (440 Hz) is the internationally adopted concert pitch standard ratified by the International Organization for Standardization (ISO 16 in 1955). A432 (432 Hz), advocated by Italian composer Giuseppe Verdi, tunes all notes approximately 31.8 cents lower. Proponents argue 432 Hz feels warmer and aligns with natural acoustic proportions, though both are mathematically consistent 12-TET tuning temperaments.
What was historical concert pitch before 440 Hz?
Before international standardization, pitch varied wildly by region and cathedral. Baroque instruments in the 17th and 18th centuries were typically tuned around A415 (roughly a semitone lower than modern pitch). Classical-era instruments during Mozart's time centered around A430. Modern symphony orchestras in Germany and Austria often tune up to A442 or A443 for brighter string projection.
How do I tune my guitar using reference tones?
Play the reference string note (e.g. 82.41 Hz for Low E) as a continuous drone. Pluck your guitar string and listen for acoustic 'beating' (a rhythmic throbbing in volume). As you turn your tuning peg closer to the exact pitch, the beats slow down. When the beating disappears completely, the string is in perfect unison.
What are Solfeggio frequencies?
Solfeggio frequencies are a sequence of sacred sound therapy tones based on historical Gregorian chants (such as 'Ut queant laxis'). While modern empirical acoustic science treats them as relaxation frequencies rather than medical cures, tones like 528 Hz and 432 Hz are widely utilized for meditation, breathwork, and deep focus.
Can I tune my violin online with reference tones?
Yes. Play the string reference for G, D, A or E in A440 or your chosen standard, bow the matching open string, and listen for beating between the two pitches. Slow the beats to a standstill by adjusting the peg, then confirm with double stops. This is a listening reference, so noisy rooms suit the microphone tuner better.