Premium Tool
Beat Explorer
Move the slider right to sharpen. Watch the beats speed up. Slow them to zero for pure unison.
Press Play to hear the combined tone
Reference
Fixed pitch
Compare
Adjustable pitch
Preset Intervals
How to Hear This
When two slightly different pitches sound together, they interfere — creating a pulsing "beat." The beat rate (in BPS) equals the frequency difference between the two tones.
In equal temperament, intervals are deliberately slightly impure. A perfect fifth is narrowed by ~2 cents, producing slow, acceptable beats. A major third is widened by ~14 cents — faster, expressive beats.
Use the slider to explore these relationships by ear. This is how piano tuners measure precision — not with a meter, but with their ears.