Solfeggio Frequencies

How the nine Solfeggio frequencies are combined into sequences for sleep, focus and meditation, with the musical intervals between the tones and a guide to using them through the day.

Which app is best for Solfeggio frequencies? Honest, detailed comparison of Insight Timer, Calm, Brain.fm, Endel, and Spotify — for 2026, by use case and budget.

Should you listen to Solfeggio frequencies on speakers or headphones? Acoustic differences, use-case mapping, and a budget-by-budget 2026 gear recommendation list.

Which Solfeggio frequencies actually support concentration? An honest guide to 741 Hz, 852 Hz, and 528 Hz + beta-wave binaural beats for sharper, more sustainable focus at work and study.

How can sound accompany us through grief? A gentle guide to listening to Solfeggio frequencies during mourning, with what music therapy research can and cannot say.

Is it safe to play Solfeggio frequencies around pets? What research says about music and animals, with practical cautions on volume for dogs, cats and small animals.

s it safe to play Solfeggio frequencies for children? From newborns to teenagers — an age-by-age guide with safe volume guidelines, recommended frequencies, and family practice ideas.

396 Hz and 417 Hz compared with what can actually be checked: an 89-cent gap (just under a semitone), a 21 Hz beat when played together, nearest piano notes, the origin of the numbers, and the state of research. Play both in the Frequency Lab.

Do scientific papers on 528Hz actually exist? This honest review of the research covers DNA claims, autonomic nervous system studies, stress research, and what remains unproven.

528 Hz is the pitch of one tone; 432 Hz is a tuning for a whole piece, so they are different kinds of thing. The arithmetic, the one study that compared them directly, our own measurements, and how to choose, without promising effects.