Byna: Binaural Beats & Sleep

Two tones. One calm mind. Byna is a free binaural beats app for sleep, focus, meditation and relaxation. No ads, no accounts, no sign-up and no data collection. It works offline, and nothing is locked behind a payment. Put on headphones, pick a preset and press play. HOW BINAURAL BEATS WORK Byna plays a slightly different tone in each ear, and your brain hears a third sound: a slow pulse at the difference between them. For example, 250 Hz in one ear and 252 Hz in the other makes a 2 Hz beat. The effect was first described in 1839 and has been studied since the 1970s. Research suggests the brain may tend to fall into step with that rhythm, which is what each preset is tuned around. Everyone responds differently. 7 PRESETS ACROSS 4 BRAINWAVE BANDS: DELTA, THETA, ALPHA AND BETA - Wind Down (delta, 2 Hz) - winding down toward sleep - Quick Recharge (delta, 3 Hz) - a short restorative rest - Inner Calm (theta, 4 Hz) - the quiet edge between sleep and meditation - Open Mind (theta, 5 Hz) - let ideas surface - Still Mind (theta, 6 Hz) - deep meditation, best with eyes closed - Quiet Focus (alpha, 10 Hz) - relaxed focus for reading or journaling - Deep Work (beta, 18 Hz) - steady concentration for studying, writing or coding Sessions run 10 to 60 minutes (Quick Recharge up to 45), long enough for a nap, a study block or the time it takes to fall asleep. CHOOSE WHICH EAR HEARS THE HIGHER TONE By default the higher tone plays in your right ear. Switch it to the left in Settings, even mid-session, and the two tones glide across in about a second. No stopping, no restarting. REAL-TIME SOUND, NOT RECORDINGS Byna synthesizes pure sine tones on your device as you listen. No recorded loops, no compressed audio files, no sound packs to download. The carrier tones sit between 200 and 350 Hz. PINK OR BROWN NOISE Layer soft pink or brown noise under the tones to mask sounds around you. It helps in a noisy room, or when pure tones feel too bare on their own. VISUALS THAT MOVE WITH THE BEAT Four animation modes - Pulse, Morph, Glow and Ripple - follow your session's beat and expand to fullscreen. Or switch them off, close your eyes and just listen. GENTLE FROM START TO STOP - Every session fades in, and the beat eases up to its full rate over the first ten seconds - Stop fades the sound out over five seconds instead of cutting off - The two sleep presets skip the closing wind-down and simply fade away - Keeps playing with the screen off - Keep Screen On option and your own default volume YOUR JOURNEY STAYS ON YOUR PHONE Track sessions, minutes and daily streaks, see which bands you use most, climb through 8 ranks and collect 18 badges. Everything is saved on your device - no account, no cloud. WHY FREE? At its core, a binaural beat is two sine waves. Byna exists to show that a good binaural beats app does not need a paywall. No premium tier, no trial, no subscription. HEADPHONES REQUIRED Binaural beats only work when each ear hears its own tone, so use headphones or earbuds. Keep the volume comfortable, and stop listening if you feel discomfort, dizziness or a headache. Byna is made for relaxation and focus. It is not a medical device and does not treat, diagnose or cure any condition.