Leave this running near your dog. It listens for sharp, loud bursts in the bark range and plays an interrupt sound, then waits a cooldown before responding again.
High-frequency tones tuned for the iPhone speaker. Dogs hear up to ~45 kHz; most adults stop hearing around 15–17 kHz, but children and teens may still hear up to ~20 kHz.
Higher is harder for people to hear, but the iPhone speaker gets weaker above ~18 kHz. Use Test: if you can hear it, move the slider up until you can't.
Very high volume can make the speaker distort and click audibly. Around 60–80% is the sweet spot.
On iPhone: turn the ring/silent switch to ring, turn media volume up, keep Safari open in front with the phone plugged in, and turn Auto-Lock off (Settings › Display & Brightness). Pair the tone with rewarding quiet, and stop using it if your dog seems frightened.
How far above background noise a sound must jump. Raise it if barks are missed; lower it if TV or voices set it off.
Minimum wait between sounds, so a barking fit gets one interrupt, not a barrage.
No barks yet. Detected barks show here with time and loudness.