Decibelly

Decibly turns your iPhone into a real-time sound level meter — point it at any room and see the exact dB SPL reading update live, no setup required.

Set your own safe-noise threshold and Decibly vibrates the instant a room crosses it, so you always know when it's gotten too loud without staring at the screen.

Included from the first launch:

• Live dB SPL readout, updating in real time from the microphone
• Custom vibration threshold alert
• Save a reading with a location tag

Decibly Pro (one-time purchase, included forever):

• Full session history — every saved reading with time, place, average and peak dB
• Export your history as CSV for records or reports
• Custom alert notifications when a room crosses your threshold

Everything runs on-device. No account, no ads, no data ever leaves your phone.