dB Scout

Turn your phone into a sound level meter. dB Scout measures ambient noise in real time with A/C/Z frequency weighting and Fast/Slow time weighting — the same controls as professional SPL meters.

FEATURES

Real-time SPL meter with on-screen gauge
A / C / Z frequency weighting (selectable from a dropdown)
Fast / Medium / Slow / Slowest time weighting (IEC 61672 Fast = 125 ms, Slow = 1000 ms)
Bottom-of-screen dB strip showing 0 / 30 / 60 / 90 / 120 references
Dark and light themes
Works fully offline — no account, no data sent off-device

PRO (one-time unlock)

Guided Calibration Wizard — pick a reference scene (quiet room, conversation, traffic, vacuum, lawn mower, or custom), hold the phone, dB Scout auto-derives the offset for your device's microphone. More accurate than guessing.
Remove ads.

WHO IT IS FOR

Renters checking apartment noise before signing a lease, parents checking nursery noise, contractors and DIYers spot-checking power tools, students learning acoustics, anyone curious how loud their environment really is.

PRIVACY

Microphone audio is processed in real time only. No audio is ever recorded, stored, or transmitted. No account required. Works completely offline. Full privacy policy: https://griswoldlabs.com/privacy/sound-meter/

FEEDBACK

GriswoldLabs builds small, useful apps. If something is broken or you have an idea, email charles@griswoldlabs.com.