For a song: how much silence sits before the first note and after the last. For an episode: every stretch of dead air, with its time, so you can find it in the edit. Checked in your browser — nothing is uploaded.
Podcast: 4+ seconds under -50 dBFS anywhere, plus the start and end.
Measured entirely in your browser — your audio is never uploaded anywhere.
Your audio is decoded and measured entirely in your browser. It is never uploaded or stored by CAPTD and never leaves your device.
Do this automatically from your episode audio
Episode trimmed? Spotlight's Episode mode turns it into posts for every platform, finds clip moments and makes audiograms.
Episode mode is part of the Spotlight workspace on CAPTD's paid plans — see pricing.
Open Episode modeMeasures the level of every 10 ms of the file (the louder channel's RMS). For music it reports the silence under -60 dBFS before the sound starts and after it ends. For podcasts it also lists every stretch of 4 seconds or more under -50 dBFS — dead air — with start and end times.
Shaded areas on the waveform are the silences found. A podcast's pauses between sentences are shorter than the gap threshold and aren't listed.
Dead air is unintended silence in a broadcast or a recording — long enough that a listener wonders whether it has stopped.
In music, the issue is usually at the ends: silence left before the first note or after the fade, which playlists and gapless albums make obvious.
Long silences make listeners skip. Finding them by ear means listening to the whole file; the checker lists them in seconds.