CozyEQ

CozyEQ addresses a very specific annoyance: YouTube's habit of jumping from a whisper-quiet spoken-word video into a booming advertisement or a clip with clipped, painful audio. Instead of asking you to fiddle with a graphic equalizer on every tab, the extension analyzes the audio stream in real time and applies automatic corrective adjustments, aiming for a smooth, cozy listening level rather than maximum fidelity.

Its two headline behaviours are autonomous EQ — analyzing and adjusting frequencies on the fly so harshness is softened — and volume precision, which pulls down the sharpest peaks and levels out jumps between content and ads. The idea is that you can leave YouTube running in the background or fall asleep to a podcast without being jolted awake by a sudden burst of sound.

CozyEQ is a small, single-purpose tool rather than a full audio suite, and it does not offer per-band manual EQ curves or multi-tab mixing. On the Chrome Web Store its developer states that it does not collect or use your data. The listing is published by The Simple Product Co. and version 0.1.2 was last updated in October 2023, so it is a mature but very lightweight utility — ideal if all you want is protection against sudden loud noise on YouTube.