Woofer

Turn the bass up.
On anything you play.

A shelf under 80 Hz lifts the weight of a mix, a six-band equalizer takes it further, and both apply to music you stream and to files you bring yourself. No account, no sign-in.

Get it on the App Store iPhone · iOS 18+ · no account needed

What it does

Bass boost

One slider, up to +12 dB below 80 Hz. A shelf rather than a peak, which is what "more bass" actually means.

Six-band equalizer

60 Hz to 15 kHz, spaced the way hearing is. Drag a band and you hear it move — there is no apply step.

Seven presets

Flat, Bass Boost, Deep Bass, Vocal, Rock, Electronic and Treble. Trying one does not lose the curve you built.

Your own files

Import audio from Files and it plays through the same equalizer as everything else.

Preamp

Lifting six bands at once can clip. The preamp pulls the whole curve down so it does not.

Lock screen controls

Play, pause and skip from the lock screen and from Control Center, like any other player.

Getting a bigger low end

  1. Start something playing — a track from the catalogue, or a file you imported from Files.
  2. Open Equalizer and pull the Bass Boost slider up. The readout tells you what it is worth in decibels.
  3. If it starts to sound loose rather than deep, back the slider off and drop the preamp a couple of dB instead. Distortion is almost always headroom, not bass.
Small speakers cannot do sub-bass. The iPhone's own speaker has nothing to move air with below roughly 200 Hz, so a shelf at 80 Hz does very little there. On headphones the same setting is obvious. That is physics, not a setting we can add.

Common questions

Does it boost Spotify or Apple Music?

No, and no app on iOS can. Apple does not let one app process another app's audio. The equalizer applies to what plays in Woofer — the catalogue and the files you import.

What audio files can I import?

Anything iOS can decode — MP3, M4A/AAC, WAV, AIFF, FLAC and CAF. Files are copied into the app so they keep working after you move or delete the original.

Is it free?

Browsing, playing and importing your own files are free. A subscription covers the bass slider, the equalizer and its presets, catalogue search, and playback continuing when the app is in the background. The price and any trial length are shown in the app before you buy.

Does it drain the battery?

The equalizer runs in a single audio unit already in the playback path, so the cost of having it on is close to nothing.

Get it on the App Store