Ghostfi · Halloween music visualizer for Mac

Knows the music

Even the graveyard keeps the beat.

One shared analyzer finds the BPM, the bar, beat 1 and the drop. Every screen shows the same tempo, and the count carries on across scene changes.

Change scene every 16 or 32 bars, right on the first beat of the phrase
Or the moment the kick slams back in after a breakdown
Drum & bass reads 174, not half time

The Graveyard scene: a pumpkin moon over tombstones, one showing the live BPM

Sign text

Your name, in the haunted house.

Type your name or the event and it shows up on most scenes. Retype it mid-set from the control strip and it goes live as you type.

Each screen can show its own scene and filter, or all the same
A blackout key fades every screen to black, and back
A 30 fps mode for about half the GPU, with beats still tracked 60 times a second

The Vampire scene: a coffin under a blood-red moon, with HAPPY HALLOWEEN on its plate

Built for gigs

Hears just your DJ software.

Ghostfi hears your Mac's own sound with no setup. Or point it at one output device, like rekordbox's, and it follows only what that device plays.

Or an input: a mixer, external decks or a microphone
Fullscreen on any monitor without ever taking focus from your DJ app
Installs beside Glowfi, with its own settings
The audio is analysed in memory, never recorded, saved or sent anywhere

The Cauldron scene: a bubbling brew over green flames, potion shelves behind

17 Halloween scenes

Pumpkins, graveyards, haunted houses, a Ouija board and a skeleton disco, all drawn in Metal. Each screen starts on a different one, and any you don't like can be switched off.

**Jack-o-Lantern**A grinning neon pumpkin

**Ghost Rain**Pumpkins, candy and ghosts falling in columns

**Cauldron**A bubbling brew on green flames

**Haunted House**A house on the hill under a full moon

**Vampire**A coffin under a blood-red moon

**Witch Road**A moonlit road lined with pumpkins

**Skull VFD**A vacuum-fluorescent skull panel

**Crystal Ball**A fortune teller's table and tarot cards

**Graveyard**Tombstones under a pumpkin moon

**Phantom Organ**A pipe organ with a phantom at the keys

**Ouija**A planchette gliding over the board

**Mummy's Tomb**A sarcophagus between flickering torches

**Skeleton Dance**Skeletons on a disco floor

**Creature Feature**A pixel skull on a horror-movie screen

Everything Glowfi does

Ghostfi runs on Glowfi's engine: the same 10 filters and 12 transitions, the same control strip that never takes focus from your DJ app, and the same keys.

Platform: Mac with Apple silicon
Requires: macOS 14.2 or later
Listens to: The Mac's sound, one output, or any input
Screens: Any monitor, plus a preview window
Graphics: Metal, 60 or 30 fps
Privacy: Audio never recorded or sent