Apps Like Howl: A formant synthesizer for iPhone and iPad
Create and share vocal sounds
Create vocal effects using a vocoder with four parallel bandpass filters. Generate synthesized sounds with a simple sawtooth wave. Adjust pitch via a customizable keyboard. Apply effects like bitcrush, reverb, and vibrato.
by Daniel Clelland★ 4.339 ratingsMusicFreeData updated 2026-09-10
Create drum sounds and synthesize vocals using a 24-part sound engine. Use a pattern sequencer to arrange beats. Apply effects including a Phrase Vocoder that converts text to vocal-like sounds. Adjust vocal characteristics such as gender.
Allows users to process their into various effects. Apply vocoder, auto pitch, and harmonizing pitch shift. Adjust speed and sample sounds. Create robotic, animal, or comedic voices. Play musical instruments by without physical input.
Create and control up to 8 synthesizers simultaneously using a built-in keyboard or step sequencer. Connect external MIDI devices for input. Adjust sounds with a dynamic compressor and 10-band graphic equalizer.
Record and audio to create humorous effects. Apply voice changer effects such as alien, chipmunk, ghost, demon, giant voice, vocoder, and autotune. Share reversed audio clips directly.
Create and customize synths with wave shape modulation and AUV3 support. Adjust envelopes, apply reverb and tremolo effects. Use a polyphonic keyboard with 5 octaves range. Connect MIDI keyboards via USB for velocity and pitch shift.
Apply multi-effects to audio with two stereo effect engines using 24 algorithms. Configure effects in series, parallel, or stereo split modes. Control parameters via an XY pad with recordable motion. Adjust settings for precise sound shaping.
Design custom audio effects using 80+ building blocks. Create complex routing in series or parallel. Build custom interfaces with Interface Builder. Control audio components for tailored processing.
Record and edit with pitch shifting and key adjustment. Add backing tracks and beats. Record video with real-time audio integration. Apply effects to mimic celebrity voices. Export final audio and video files.
The app transforms an iPhone or iPad into a synthesizer using additive, subtractive, and FM sound synthesis. It supports external MIDI input for notes, modulation wheel, and pitch bend, and includes screen recording for sharing sounds.