Howl: A formant synthesizer app icon

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

Howl: A formant synthesizer screenshots

Ranked alternatives

Showing 1–20 of 1,000 ranked alternatives.

  1. Voice Synth Modular app icon

    Voice Synth Modular

    Qneo

    Sing with vocoder effects

    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.

    ★ 4.23,047 ratingsMusicFreeData updated 2026-09-08
  2. Attack Drums app icon

    Attack Drums

    Waldorf Music GmbH

    Create drum sounds and sequences

    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.

    ★ 4.423 ratingsMusic$14.99Data updated 2026-09-09
  1. Reverse Singing app icon

    Reverse Singing

    Calico Studio Inc.

    Record audio, it, and transform

    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.

    ★ 4.77,671 ratingsMusicFreeData updated 2026-09-17
  2. Klankwelle app icon

    Klankwelle

    Greg Okopal

    Create and control synthesizers

    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.

    ★ 4.737 ratingsMusicFreeData updated 2026-09-13
  3. Deep Synth : FM Synthesizer app icon

    Deep Synth : FM Synthesizer

    Aleksandar Mlazev

    Edit waves and modulate sounds

    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.

    ★ 4.02 ratingsMusic$4.99Data updated 2026-09-12
  4. iVoxel app icon

    iVoxel

    Harry Gohs

    A vocoder and singing machine.

    The app combines a voice-optimized synthesizer and a vocoder. It allows users to sing along to selected songs and record their voice for playback.

    ★ 3.317 ratingsMusic$6.99Data updated 2026-09-15
  5. Popsicle FX app icon

    Popsicle FX

    Kai Aras

    Process audio with 24 effects

    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.

    ★ 4.735 ratingsMusic$12.99Data updated 2026-09-06
  6. NuRack Auv3 FX Processor app icon

    NuRack Auv3 FX Processor

    Limelight Software

    Design effects with 80+ building blocks

    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.

    ★ 4.742 ratingsMusic$12.99Data updated 2026-09-06
  7. Voice Tuner — AI Vocal Changer app icon

    Voice Tuner — AI Vocal Changer

    Music Breath, OOO

    Tune with effects and beats

    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.

    ★ 4.5672 ratingsMusicFreeData updated 2026-09-11
  8. voice bot app icon

    voice bot

    erik sigth

    Record and play vocal loops in real

    Use a microphone to create live or recorded loops with trigger modes via keyboard. Process sound with bit and sample crusher, delay, and flanger. Play using a 25-key dynamic keyboard or core MIDI.

    ★ 4.718 ratingsMusic$4.99Data updated 2026-09-08

How we rank alternatives

Apps are ranked by functional similarity, category fit, rating confidence, and popularity.