Howl: A formant synthesizer

Name: Howl: A formant synthesizer
Rating: 4.3 (39 reviews)
Author: Daniel Clelland

By: Daniel Clelland App

Music

Overview

Version:

2.4.1

Last updated: 2024-08-16

Ranking

#225,034 ▼ 967

Overall

Features & Capabilities

HOWL is a simple vocoder/synthesizer. It uses formants to simulate the human voice and a pitch-space keyboard to help you find interesting melodies.

Features:

• Simple synthesizer (just a sawtooth wave nothing too complicated okay) • Simple vocoder (four parallel bandpass filters, a bit like the Klatt engine) • Audiobus support, so you can pipe your own audio through the vocoder and/or send the output to other software • Adjustable pitch-space keyboard • Cool FX (bitcrush, reverb, vibrato and tremolo)

Download it today!

HOWL is also open source (check out the code at https://github.com/dclelland/HOWL).

User Growth & Download Statistics

App

By:

Daniel Clelland

Rating:

4.30

(39)

Version:

2.4.1 Last updated: 2024-08-16

Version code:

868246476

Creation date:

2015-12-20

Compatible devices:

Size:

6.78MB

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-07-22

Compare stats and ranking:

Ranking

# 225,034 ▼ 967

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Daniel Clelland

Apple Apps Store

https://apps.apple.com/us/app/howl-a-formant-synthesizer/id1067562312

User Reviews

Review consensus: Howl is a fun, intuitive, feature-rich free formant synth that shines for sonic exploration and mobile routing. Multiple users praise the UI, sound design, and musical potential. The recurring negatives are audio reliability (no sound or feedback issues), missing AUv3/IAA/Audiobus support, and some knob sensitivity or UX quirks. A few note Bluetooth/speaker quirks and minor visual feedback gaps, but overall it is a standout tool for vocal synthesis and experimental sound design.

Pros

Fun to use and appealing for linguistics/phonetics; you can almost make it talk.
Intuitive, responsive touchscreen UI that's easy to learn.
100% free with a strong feature set.
Excellent integration with other apps (AUM/Audioshare) for routing and experiments.
Rich modulation options for vocal formants and vowel shaping.

Cons

Audio output instability (no sound or disruptive feedback) on some runs.
Lack of AUv3/IAA/Audiobus support, with users repeatedly requesting these features.
Some controls are overly sensitive, making precise adjustments difficult.
Compatibility issues with Audiobus/AUM and occasional missing vowel pad visual feedback.

Recent reviews

This is a lot of fun to play with. It’s probably useful if you are into linguistics or phonetics. You can almost make it talk. It would be cool if consonants were added to make this fully possible.