---
title: "Howl: A formant synthesizer - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "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 w"
---

# Howl: A formant synthesizer — United States

![Howl App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/4f/e2/05/4fe205b7-622b-4510-9275-8270a20f24be/App_Icon-0-0-1x_U007emarketing-0-6-0-85-220.png/400x400bb.png)

**Developer:** [Daniel Clelland](https://apptail.io/developer/daniel-clelland-WLzd)
**Category:** Music
**Rating:** 4.3/5 (39 ratings)
**Price:** Free
**Bundle ID:** com.protonome.HOWL
**Store:** Apple App Store
**Country:** United States
**Version:** 2.4.1 (released 2024-08-16)
**Original Release:** 2015-12-20

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1067562312)
**AppTail Page:** [https://apptail.io/app/howl-a-formant-synthesizer-oabf/united-states](https://apptail.io/app/howl-a-formant-synthesizer-oabf/united-states)

## Howl Description
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 

## Howl Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/be/f6/36/bef636c4-7157-df83-01a4-1c73470ba9bf/pr_source.png/960x640.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/58/08/c3/5808c327-bbfa-375e-b844-9919f510f27c/pr_source.png/960x640.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/05/2d/64/052d645f-b20c-0de0-6c7d-3f31000d5439/pr_source.png/960x640.png)

## Howl Rating Breakdown in United States
- 5 stars: 30 (77%)
- 4 stars: 0 (0%)
- 3 stars: 2 (5%)
- 2 stars: 3 (8%)
- 1 stars: 4 (10%)

## Howl Reviews in United States

### **--- "Remove audiobus with no additions come on!"
Auv3 please !!!!🙏
-- DJSUN1, 2024-08-16

### *---- "Used to be amazing."
iOS needs improvement. App no longer makes any sound.
-- Bleezus Blake, 2024-05-16

### *---- "Broken latest version of iOS?"
Doesn't seem to do anything anymore other than try to listen to the mic and cause feedback
-- Ray Holden, 2024-01-07

### **--- "Just feedback"
I just got this and there’s just feedback sound. Don’t know how to use it
-- Snapfi, 2023-02-09

### **--- "Doesn’t produce its own sound. Only uses mic."
Self explanatory. I don’t know what happened but this used to work just fine. Not anymore
-- Mars Isikka, 2023-01-16

### ***** "Thank you for making this app"
Lots of well thought out features, this app is a thing of beauty. The world is a better please because it exists. 

It took me a bit to get used to controlling the knobs by angle. My instinct was the click the knob and hold, dragging up and down to change the value. That interface makes it easier to do fine adjustments but as is it is totally workable.
-- Blinkenlighten, 2021-04-12

### ***** "Amazing and completely free"
This is a simple and intuitive Formant synth app that is 100% free. Virtual midi would make this a six star app. Thank you to the developer for this gift. Keep up the good work!
-- doppelganger86, 2019-09-04

### ***** "Fun, easy & cool"
that’s not just what my business card says; it applies to howl too. this app totally fills my formant needs (which were considerable in Q2 and expected to increase for the rest of the fiscal year) and adds enough fx options to make it more than a novelty. the interface is excellent
-- RobotServentsNow, 2019-08-05

### *---- "Want to Like it - No Audiobus or AUM"
Does not load in either Audiobus or AUM. Also, the vowel pad has no graphic effect as pictured.
-- Gern Blasnton, 2018-06-24

### ***-- "I like it but..."
Can’t figure out why when the app is open it disables sound output to my Bluetooth headphones. Makes it useless when I’m traveling or on the train.
-- Mozfits, 2018-03-27

[View all Howl reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)



## Howl Discovered Keywords
- howl


## Howl Available In
- [United States](https://apptail.io/app/howl-a-formant-synthesizer-oabf/united-states)
- [United Kingdom](https://apptail.io/app/howl-a-formant-synthesizer-oabf/united-kingdom)
- [Australia](https://apptail.io/app/howl-a-formant-synthesizer-oabf/australia)
- [Canada](https://apptail.io/app/howl-a-formant-synthesizer-oabf/canada)
- [Japan](https://apptail.io/app/howl-a-formant-synthesizer-oabf/japan)
- [Russia](https://apptail.io/app/howl-a-formant-synthesizer-oabf/russia)
- [Ukraine](https://apptail.io/app/howl-a-formant-synthesizer-oabf/ukraine)
- [Argentina](https://apptail.io/app/howl-a-formant-synthesizer-oabf/argentina)
- [Brazil](https://apptail.io/app/howl-a-formant-synthesizer-oabf/brazil)
- [Algeria](https://apptail.io/app/howl-a-formant-synthesizer-oabf/algeria)
- [Ecuador](https://apptail.io/app/howl-a-formant-synthesizer-oabf/ecuador)
- [Egypt](https://apptail.io/app/howl-a-formant-synthesizer-oabf/egypt)
- [Grenada](https://apptail.io/app/howl-a-formant-synthesizer-oabf/grenada)
- [Hong Kong SAR China](https://apptail.io/app/howl-a-formant-synthesizer-oabf/hong-kong)
- [Honduras](https://apptail.io/app/howl-a-formant-synthesizer-oabf/honduras)
- [Indonesia](https://apptail.io/app/howl-a-formant-synthesizer-oabf/indonesia)
- [Israel](https://apptail.io/app/howl-a-formant-synthesizer-oabf/israel)
- [India](https://apptail.io/app/howl-a-formant-synthesizer-oabf/india)
- [Iceland](https://apptail.io/app/howl-a-formant-synthesizer-oabf/iceland)
- [South Korea](https://apptail.io/app/howl-a-formant-synthesizer-oabf/south-korea)
- [Kuwait](https://apptail.io/app/howl-a-formant-synthesizer-oabf/kuwait)
- [Cayman Islands](https://apptail.io/app/howl-a-formant-synthesizer-oabf/cayman-islands)
- [Kazakhstan](https://apptail.io/app/howl-a-formant-synthesizer-oabf/kazakhstan)
- [Lebanon](https://apptail.io/app/howl-a-formant-synthesizer-oabf/lebanon)
- [Sri Lanka](https://apptail.io/app/howl-a-formant-synthesizer-oabf/sri-lanka)
- [Mexico](https://apptail.io/app/howl-a-formant-synthesizer-oabf/mexico)
- [Malaysia](https://apptail.io/app/howl-a-formant-synthesizer-oabf/malaysia)
- [Nigeria](https://apptail.io/app/howl-a-formant-synthesizer-oabf/nigeria)
- [Norway](https://apptail.io/app/howl-a-formant-synthesizer-oabf/norway)
- [New Zealand](https://apptail.io/app/howl-a-formant-synthesizer-oabf/new-zealand)
- [Oman](https://apptail.io/app/howl-a-formant-synthesizer-oabf/oman)
- [Peru](https://apptail.io/app/howl-a-formant-synthesizer-oabf/peru)
- [Philippines](https://apptail.io/app/howl-a-formant-synthesizer-oabf/philippines)
- [Pakistan](https://apptail.io/app/howl-a-formant-synthesizer-oabf/pakistan)
- [Saudi Arabia](https://apptail.io/app/howl-a-formant-synthesizer-oabf/saudi-arabia)
- [Singapore](https://apptail.io/app/howl-a-formant-synthesizer-oabf/singapore)
- [Thailand](https://apptail.io/app/howl-a-formant-synthesizer-oabf/thailand)
- [Tunisia](https://apptail.io/app/howl-a-formant-synthesizer-oabf/tunisia)
- [Taiwan](https://apptail.io/app/howl-a-formant-synthesizer-oabf/taiwan)
- [Uzbekistan](https://apptail.io/app/howl-a-formant-synthesizer-oabf/uzbekistan)
- [Vietnam](https://apptail.io/app/howl-a-formant-synthesizer-oabf/vietnam)
- [United Arab Emirates](https://apptail.io/app/howl-a-formant-synthesizer-oabf/united-arab-emirates)
- [South Africa](https://apptail.io/app/howl-a-formant-synthesizer-oabf/south-africa)
- [Azerbaijan](https://apptail.io/app/howl-a-formant-synthesizer-oabf/azerbaijan)
- [Bahrain](https://apptail.io/app/howl-a-formant-synthesizer-oabf/bahrain)
- [Belarus](https://apptail.io/app/howl-a-formant-synthesizer-oabf/belarus)
- [Switzerland](https://apptail.io/app/howl-a-formant-synthesizer-oabf/switzerland)
- [Chile](https://apptail.io/app/howl-a-formant-synthesizer-oabf/chile)
- [China](https://apptail.io/app/howl-a-formant-synthesizer-oabf/china)
- [Colombia](https://apptail.io/app/howl-a-formant-synthesizer-oabf/colombia)
- [Dominican Republic](https://apptail.io/app/howl-a-formant-synthesizer-oabf/dominican-republic)

---

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