---
title: "DAF Pro: Stutter & Parkinson's - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "DAF Pro helps people who stutter and people with Parkinson's slow down and speak more fluently. Put on headphones, speak, and hear your own voice a fraction of a second later.  How It Works Delayed au"
---

# DAF Pro: Stutter & Parkinson's — United States
> Delayed auditory feedback

![DAF Pro App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/a8/37/d3/a837d3b4-fff8-5fff-3ee9-ee334e3a070d/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Speechtools](https://apptail.io/developer/speechtools-Wvv) (United Kingdom)
**Category:** Medical
**Rating:** 4.5/5 (97 ratings)
**Price:** $5.99
**Bundle ID:** com.aszart.dafprofessional
**Store:** Apple App Store
**Country:** United States
**Version:** 4.10.0 (released 2026-09-17)
**Original Release:** 2012-01-04
**Languages:** English, Arabic, Danish, Dutch, Finnish, French, German, Greek (modern), Hebrew (modern), Hindi, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Russian, Chinese, Spanish, Swedish, Thai, Turkish, Vietnamese

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id491299921)
**AppTail Page:** [https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/united-states](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/united-states)

## DAF Pro Description
DAF Pro helps people who stutter and people with Parkinson's slow down and speak more fluently. Put on headphones, speak, and hear your own voice a fraction of a second later.

How It Works
Delayed auditory feedback (DAF) is a clinically recognized speech therapy technique. Hearing your voice on a short delay naturally slows your speaking rate, which can make speech smoother and clearer. Research suggests DAF helps around 1 in 3 people who stutter, and it is also used to help people with Parkinson's control their speaking rate.

Who It's For
* People who stutter or stammer
* People with Parkinson's disease
* People with dysarthria
* People who clutter
* Speech-language pathologists, for therapy sessions and home practice

Features
* Adjustable delay and pitch shift
* Very low latency, so short delays stay short
* Keeps working in the background and with the screen off
* Record and play back your speech
* Works with wired and Bluetooth headsets. Bluetooth adds extra delay that varies by headset, so wired headphones work best for short delays.

Getting Started
Put on headphones, set the delay to around 50–100 ms, press Start and speak. Then adjust until your speech feels slower and steadier.

Built by a UK speech and language therapist. One-time purchase: no subscription, no ads, no account needed.

Questions or feedback? Contact us at support@speechtools.co

## DAF Pro Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/13/3f/69/133f6908-96a3-1475-6369-7de2a91a0279/iphone_00_hero.png/1320x2868.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/bb/d6/5c/bbd65cd5-83ce-dbfb-9587-ba4689d7d24d/iphone_01_kudos.png/1320x2868.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/a5/74/6a/a5746a2e-1b4d-72c7-f504-a0629b9cffbc/iphone_02_conditions.png/1320x2868.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/99/32/04/9932047e-fc6a-88ed-3447-716b21e30118/iphone_03_how.png/1320x2868.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/68/46/87/68468721-5aaa-6c4b-8066-6359f2ebaeb4/iphone_04_record.png/1320x2868.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/97/71/be/9771be35-e603-c214-72b8-401683245adf/iphone_05_ways.png/1320x2868.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/53/1b/c8/531bc808-c24e-4b84-0310-bf1121cbdbb7/iphone_06_trust.png/1320x2868.png)

## DAF Pro Rating Breakdown in United States
- 5 stars: 74 (76%)
- 4 stars: 10 (10%)
- 3 stars: 3 (3%)
- 2 stars: 4 (4%)
- 1 stars: 6 (6%)

## DAF Pro Reviews in United States

### *---- "Doesn’t work!!"
Since there’s no way to message the creators of this app, I’ll do it here. I just downloaded this app. It says it’s ‘supposed’ to be super simple to use. Well, if you are looking for an app that only produces a LOUD LOUD buzzing sound in your ears, this is the app for you. It’s so loud that I could practically feel my teeth vibrating and turning down the volume made no change in the ridiculously loud vibrating sound this app created. If you want to actually hear your own voice in hopes of stopping or lessening your stutter, look elsewhere because this app can’t hear your voice over its own incessant, brain numbing buzzing. 

I am using an iPhone 14Pro and 1st Gen AirPods. I know they are both working correctly because I just finished a Duolingo session and had no problem completing today’s lesson. Sound and mic worked just fine. 

What a waste of $4.99!
-- Bordprson, 2023-06-04

### ***** "This works."
I been stuttering for over 50 years and I used everything from speecheasy devices to taking classes.  This works just like the speecheasy without spending $4000. But pros and cons of both.  Thanks so much for helping me with this.  

Anywar to get this to work with a hearing air
-- Stuttering John, 2022-10-10

### *---- "This App isn’t it"
Like you can’t even hear yourself and Idk why It’s so low. Like you guys are charging people and not updating the app?
-- MM7896, 2022-01-28

### *---- "Whack wasted money"
Bought it for nothing. Wasted money for it to be super muffled and robotic can’t even hear yourself. Don’t bother
-- mixed owl, 2020-11-26

### ***** "Excellent app"
App operation is straightforward and clean. The clarity of the audio and delay is also top notch. Highly recommend use of the app as an additional tool for the management of stuttering.
-- HoosierGrad, 2020-05-14

### **--- "It would work great  if"
I have to use another DAF app because I’m using AirPods and there is too much delay for me. Can you make no delay like other apps. 23 ms delay and Bluetooth delay is way to much for me.
-- Plants72, 2020-01-27

### ***-- "Cannot use pitch change"
Any change in pitch causes a static sound.
-- ReentWT, 2020-01-08

### ***** "Thank you so much"
From the bottom of my heart, thank you. I work in a call center and I have a stutter. I put an earbud in and put it on 55ms. I don’t stutter at all on the phone now. Then I forgot to put my earbuds in and I didn’t stutter. Hoping it will improve my speech overall after the repetition. It also helps me slow down my speaking and makes me feel calm. This app is priceless. Best 3 bucks I ever spent in my life. I feel hope that I will be able to speak fluently now. This has changed my life. Thank you and god bless
-- Steven578, 2019-09-18

### ***** "Thank youuuuu so much"
Wow you cured me god bless ❤️🙏🏽💯
-- ACEGX, 2019-06-20

### ***-- "scratchiness with any pitch change"
works great with no change in pitch, but a scratchy noise is apparent with any change in pitch. tried other headphones, no difference.
-- Mat1999, 2018-08-15

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


## DAF Pro Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Denmark | Medical | #7 |
| Top Paid | Kazakhstan | Medical | #10 |
| Top Paid | Ukraine | Medical | #16 |
| Top Paid | France | Medical | #16 |
| Top Paid | United Kingdom | Medical | #22 |
| Top Paid | Nigeria | Medical | #23 |
| Top Paid | Russia | Medical | #29 |
| Top Paid | Türkiye | Medical | #32 |
| Top Paid | Azerbaijan | Medical | #32 |
| Top Paid | South Korea | Medical | #34 |
| Top Paid | Vietnam | Medical | #36 |
| Top Paid | Pakistan | Medical | #37 |
| Top Paid | Kuwait | Medical | #38 |
| Top Paid | Saudi Arabia | Medical | #42 |
| Top Paid | Belarus | Medical | #42 |
| Top Paid | China | Medical | #43 |
| Top Paid | Egypt | Medical | #43 |
| Top Grossing | Denmark | Medical | #46 |
| Top Paid | Sweden | Medical | #46 |
| Top Paid | Poland | Medical | #48 |
| Top Paid | Norway | Medical | #49 |
| Top Paid | India | Medical | #50 |
| Top Paid | United Arab Emirates | Medical | #52 |
| Top Paid | Canada | Medical | #55 |
| Top Paid | Portugal | Medical | #56 |
| Top Paid | Israel | Medical | #57 |
| Top Paid | Taiwan | Medical | #59 |
| Top Paid | Finland | Medical | #61 |
| Top Paid | Lebanon | Medical | #62 |
| Top Paid | United States | Medical | #62 |
| Top Grossing | Kazakhstan | Medical | #65 |
| Top Paid | Belgium | Medical | #67 |
| Top Paid | Peru | Medical | #69 |
| Top Paid | Japan | Medical | #72 |
| Top Paid | Dominican Republic | Medical | #73 |
| Top Paid | Romania | Medical | #74 |
| Top Paid | Italy | Medical | #81 |
| Top Paid | Argentina | Medical | #83 |
| Top Paid | Czechia | Medical | #84 |
| Top Paid | Singapore | Medical | #87 |
| Top Paid | Denmark | Overall | #88 |
| Top Paid | Hungary | Medical | #95 |
| Top Paid | Chile | Medical | #100 |
| Top Paid | Hong Kong SAR China | Medical | #102 |
| Top Paid | South Africa | Medical | #103 |
| Top Paid | Spain | Medical | #104 |
| Top Paid | Ireland | Medical | #106 |
| Top Paid | Brazil | Medical | #112 |
| Top Paid | Netherlands | Medical | #113 |
| Top Paid | Indonesia | Medical | #120 |
| Top Paid | Greece | Medical | #131 |
| Top Paid | Malaysia | Medical | #143 |
| Top Paid | Ecuador | Medical | #147 |
| Top Paid | Austria | Medical | #159 |
| Top Paid | Thailand | Medical | #161 |
| Top Paid | Australia | Medical | #163 |
| Top Paid | Switzerland | Medical | #170 |
| Top Paid | New Zealand | Medical | #170 |
| Top Paid | Colombia | Medical | #176 |
| Top Paid | Germany | Medical | #188 |
| Top Paid | Philippines | Medical | #194 |
| Top Paid | Mexico | Medical | #203 |

## DAF Pro Discovered Keywords
- speech aid
- daf pro
- stuttering
- stammering


## DAF Pro Available In
- [United States](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/united-states)
- [United Kingdom](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/united-kingdom)
- [Russia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/russia)
- [China](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/china)
- [Japan](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/japan)
- [Sweden](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/sweden)
- [India](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/india)
- [Canada](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/canada)
- [Germany](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/germany)
- [Türkiye](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/turkey)
- [Brazil](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/brazil)
- [Italy](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/italy)
- [France](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/france)
- [Saudi Arabia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/saudi-arabia)
- [Taiwan](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/taiwan)
- [Norway](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/norway)
- [Mexico](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/mexico)
- [Australia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/australia)
- [Chile](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/chile)
- [Netherlands](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/netherlands)
- [Spain](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/spain)
- [United Arab Emirates](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/united-arab-emirates)
- [Peru](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/peru)
- [Ecuador](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/ecuador)
- [South Africa](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/south-africa)
- [Argentina](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/argentina)
- [Austria](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/austria)
- [Belgium](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/belgium)
- [Switzerland](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/switzerland)
- [Colombia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/colombia)
- [Denmark](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/denmark)
- [Egypt](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/egypt)
- [Finland](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/finland)
- [Greece](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/greece)
- [Indonesia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/indonesia)
- [South Korea](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/south-korea)
- [Kazakhstan](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/kazakhstan)
- [New Zealand](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/new-zealand)
- [Philippines](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/philippines)
- [Poland](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/poland)
- [Romania](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/romania)
- [Singapore](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/singapore)
- [Ukraine](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/ukraine)
- [Lebanon](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/lebanon)
- [Luxembourg](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/luxembourg)
- [Latvia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/latvia)
- [Madagascar](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/madagascar)
- [Croatia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/croatia)
- [Malaysia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/malaysia)
- [Nigeria](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/nigeria)
- [Hong Kong SAR China](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/hong-kong)
- [Estonia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/estonia)
- [Nepal](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/nepal)
- [Bulgaria](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/bulgaria)
- [Lithuania](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/lithuania)
- [Algeria](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/algeria)
- [Armenia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/armenia)
- [Pakistan](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/pakistan)
- [Azerbaijan](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/azerbaijan)
- [Portugal](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/portugal)
- [Uzbekistan](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/uzbekistan)
- [Dominican Republic](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/dominican-republic)
- [Czechia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/czechia)
- [Cyprus](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/cyprus)
- [Vietnam](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/vietnam)
- [Slovenia](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/slovenia)
- [Israel](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/israel)
- [Iceland](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/iceland)
- [Ireland](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/ireland)
- [Hungary](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/hungary)
- [Thailand](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/thailand)
- [Kuwait](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/kuwait)
- [Belarus](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/belarus)
- [Panama](https://apptail.io/app/daf-pro-stutter-parkinsons-RFZc/panama)

---

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