DAF Pro: Stammer & Parkinson's
Delayed auditory feedback
Rs 500.00 · Designed for iPad. Not verified for macOS.
Hear your own voice on a short delay — a clinically recognised way to slow and steady speech. Built by a speech and language therapist. No ads, no subscription.
DAF Pro helps people who stammer 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 recognised 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 stammer, and it is also used to help people with Parkinson's control their speaking rate.
Who It's For
* People who stammer or stutter
* People with Parkinson's disease
* People with dysarthria
* People who clutter
* Speech and language therapists, 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
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Updated for iOS 27
The developer, Speechtools Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Speechtools Ltd
- Size
- 12.2 MB
- Category
- Medical
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 25 more
- English, Arabic, Danish, Dutch, Filipino, French, German, Greek, Hebrew, Hindi, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Vietnamese
- Age Rating
4+
- 4+
- Copyright
- © Speechtools Ltd 2026
