DAF Delayed Auditory Feedback Downloads & RevenueDAF Delayed Auditory Feedback · App Store
Not in any tracked top chart right now.
Updated 8 Nov 2026 · rankings refresh through the day
DeveloperJunichiro Seyama
CategoryEntertainment
PriceFree
Released
Rating★ 2.2 (10)
Version1.2.2
Age rating12+
First seen by us
23 Oct 2026
23 Oct 2026DAF Delayed Auditory Feedback update history & changes
Last change · 3 events since 12 Mar 2013Full timeline ↓Full timeline · 3 events
- 🆕DAF Delayed Auditory Feedback first spotted by AppInsiderJapan (found via developer)
- 📦DAF Delayed Auditory Feedback version 1.2.2Minor fixes.
- 🆕DAF Delayed Auditory Feedback released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
2.2 ★
10 ratings
Measured
DAF Delayed Auditory Feedback on the App Store
App details
App ID
606979390
Publisher
Junichiro Seyama
On the store since
Mar 2013
13 years on the store
Minimum OS
iOS 15.0+
iPhone 6s and later
Devices
iPhone · iPad
Content rating
12+
1 content note below
Languages
2
EN JA
Size
5 MB
Also listed in
Health & Fitness
Content notesInfrequent/Mild Medical/Treatment Information
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
2.2 ★
10 ratings
Measured
Ratings
10
Measured
About DAF Delayed Auditory Feedback
Try saying "toy boat" repeatedly.
It's hard to say, right? There are many words like this, and if you have to use them during an important presentation, it can be quite stressful.
But with this app, "toy boat" becomes...
**Hugely** difficult to say.
If you thought, "Wait, shouldn't it make it easier to say?" you're wrong. It really becomes **hugely** difficult to say. This is a "who benefits from this?" kind of app.
What this app does is simple. It picks up your voice through the microphone and plays it back through the headphones (or earphones) with a slight delay. That's all it does.
This simple process is called Delayed Auditory Feedback, or DAF for short.
DAF is known to have interesting effects.
It makes it difficult to speak. So, the already difficult "toy boat" becomes **hugely** difficult to say with DAF.
This might seem like a "who benefits from this?" kind of thing, but it's a very interesting phenomenon from a cognitive psychology perspective.
Also, DAF doesn't always make speech difficult; the extent of the disruption varies depending on the amount of delay and the way you speak.
This app is a simple psychological experiment tool that allows you to test when DAF's effects are most pronounced using yourself as the subject.
Experiment with different scenarios using "toy boat" as the keyword.
**Important** When using this app, you must have headphones (or earphones) with a microphone. You cannot substitute the device's built-in microphone and speakers.
I'll say it again.
You cannot substitute the device's built-in microphone and speakers.
**Warning** DAF creates a speech situation different from normal. It is possible that this may cause some stress to your mind and body. We cannot take any responsibility for any issues that arise from using this app. Please understand the principles of DAF fully and use this app at your own risk. If you feel any abnormalities in your mind or body, stop using the app immediately. Additionally, we do not recommend letting minors, especially young children, experience DAF.
**Effect on Stuttering** There are reports that DAF has improved stuttering. However, this app was developed purely as a simple psychological experiment tool to examine how DAF affects the speech of non-stutterers from a cognitive psychology perspective.
It's hard to say, right? There are many words like this, and if you have to use them during an important presentation, it can be quite stressful.
But with this app, "toy boat" becomes...
**Hugely** difficult to say.
If you thought, "Wait, shouldn't it make it easier to say?" you're wrong. It really becomes **hugely** difficult to say. This is a "who benefits from this?" kind of app.
What this app does is simple. It picks up your voice through the microphone and plays it back through the headphones (or earphones) with a slight delay. That's all it does.
This simple process is called Delayed Auditory Feedback, or DAF for short.
DAF is known to have interesting effects.
It makes it difficult to speak. So, the already difficult "toy boat" becomes **hugely** difficult to say with DAF.
This might seem like a "who benefits from this?" kind of thing, but it's a very interesting phenomenon from a cognitive psychology perspective.
Also, DAF doesn't always make speech difficult; the extent of the disruption varies depending on the amount of delay and the way you speak.
This app is a simple psychological experiment tool that allows you to test when DAF's effects are most pronounced using yourself as the subject.
Experiment with different scenarios using "toy boat" as the keyword.
**Important** When using this app, you must have headphones (or earphones) with a microphone. You cannot substitute the device's built-in microphone and speakers.
I'll say it again.
You cannot substitute the device's built-in microphone and speakers.
**Warning** DAF creates a speech situation different from normal. It is possible that this may cause some stress to your mind and body. We cannot take any responsibility for any issues that arise from using this app. Please understand the principles of DAF fully and use this app at your own risk. If you feel any abnormalities in your mind or body, stop using the app immediately. Additionally, we do not recommend letting minors, especially young children, experience DAF.
**Effect on Stuttering** There are reports that DAF has improved stuttering. However, this app was developed purely as a simple psychological experiment tool to examine how DAF affects the speech of non-stutterers from a cognitive psychology perspective.
Latest updates
1.2.2
Minor fixes.
