Comparison

DAF Delayed Auditory Feedback vs Speech Jammer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DAF Delayed Auditory Feedback

This app uses delayed auditory feedback to make speaking difficult by playing your voice back through headphones with a slight delay. It's a tool for psychological experiments, allowing users to test the effects of DAF on their own speech.

Highlights
  • Delayed auditory feedback simulation
  • Voice input via microphone
  • Audio output through headphones
  • Psychological experiment tool
  • Adjustable delay effects
  • Speech disruption testing
Features
Read full description

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.

About

Speech Jammer

This app creates an instant audio feedback loop by delaying your voice, making it difficult to speak fluently. It's a unique and hilarious experience perfect for pranks, brain challenges, and entertainment on the go.

Highlights
  • Instant audio feedback loop
  • Adjustable delay time (50-500ms)
  • Control output volume
  • Fine-tune input sensitivity
  • Toggle headphone/speaker output
  • Hilarious pranks and challenges
Read full description

Get ready for some serious laughs and mind-bending fun with Speech Jammer: Voice Delay App! Have you ever wondered what happens when your own voice gets delayed? This app creates an instant audio feedback loop that messes with your brain, making it almost impossible to speak fluently. It's an incredibly unique and hilarious experience that you have to try to believe! How It Works: It's simple! Just put on your headphones, start the app, and try to read or speak. Your own voice will be played back to you with a slight delay, creating a jarring effect that throws off your normal speech patterns. Prepare for giggles, stutters, and unexpected linguistic challenges! Perfect For: Hilarious Pranks: Watch your friends struggle to speak clearly as their words get scrambled. Perfect for parties, gatherings, or just a good laugh among pals. Mind-Bending Fun: Explore the strange psychology behind speech and auditory feedback. It's a fascinating brain exercise that highlights how our minds process sound. Unique Challenges: See if you can overcome the delay and speak clearly. It's tougher than you think! Entertainment Anywhere: Easy to use and endlessly entertaining, Speech Jammer: Voice Delay App is your go-to for instant fun on the go. Download Speech Jammer: Voice Delay App today and experience the ultimate vocal trick! Are you ready to challenge your speech and have some unforgettable laughs? ■How to Use:Simple Controls Adjust Delay Time (50-500ms) for different effects* Control Output Volume for comfortable listening* Fine-tune Input Sensitivity to prevent feedback* Toggle between headphones and speaker output *Premium features require subscription ■ Subscription Please see below for the terms and conditions of subscription use. 1. Privacy Policy: https://service-agreement-now-on-meet.web.app/en/ 2. Terms of Use: https://app-terms-of-service.web.app/en/

Screenshots

DAF Delayed Auditory Feedback1 screens
Speech Jammer4 screens

Verdict

The call

The clearest difference is rating: Speech Jammer at 4.7 against DAF Delayed Auditory Feedback's 2.3. Speech Jammer also leads on review sentiment (50% vs 20%) and update cadence (every 3 weeks vs every 6 months). DAF Delayed Auditory Feedback's advantage is in-app purchases (none vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Speech Jammer sells 1 in-app purchase, starting at $19.00 per year. DAF Delayed Auditory Feedback asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Speech Jammer holds the better App Store score, 4.7 against 2.3. That said, the two scores are not equally well evidenced: Speech Jammer has 55 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 20% of DAF Delayed Auditory Feedback's written reviews are positive against 50% of Speech Jammer's.

UpkeepUpdate frequency

DAF Delayed Auditory Feedback ships an update every 6 months, Speech Jammer every 3 weeks. The most recent releases landed on September 11, 2026 and September 15, 2026 respectively.

Scorecard6 real differences · 4 level
DAF Delayed Auditory Feedback versus Speech Jammer: the parameters behind the verdict, then further details
ParameterDAF Delayed Auditory FeedbackSpeech Jammer
PriceFreeFree
Rating2.3 (6 ratings)4.7 (55 ratings) — better
Positive reviews20.0% of reviews50.0% of reviews — better
Number of ratings655 — better
Update frequencyEvery 6 monthsEvery 3 weeks — better
AdsYesYes
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.015.0
Further details — not scored
Size5 MB25 MB
Age rating12+4+
DeveloperJunichiro Seyamaryo mishima

Customer experience

DAF Delayed Auditory Feedback

All ratings6 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews10 reviews
Positive20.0%
Neutral10.0%
Negative70.0%

Speech Jammer

All ratings55 ratings
Positive90.9%
Neutral1.8%
Negative7.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

DAF Delayed Auditory Feedback

No in-app purchases

1 purchases

Speech Jammer

Subscriptions1
  • Premium Plan (Yearly)7 Days trial$19.001 Year

Questions

Is DAF Delayed Auditory Feedback free?
DAF Delayed Auditory Feedback is free to download, with no in-app purchases.
Is Speech Jammer free?
Speech Jammer is free to download, with in-app purchases available.
Which has better reviews, DAF Delayed Auditory Feedback or Speech Jammer?
Speech Jammer is rated higher. DAF Delayed Auditory Feedback averages 2.3 out of 5 from 6 ratings, while Speech Jammer averages 4.7 from 55 ratings.
Do DAF Delayed Auditory Feedback or Speech Jammer have ads?
Both DAF Delayed Auditory Feedback and Speech Jammer show ads.
Which is updated more often, DAF Delayed Auditory Feedback or Speech Jammer?
DAF Delayed Auditory Feedback ships an update every 6 months, and Speech Jammer every 3 weeks. Most recently, DAF Delayed Auditory Feedback was updated on September 11, 2026 and Speech Jammer on September 15, 2026.

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