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Like glasses. But for speech.
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FluxBuds® by PsyAIHance
Like glasses. But for speech.

The world's first AI-powered wearable that lets people who stutter speak fluently — in real life, in real time, no training required.

How it works
Book Demo Day
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FluxBuds® is a novel, AI-driven sensory technology designed to support speech fluency in real time — developed on the foundation of psychological science, neuroscience, and adaptive audio AI.

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The Mechanism
Why it works —
and why it feels effortless.

Stuttering isn't a habit, a weakness, or an anxiety disorder. It's a neurobiological disruption in how the brain monitors its own voice. FluxBuds targets that disruption at the source.

1

You speak. Your voice is captured.

FluxBuds' built-in microphone picks up your voice in real time — before it reaches your ears through air.

2

AI converts it to "other voice" feedback.

FluxBuds' built-in microphone picks up your voice in real time — before it reaches your ears through air.

3

The brain takes a different pathway.

FluxBuds' built-in microphone picks up your voice in real time — before it reaches your ears through air.

4

You speak fluently. Effortlessly.

FluxBuds' built-in microphone picks up your voice in real time — before it reaches your ears through air.

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Unconventional paths lead to problems others don't see — aAAF tweaks how you hear yourself; FluxBuds tweaks who you hear.

Dr. Benno Belke
Co-Founder
MORE
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Hardware Platform
Earbud form factor.
Clinical-grade output.

Embedded in mainstream earbud hardware — cosmetically indistinguishable from consumer devices. Stigma-free adoption by design, not by coincidence.

✔️ No language model required

✔️ Adaptive anti-habituation parameter tuning

✔️ On-device ML — zero cloud dependency

✔️ Full speech intelligibility preserved

✔️ Age 8+ — all severity classifications

Join Waitlist
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Key Benefits
Built around one goal:
real-world fluency.

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1
Neuro-Efficient
Designed around how the brain actually processes speech — not around behavioral workarounds that fade under pressure.
2
Instant Effect
No weeks of training. Pilot data shows substantial fluency improvement immediately — in the first session.
3
Private by Design
All processing happens on the device. Your voice is never uploaded, stored, or shared. Privacy is a feature, not a policy.
4
Anti-Adaptation
The AI continuously adjusts to prevent the brain from habituating to the feedback — so the effect stays consistent over time.
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300+

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10,500+

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Top 2%

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Live Demo
See the effect. In real time.

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Watch Now

Watch: a first-time user trying FluxBuds — before & after, no editing.

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Early User Voices
What people say the first time
they use FluxBuds.

I cannot recall having heard my son speak so fluently in a long time, if ever. The improvement is truly astonishing.

Noah, 42 — father of Marcus, 10

I've been in and out of speech therapy for years. While using this, I find myself expressing thoughts and ideas effortlessly.

Daniel, 30 — Beta participant

The effect is truly perplexing — my speech became smoother and I felt immediately more in control of my communication.

Julian, 24 — Beta participant

I cannot recall having heard my son speak so fluently in a long time, if ever. The improvement is truly astonishing.

Noah, 42 — father of Marcus, 10

I've been in and out of speech therapy for years. While using this, I find myself expressing thoughts and ideas effortlessly.

Daniel, 30 — Beta participant

The effect is truly perplexing — my speech became smoother and I felt immediately more in control of my communication.

Julian, 24 — Beta participant
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The Science
300+ publications.
One mechanism.

With FluxBuds - Without FluxBuds (click on the photo)

FluxBuds is built on the Leder-Belke model of aesthetic processing and decades of perception research — specifically the discovery that the brain processes self-voice and other-voice through fundamentally different neural pathways.

In people who stutter, the Auditory Self-Speech Feedback Loop is disrupted: the brain incorrectly monitors its own voice production, creating interference in the STG (Superior Temporal Gyrus). This interference triggers blocking and repetition.

FluxBuds activates an ego-dystonic voice conversion: your voice is transformed in real time to be perceived as "other." The brain then routes processing through the Other-Speech Pathway — bypassing the impaired self-monitoring circuit entirely. Motor execution is freed.

300+

Peer-reviewed publications

10,500+

Citations
worldwide

Top 2%

Scientists
worldwide (CSO)

Voice conversion
latency

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What's Next
Same platform. New domains.
The technology behind FluxBuds is designed to generalize. Here's where we're heading next.
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Concept & Exploratory Research

Technology: Audio & Speech
Target: Human–Robot Interaction (HRI)

Persona™ (Privacy-first edge module for HRI)

Voice is the most natural interface for robots — and the hardest to deploy responsibly. In real-world Human–Robot Interaction, microphones are effectively always-on, conversations happen in shared spaces, and speech signals often flow through multiple components (wake word, ASR, intent, logging, analytics). Even when audio isn’t “stored,” raw voice can still function as a biometric identifier and can leak sensitive context through transcripts or downstream representations.

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Founder Interview
"Perception is editable."

Berlin, late afternoon. Two espresso cups. One pair of earbuds on the table. A conversation with Dr. Benno Belke and Prof. Dr. Claus-Christian Carbon.

PM

Let’s begin with the elevator pitch—but make it the kind that doesn’t make people flee into the stairwell.

BB

We’re building a speech prosthesis—not a “practice app” that nags you like a fitness tracker. FluxBuds is designed to work while you speak, in real life, in real conversations. Think: correcting speech as naturally as correcting vision with glasses.

CCC

And we’re doing it with something perception science has always known: the brain doesn’t just hear—it interprets. If you change what the brain believes it’s hearing in the right way, you can change what happens next in the whole speech loop.

PM

Let’s begin with the elevator pitch—but make it the kind that doesn’t make people flee into the stairwell.

BB

We’re building a speech prosthesis—not a “practice app” that nags you like a fitness tracker. FluxBuds is designed to work while you speak, in real life, in real conversations. Think: correcting speech as naturally as correcting vision with glasses.

CCC

And we’re doing it with something perception science has always known: the brain doesn’t just hear—it interprets. If you change what the brain believes it’s hearing in the right way, you can change what happens next in the whole speech loop.

PM

Let’s begin with the elevator pitch—but make it the kind that doesn’t make people flee into the stairwell.

PM

Let’s begin with the elevator pitch—but make it the kind that doesn’t make people flee into the stairwell.

BB

We’re building a speech prosthesis—not a “practice app” that nags you like a fitness tracker. FluxBuds is designed to work while you speak, in real life, in real conversations. Think: correcting speech as naturally as correcting vision with glasses.

CCC

And we’re doing it with something perception science has always known: the brain doesn’t just hear—it interprets. If you change what the brain believes it’s hearing in the right way, you can change what happens next in the whole speech loop.

PM

Let’s begin with the elevator pitch—but make it the kind that doesn’t make people flee into the stairwell.

BB

We’re building a speech prosthesis—not a “practice app” that nags you like a fitness tracker. FluxBuds is designed to work while you speak, in real life, in real conversations. Think: correcting speech as naturally as correcting vision with glasses.

CCC

And we’re doing it with something perception science has always known: the brain doesn’t just hear—it interprets. If you change what the brain believes it’s hearing in the right way, you can change what happens next in the whole speech loop.

Read the full interview

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12 MIn Lesezeit, ....

Meet the Founders
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Founder Interview
"Perception is editable."

Berlin, late afternoon. Two espresso cups. One pair of earbuds on the table. A conversation with Dr. Benno Belke and Prof. Dr. Claus-Christian Carbon.

Meet the Founders
PM

Let’s begin with the elevator pitch—but make it the kind that doesn’t make people flee into the stairwell.

BB

We’re building a speech prosthesis—not a “practice app” that nags you like a fitness tracker. FluxBuds is designed to work while you speak, in real life, in real conversations. Think: correcting speech as naturally as correcting vision with glasses.

CCC

And we’re doing it with something perception science has always known: the brain doesn’t just hear—it interprets. If you change what the brain believes it’s hearing in the right way, you can change what happens next in the whole speech loop.

PM

Let’s begin with the elevator pitch—but make it the kind that doesn’t make people flee into the stairwell.

BB

We’re building a speech prosthesis—not a “practice app” that nags you like a fitness tracker. FluxBuds is designed to work while you speak, in real life, in real conversations. Think: correcting speech as naturally as correcting vision with glasses.

CCC

And we’re doing it with something perception science has always known: the brain doesn’t just hear—it interprets. If you change what the brain believes it’s hearing in the right way, you can change what happens next in the whole speech loop.

Read the full interview

nfjbdjfbdjfnjdnk,s
12 MIn Lesezeit, ....

Frequently Asked Questions

What is the purpose of the study?

The study aims to identify the most effective, persistent, and sensorially pleasant ways to enhance speech fluency. Therefore, the study is concerned with the overall contribution to reduce stuttering over short and longer periods of time as well.

What is the scientific background of our study?

The research group at PsyAIHance has successfully identified a brain mechanism that offers a bypass route around the neural impairments commonly associated with stuttering. Leveraging the cutting-edge capabilities of machine learning, the team has engineered sophisticated audio algorithms capable of activating this brain mechanism. Remarkably, this intervention facilitates an immediate improvement of speech fluency, achieved through a subtle auditory modification, in a very reliable and efficient manner.

Who is eligible?

We are specifically seeking individuals between the ages of 8 and 45 with a moderate to severe stutter, preferably living in Germany.

What benefit do I gain from participating in the study?

As a participant, you will benefit from being among the first to experience FluxBuds technology firsthand. Additionally, you will have the privileged option to receive the final product as a beta tester.

Where does the study take place?

The study is conducted either in the Psychology Lab of the University of Bamberg. It is also possible to come to your location with our Mobile Lab.

How will I know if I qualifiy to participate?

After receiving your request, our team will review your information and reach out to you within 1-2 working days. We’ll discuss conjointly your eligibility and potential involvement in either our current or upcoming studies.

Can you tell me about upcoming clinical trials?

Yes, you can let us know that you are interested and we will get back to you, once a new trial is in preparation.

How do I withdraw my application for the study?

The registry is informal and does not oblige to any participation. Withdrawing for whatever reason is possible at any time.

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