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.
Funded by BMFTR (2024-2026) · Patent-pending WO2024200875A1
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.
Plug in. Speak fluently.
FluxBuds is a mobile app — iOS first — that turns the wired earbuds you already own into a personal fluency assistant. Stigma-free, discreet, and effective the moment you plug in.
- Real-time, on-device AI — no cloud, low latency (under 30 ms)
- Nothing new to wear — it runs through the earbuds already in your ears.
- Discreet by design — support no one else can see
- Works with earbuds you already own — Apple · Sennheiser · Bose · Sony
Coming soon · iOS first · Android to follow
Not on sale yet. The waitlist is how you hear first.
Two people. Before and after. No editing.
▶ Watch
▶ Watch
Recorded during our pilot at the University of Bamberg.
What people say the first time.
“
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.
Julian, 24
beta participant
We don't change behaviour. We change perception.
Join the FluxBuds® waitlist.
No cost, no commitment. Tell us a little about yourself and we’ll get back to you within one to two working days.
Next study round: — spaces are limited.
Who we're looking for right now
People aged 8 to 45 with moderate to severe stuttering, ideally based in Germany. Not a match yet? Sign up anyway — we’ll come back to you when a study fits.
Where it takes place
The psychology lab at the University of Bamberg — or our mobile lab comes to you.
You can withdraw at any time
Signing up commits you to nothing.
A condition that current care keeps failing.
Stuttering is a neurodevelopmental condition, recognised by the WHO (ICD-10 F98.5). It affects around 1% of people worldwide. Its impact on quality of life sits in the same range as diabetes or heart disease — and of nine established therapies, eight show no lasting improvement in fluency. No medication is approved anywhere.
people who stutter
seek therapy, relief rarely lasts
report anxiety caused by their stuttering
approved medications
Your own voice, turned into someone else's.
When people who stutter speak at the same time as another person, stuttering nearly disappears. It’s called the choral-speech effect, and it’s one of the most reproduced findings in stuttering research. The problem was always that you need a second person.
FluxBuds gives you one. The app takes your voice and, in real time, turns it into a second voice your brain accepts as somebody else:
We call it your Anti-Voice. You hear it over your own voice — the way two real people sound different, come from different places, and never quite synchronise.
“Unconventional paths lead to problems others don’t see — AAF tweaks how you hear yourself; FluxBuds tweaks who you hear.”
Dr. Benno Belke
Co-Founder
Built around one goal: fluency in real life.
Works with your brain, not your willpower
It targets how the brain processes speech. Nothing to concentrate on, nothing to keep up.
Effective from the first sentence
No weeks of training. In our pilot, fluency improved immediately.
Your voice stays yours
Your voice is processed on-device — nothing is sent to the cloud.
It doesn't wear off
Every previous approach faded as the brain adapted. The Anti-Voice keeps changing, so it stays effective.
What we know — and what we don't.
The effect is well established. The choral-speech effect is documented across more than 30 peer-reviewed studies and six independent research areas, including brain imaging that localises it.
Our pilot is promising, and it is small. An independent, publicly funded pilot at the University of Bamberg with 12 participants: all four measures moved in the predicted direction — fluency, speaking speed, naturalness and mental effort.
The decisive study is still ahead. A randomised trial has to show how strong the effect is and who responds. We’d rather say that than promise more than we can prove.
Frequently asked.
Does this replace speech therapy?
No. FluxBuds supports fluency while you wear it. It’s not a replacement for therapy, and we’d never suggest stopping something that works for you.
Will it work for me?
The choral-speech effect works for nearly everyone it’s been tested on. How much FluxBuds helps you personally is exactly what the upcoming study is designed to find out.
What do I need?
An iPhone and wired earbuds — the ones you already own are fine. Apple, Sennheiser, Bose and Sony all work.
What does it cost, and when can I get it?
Taking part in the study costs nothing. The product isn’t on sale yet — the waitlist is how you hear first.
What happens to my voice?
Your voice is processed on-device — nothing is sent to the cloud.
Am I eligible?
Right now we’re looking for people aged 8 to 45 with moderate to severe stuttering, preferably in Germany. Sign up regardless — studies change.
What do I get out of taking part?
You’re among the first to use the technology, and participants have the option of receiving the finished product as beta testers.
How do I withdraw?
Write to us. The list is informal and commits you to nothing.
Clinicians · partners · investors
Talk to the founders about pilots, partnerships or investment.
The information on this page is provided for general information only and does not constitute medical advice, a medical claim, or a promise or guarantee of any particular outcome. References to products or technologies still in development are forward-looking and subject to change. FluxBuds® is a registered trademark of PsyAiHance GmbH.