Say It With Your Eyes

Somewhere right now, a person who cannot move their hands and cannot form words is telling a joke. They are looking at a screen, and the screen is speaking for them - reading the flick of their gaze across a grid of symbols and turning it into a sentence out loud. The machine that makes this possible almost certainly came from Tobii Dynavox, a company whose entire product, stripped to its essence, is a human voice.

Tobii Dynavox builds augmentative and alternative communication technology - AAC, in the field's shorthand. That means speech-generating devices, eye-gaze hardware, and communication software for people who cannot rely on their own speech. Its users have conditions like ALS, cerebral palsy, autism, aphasia, stroke and spinal cord injury. Its solutions are used in more than 65 countries, and the company is widely described as the global leader in assistive communication.

The core ideaHow a glance becomes a sentence

The mechanism sounds like science fiction and works like plumbing. A small camera below the screen tracks where the user is looking. When their gaze rests on a symbol, a word or a letter - a technique called dwell - the device registers a selection. String those selections together and the device builds a message, then speaks it aloud. No hands, no keyboard, no speech required at the input end; fluent speech at the output end.

Access is not limited to the eyes. The same software supports touch, physical switches and scanning, so the method meets the user wherever their motor control is strongest. That flexibility is the quiet design philosophy running through the whole catalog: the person should not have to adapt to the machine.

What that unlocks day to day is broader than conversation. A user can compose an email, browse the web, control a phone, write a school assignment, or run parts of a smart home - all from the same gaze or switch input that speaks their words. For many, the device is not a single-purpose speech tool but a general-purpose computer they can finally operate. The difference between saying a sentence and living an independent day often comes down to that overlap.

OriginsForty years from a Carnegie Mellon lab

The lineage is older than most of its users assume. It traces back to 1983 and a device called the EyeTyper, developed at Carnegie Mellon University for people with cerebral palsy. That work became DynaVox, a name familiar to a generation of speech therapists, which went public in 2010 and later hit hard financial trouble.

The Swedish half of the story starts in 2001, when Tobii AB was founded and went on to release an early eye-controlled computer in 2005. In 2014 Tobii acquired DynaVox, joining a mature eye-tracking sensor business to a mature communication-device business. The combined operation was spun back out and listed on Nasdaq Stockholm in December 2021. In mid-2024 the listed parent was renamed Dynavox Group AB, trading under the ticker DYVOX, while Tobii Dynavox continues as the operating brand.

The catalogWhat the company actually makes

The product line splits into devices and software, usually sold together as an integrated solution. TD Snap is the flagship communication app, built around swappable page sets - Core First for symbol-based language, plus Motor Plan, Express, Text and Aphasia versions - and it runs on both dedicated devices and iPad. TD Talk is aimed at literate adults, often people living with ALS, and leans on AI neural voices, including the ability to speak in a synthetic copy of a voice the user banked before they lost it.

Behind the hardware sits a symbol library most people never see but many classrooms depend on. Boardmaker's Picture Communication Symbols number more than 74,000, forming a shared visual vocabulary for AAC and special education. It is, in effect, infrastructure.

The expertiseClinical depth, not just gadgets

The harder part of this work is not the camera; it is the language. Page sets like Core First are built on research into how communication develops and how a vocabulary should be laid out so that the most useful words are the fastest to reach. Motor planning matters too: keeping symbols in consistent positions so a user can build muscle memory and speak faster over time, the way a touch-typist stops looking at the keyboard. Layered on top is voice technology - fast word prediction, neural voices in dozens of languages, and personal voice banking - so that the output does not just say the right words but sounds like a person. This blend of clinical language design, motor-access engineering and speech synthesis is what a device this specialized actually requires.

The marketThe problem, in one hard number

The company estimates roughly 50 million people cannot communicate effectively without aids, and that only about 2% of them currently receive a solution. That gap is the market and the mission at once. It is driven partly by awareness, partly by clinical access, and heavily by funding: figuring out who pays. Tobii Dynavox treats reimbursement as part of the product, running funding support to help clients and clinicians navigate insurance coverage - a step that quietly determines whether a device ever reaches a person.

The businessA good cause that is also a real business

Assistive technology is often assumed to be charity-adjacent. The financials say otherwise. For full-year 2024 the group reported revenue of about SEK 1,972 million - roughly USD 190 million - up 22% year on year, at a gross margin near 69%. Revenue comes from device sales, software licenses and subscriptions, mounting, training and support, sold to schools, clinics, hospitals and resellers as well as directly to individuals and families.

Growth has been fed by acquisition as well as engineering. The company bought Belgian speech-synthesis firm Acapela in 2022, adding its my-own-voice banking technology, and has continued to absorb regional assistive-tech players across Europe and Australia. It partners with Microsoft on neural voices built on Azure AI Speech, and works with ALS advocates such as Team Gleason, the foundation started by former NFL player Steve Gleason.

The fieldWhere it sits among rivals

Tobii Dynavox is not alone. Its closest competitor is PRC-Saltillo, whose Unity language system and NovaChat devices are staples of the AAC world; other names include Smartbox Assistive Technology and its Grid software, Lingraphica, Abilia and Control Bionics. What distinguishes Tobii Dynavox is the depth of its eye-tracking heritage layered onto a full-stack offering - hardware, clinically developed language systems, symbol libraries, training and funding help - under one roof and at global scale.

Who it servesThe people at the center

Behind every specification is a specific human need: a child with cerebral palsy asking to join a game, an adult with ALS keeping their job, a stroke survivor with aphasia reaching for a word that will not come. Hundreds of thousands of people worldwide have used the company's solutions. The devices show up in homes, classrooms, clinics and hospital rooms - anywhere someone needs a way to be understood.

The people around the user matter as much as the user. Speech therapists and special-education teachers rely on the same tools to assess, teach and adjust vocabulary over time; families learn the system alongside the person using it. That is why training and support are bundled into the offering rather than sold as an afterthought - a device that no one around the user knows how to program tends to end up in a drawer. Keeping devices in daily use, not just in the box, is a large part of what the company does. And it is the measure it holds itself to, more than any spec: whether a person who could not be heard, now can.