Population
Understanding the scale and distribution of hearing loss is critical to building technology that serves real needs. InReach is designed for the 1.5 billion people experiencing hearing loss globally—with a focus on the 70 million deaf individuals who rely on sign language as their primary means of communication.
Global Statistics
- 1.5 billion people experience some degree of hearing loss globally
- 430 million people require rehabilitation for disabling hearing loss
- 70 million people are profoundly deaf
- 12[1]-24[2]-25[3] million people primarily use sign languages for communication
Hearing Loss Spectrum[4]
The World Health Organization (WHO) reports that 1.5 billion people live with some degree of hearing loss—a number projected to reach 2.5 billion by 2050. This growth is driven by aging populations, unsafe listening practices, limited healthcare access, and insufficient early intervention.
Of these, 430 million people experience disabling hearing loss requiring rehabilitation. By 2050, this is expected to grow to 700 million people.
Economic Impact
The WHO estimates that unaddressed hearing loss costs the global economy $980 billion annually, including healthcare costs, educational support, lost productivity, and societal impact.
For InReach, this represents both a massive human need and a substantial market opportunity.
Hearing Loss Classification[5]
Hearing loss is measured per ear using the following grades:
| Grade | Hearing Loss (dB) | Description |
|---|---|---|
| 0: No impairment | 0–25 dB | Normal hearing |
| 1: Slight impairment | 26–40 dB | Difficulty in noisy settings; can hear normal speech at 1 meter |
| 2: Moderate impairment | 41–60 dB | Requires raised voice at 1 meter; struggles with conversation |
| 3: Severe impairment | 61–80 dB | Can hear only shouted speech; significant communication barriers |
| 4: Profound/Deaf | >80 dB | Cannot hear even shouted speech; relies on visual communication (sign language, lip-reading, or captions) |
InReach targets grades 3-4: individuals who cannot access audio content through hearing alone and require visual communication methods.
Deaf Community[6]
The World Federation of the Deaf (WFD) estimates approximately 70 million profoundly deaf people worldwide. This community communicates across 200+ distinct sign languages[7], reflecting the linguistic and cultural diversity of deaf populations globally.
Key insight for InReach: Sign languages are not universal. American Sign Language (ASL) differs entirely from British Sign Language (BSL), French Sign Language (LSF), and others—requiring multilingual support in our translation systems.
Sign Language Users
Reliable data on sign language usage is challenging to obtain due to varying definitions and data collection methods. Current estimates range from 12 to 25 million primary sign language users:
- 12 million: European Centre for Modern Languages estimate (~0.16% of global population)[1:1]
- 24 million: Ethnologue estimate of native sign language users[2:1]
- 25 million: Aggregate of top 100 sign languages by user count[3:1]
For InReach's market sizing: We conservatively estimate 12-25 million primary sign language users as our core addressable market, with the broader 1.5 billion people with hearing loss as our total addressable market (most use captions, hearing aids, or other accommodations).
Hearing Sign Language Users
Not all sign language users are deaf. Hearing individuals who use sign language fluently include:
- Children of Deaf Adults (CODAs)[8]: Hearing children raised in deaf households, often bilingual in sign and spoken languages
- Sign language interpreters: Professionals and trainees with advanced signing skills
- Family members: Parents, siblings, and spouses of deaf individuals
- Educators and service providers: Teachers, social workers, healthcare providers working with deaf clients
- Language learners: Individuals studying sign language for academic, cultural, or personal interest
This broader group helps explain why some estimates (like Ethnologue's 24 million[2:2]) are higher than deaf-only counts.
For InReach: Hearing sign language users represent an additional market segment—people who want to learn sign language, communicate with deaf family/friends, or work as interpreters can benefit from our technology for practice, learning, and communication support.
Market Implications for InReach
Primary Market (Core Users):
- 70 million deaf people: Cannot access audio/video content without visual translation
- 12-25 million sign language users: Primary communication method is sign language
Secondary Market (Potential Users):
- 430 million with disabling hearing loss: Many use captions but would benefit from sign language
- 1.5 billion with hearing loss: Growing market as hearing loss worsens with age
Tertiary Market (Adjacent Users):
- Hearing sign language users: CODAs, interpreters, families, educators, learners
- Platforms and institutions: Required to provide accessibility under ADA, EU Accessibility Act, etc.
The Gap We're Filling:
- Interpreter shortage creates access barriers for everyday digital content
- Captions are inadequate (3-second delay, not native language, exhausting to read)
- No existing technology provides real-time sign language for any digital content
- $980 billion annual cost of unaddressed hearing loss globally
InReach's unique position: First universal solution for real-time sign language access to any digital content—no platform redesign, no interpreter scheduling, no caption delays.
European Centre for Modern Languages. 2024. Facts about sign language. ↩︎ ↩︎
Derivation. 2022. International Day of Sign Languages 2022. ↩︎ ↩︎ ↩︎
Shester Gueuwou. 2023. Sign Language Info. ↩︎ ↩︎
World Health Organization. 2021. Fact Sheet: Deafness and Hearing Loss. ↩︎
World Health Organization. 1991. Report of the informal working group on prevention of deafness and hearing impairment programme planning. ↩︎
United Nations. 2024. International Day of Sign Languages. ↩︎
Medical Life Sciences. 2025. Children of Deaf Adults (CODA). ↩︎