Captio AI
🦻 Accessibility + 💻 Productivity App

Tamil live captions and productivity tool for phone & video calls

For deaf and hard of hearing people.

Download for free

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Captio AI app showing live captions

Download for free

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Use Cases

Every situation covered

Designed for the real moments that matter — not just quiet controlled environments.

👨‍👩‍👧Calls with family and friends

A call with parents or grandparents in Chennai or a relative in Madurai. Family conversations carry regional Tamil accents and the shorthand of close relationships. Captio AI captions everything said.

💼Work calls and conference calls

A project call run in Tamil from a Chennai IT company or an online meeting with Tamil colleagues. Business Tamil with English technical vocabulary. Captio AI keeps pace with both.

🏥Medical and healthcare calls

A callback from Apollo Hospital in Chennai or a query from the neighborhood medical shop in Tamil. Medical calls use formal vocabulary at speed. Captio AI shows the full message in text.

🏦Banks, utilities, and customer service

An Indian Bank automated menu or a TNEB bill payment call in Tamil. Automated menus give you one chance. Captio AI captions each option before the timeout.

🌍International calls

A call from the Tamil diaspora in the UK, Canada, Australia, or Malaysia. Diaspora Tamil carries foreign-language influence on vocabulary and rhythm. Captio AI handles it accurately.

📹Video calls — FaceTime, WhatsApp, Zoom

A WhatsApp video call with family in Coimbatore or a Zoom meeting with a Sri Lankan Tamil team. All video call apps work the same way — put the call on speaker, open Captio AI, read the captions.

Performance

Most accurate and fastest models

Tamil
90.4%

word accuracy

independent benchmark, 2025

< 200ms
you speak
captions

real-time captions

first word appears as you speak

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Captio AI in everyday use
Why Captio AI

Built for the calls you have been avoiding

Captions as they speak

Words appear on screen word by word while the other person is still talking. You read what they say at the same pace everyone else hears it — no delay, no reconstruction.

Works on any call app

Captio AI does not need to integrate with any platform. Put the call on speaker, point the microphone toward the audio, and read the captions. It works the same way for any app on any device.

No more asking for repeats

Every word is on screen as it is said. If you missed something, glance at the caption rather than interrupting the call — the full sentence is there.

Handles call audio accurately

Compressed phone audio is less clean than in-person speech. Captio AI is built for real-world audio conditions, including the reduced quality of standard phone and VoIP calls.

Any language

For calls with family abroad, international colleagues, or foreign-language customer service. Live Translator captions and translates in real time with no manual setup.

Record and review after

Record any call and upload it to Audio Transcription. Get a full written record of everything said — useful for medical instructions, work decisions, and anything worth having in writing.

Tamil

Why Tamil is hard to understand

Diglossia: two registers, one call

  • Formal and spoken Tamil are linguistically distinct
  • Tamil has a formal literary register (used in official calls, news, and formal medical contexts) and a spoken/colloquial register that differ in vocabulary, verb forms, and even basic pronouns. A deaf caller tracking phonological shapes from everyday conversation will not recognize the formal register on an official or medical call — and formal Tamil callers do not adapt to spoken Tamil automatically.

Three-way retroflex series

  • Dental, alveolar, and retroflex consonants look identical
  • Tamil has three series of dental-alveolar-retroflex stops and nasals (த/ற/ட, ந/ன/ண). The retroflex consonants (ட, ண, ழ, ள) are produced by curling the tongue back against the palate — with no visible lip change. These three-way contrasts are phonemically important, completely invisible on lips, and distinguishable only by sound.

India-Sri Lanka dialect gap

  • Indian Tamil and Jaffna Tamil are phonologically distinct
  • Sri Lankan Tamil (spoken in Jaffna, Colombo, and Trincomalee) maintains archaic consonant contrasts, different vowel lengths, and distinct vocabulary compared to Indian Tamil varieties. A deaf caller from Chennai may not recognize the phonological shape of Jaffna Tamil on an international call — the two varieties have diverged significantly over centuries.

Vowel length collapse in fast speech

  • Three vowel lengths merge under speed and compression
  • Tamil has three vowel lengths (short, long, overlong) plus diphthongs, and these distinctions change word meaning. In fast casual speech, length distinctions collapse — particularly between short and long. On a phone call without hearing, the duration signal that separates vowel length categories is compressed by codecs and lost entirely.

Tamil-English code-switching

  • Urban Tamil shifts phonological systems mid-sentence
  • Urban Tamil speech in Chennai and among the diaspora switches rapidly between Tamil and English within single sentences. The phonological system shifts with each language — requiring a deaf caller to simultaneously track Tamil vowel harmony and consonant system in one moment, and English phonology in the next, without a boundary marker.

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The Challenge

Sixty-three million deaf and hard of hearing people in India — and Tamil Nadu records among the highest rates in the south

India is home to approximately 63 million deaf and hard of hearing people, with hearing disability the second most common disability in the country. NFHS-5 (2019–21) data shows that Tamil Nadu consistently records higher hearing disability rates than many northern states, with southern states as a cluster showing elevated prevalence. In Sri Lanka, WHO regional estimates place significant hearing loss at around 2–3% of the population — a meaningful number in a country of 22 million.

Tamil Sign Language (TSL) is used in deaf communities in Tamil Nadu and by Sri Lankan Tamils, with the two variants differing substantially. The Tamil Nadu state government has established cochlear implant programs for newly diagnosed children — but the large adult population with hearing loss navigates telephone communication without formal support. There is no mobile relay telephone service available through Jio, BSNL, or Dialog (Sri Lanka) for deaf Tamil callers. Indian Sign Language interpreters remain scarce outside Chennai.

Captio AI lets a deaf Tamil speaker in Coimbatore follow an Apollo Hospital callback, navigate an Indian Bank automated menu, or join a WhatsApp video call with family in Jaffna — reading accurate Tamil captions in real time, without relay infrastructure or interpreter availability.

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Privacy

What you hear stays with you.

Gone the moment it ends

Captio AI processes your audio in real time and discards it immediately. Nothing is recorded. Nothing is kept.

Not a product

Your conversations are not something Captio AI sells, shares, or monetizes — to anyone, for any reason.

Not used to train anything

What you say in a doctor's appointment or a job interview never ends up in a training dataset. Not ours. Not anyone else's.

100% PRIVATE

Private by default

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Reviews

People love Captio AI

"Apollo Hospital callbacks are in formal Tamil — completely different from the Tamil I speak at home in Chennai. Captio AI handles the formal register accurately. I understood my consultant's instructions without asking for a repeat."

Kavitha R. 🇮🇳
kavitha.r***@gmail.com
Moderate hearing loss, Chennai

"Sri Lankan Tamil and Indian Tamil sound different enough that I struggle on calls from Chennai relatives. Captio AI reads Jaffna Tamil accurately. WhatsApp calls with relatives in Chennai are readable now."

Murugan S. 🇱🇰
murugan.s***@gmail.com
Sensorineural hearing loss since birth, Jaffna

"Tamil-English code-switching in diaspora calls — my UK Tamil community switches between Tamil and English mid-sentence constantly. Captio AI follows both. I'm in every WhatsApp call now instead of dropping off because I can't follow."

Priya A. 🇬🇧
priya.a***@gmail.com
Hard of hearing, London

"Indian Bank IVR menu in Tamil — the retroflex consonants like ட and ண sound the same to me now. Captio AI shows the correct text. I handle my own banking calls without my son having to do them for me."

Selvam K. 🇮🇳
selvam.k***@gmail.com
Age-related hearing loss, Coimbatore

"Apollo Hospital callbacks are in formal Tamil — completely different from the Tamil I speak at home in Chennai. Captio AI handles the formal register accurately. I understood my consultant's instructions without asking for a repeat."

Kavitha R. 🇮🇳
kavitha.r***@gmail.com
Moderate hearing loss, Chennai

"Sri Lankan Tamil and Indian Tamil sound different enough that I struggle on calls from Chennai relatives. Captio AI reads Jaffna Tamil accurately. WhatsApp calls with relatives in Chennai are readable now."

Murugan S. 🇱🇰
murugan.s***@gmail.com
Sensorineural hearing loss since birth, Jaffna

"Tamil-English code-switching in diaspora calls — my UK Tamil community switches between Tamil and English mid-sentence constantly. Captio AI follows both. I'm in every WhatsApp call now instead of dropping off because I can't follow."

Priya A. 🇬🇧
priya.a***@gmail.com
Hard of hearing, London

"Indian Bank IVR menu in Tamil — the retroflex consonants like ட and ண sound the same to me now. Captio AI shows the correct text. I handle my own banking calls without my son having to do them for me."

Selvam K. 🇮🇳
selvam.k***@gmail.com
Age-related hearing loss, Coimbatore

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FAQ

Frequently asked questions

Follow every call in Tamil.

Captio AI is free to start

Download for free

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