English live captions and productivity tool for phone & video calls
For deaf and hard of hearing people.
coming soon
Download for free
Download on theApp Store
Everything you need to follow English phone & video calls
Four tools built for deaf and hard of hearing English speakers.
Follow the call in real time
- Captions appear word by word as the other person speaks
- Works on any call — no app integration required
- Put the call on speaker and point the microphone toward it
- Handles compressed call audio accurately
International and foreign-language calls
- They speak their language — you read in yours
- Translates in real time as they speak
- 60+ languages, no setup
- For family abroad, international business, or travel
Transcribe any call recording
- Record the call and upload for a complete written transcript
- Review instructions, information, and decisions after
- Organised by speaker
- Works on any call recording
Key information extracted from any call
- Important points pulled from any call transcript
- Useful for medical calls, customer service, and work calls
- Organised into clear sections
- Works on any saved recording
Download for free
Download on theApp StoreEvery situation covered
Designed for the real moments that matter — not just quiet controlled environments.
A catch-up call with a parent, a friend who doesn't know to slow down, a sibling calling from a noisy street. English family calls happen at full speed in any accent, with half-finished sentences and no warning.
A one-on-one with a manager, a team stand-up, a client update. English-medium work culture runs heavily on calls — a quick 'can you jump on a call?' is the default format for anything faster than email.
An NHS callback, a GP result, a pharmacy query, an appointment confirmation. Healthcare in the UK and US relies on phone for results and prescriptions — high-stakes calls where missing one word about a dosage has real consequences.
Bank security verification, automated IVR menus, insurance claims, utility billing disputes. English-language customer service is phone-first, with fast-speaking agents and automated systems that wait seconds for input.
A call from an international colleague, a customer with an unfamiliar regional accent, a business contact in Australia or Canada. Global English accent diversity multiplies on top of phone compression.
FaceTime with family, WhatsApp calls with friends, Zoom meetings with colleagues. Even with video available, lip reading at pace on a compressed stream is exhausting. Captions let you watch the person, not decode their mouth.
Most accurate and fastest models
word accuracy
independent benchmark, 2025
real-time captions
first word appears as you speak
Download for free
Download on theApp Store
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.
Why English is hard to understand
Homopheme density
- Many English consonants look identical on the lips
- English has a high density of minimal pairs that are visually indistinguishable — 'park', 'bark', and 'mark' produce the same lip movement. On a phone call, the visual channel is gone entirely. The full cognitive load falls on compressed audio with nothing to fall back on.
Fricative collapse
- Phone compression strips English's fricatives first
- English relies heavily on fricative consonants — /f/, /v/, /θ/, /ð/, /s/, /z/, /ʃ/, /ʒ/. Narrowband phone audio (300–3400 Hz) strips the high-frequency information these sounds depend on, making 'think', 'sing', and 'thing' near-identical on a compressed line.
Accent diversity
- No two English accents sound alike on a call
- Scots, Geordie, Birmingham, RP, General American, Boston, Southern US — each accent places phonemes differently. On a phone call, a deaf caller calibrated to one variety faces a shifted phonological system with no visual anchor.
Fast speech reductions
- Casual English systematically drops syllables
- 'Probably' becomes 'probly', 'going to' becomes 'gonna', 'I don't know' becomes 'dunno'. These reductions appear in every informal register — family calls, work check-ins, customer service — at the speaker's natural pace, not the listener's.
Coarticulation blur
- Connected English blurs word boundaries at speed
- 'Did you eat yet?' runs into a single continuous sound at natural pace. Word boundaries that help a deaf person parse individual words disappear in fast connected English, leaving a dense acoustic stream with no visual segmentation.
Download for free
Download on theApp StoreEighteen million people with hearing loss in the UK alone
A 2024 analysis based on UK census data estimates that 18 million people in the United Kingdom have some degree of hearing loss — one in three adults. Of these, 12.3 million have bilateral loss affecting both ears. According to RNID's 2023 Health and Wellbeing Survey, 87% of people with hearing loss say it affects their daily communication, work, and relationships, and 62% report isolation or reduced confidence as a direct consequence.
Phone communication is the sharpest point of that exclusion. Research published in 2025 found that 55% of deaf respondents cite anxiety or frustration when relying on others to make calls on their behalf. More seriously, 20% of deaf and 24% of hard of hearing people surveyed said they had serious concerns that communication barriers would prevent them from reaching healthcare in an emergency. The phone call that arranges a GP appointment, reports a side effect, or clarifies a prescription is not optional — and for one in five deaf people, it is a genuine risk.
Captio AI is built for those calls. Put any English phone call on speaker — an NHS callback, a bank security check, a catch-up with a family member across an accent divide — and read the captions in real time. No relay operator, no third party, no asking anyone to slow down.
Download for free
Download on theApp StoreWhat 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.
Private by default
Download on theApp StoreCaptio AI supports 60+ languages
People love Captio AI
"NHS callbacks were my biggest dread. I'd miss the doctor's name, the medication, the follow-up time. Now I put the call on speaker and read every word as it's spoken. I haven't needed to ring back for clarification once."
"Eight people on a conference call in different American accents — I used to catch maybe half. Captio AI on speaker and I follow everyone. I actually contribute in calls now instead of nodding and hoping I didn't miss something important."
"Video calls with my team in London were the hardest part of remote work — different accents, everyone talking fast. The captions appear before I've even looked up from my screen. I follow every call now."
"My bank locked my account and told me to call them. A year ago I would have asked someone else to make that call. I put it on speaker, answered every security question myself, got it sorted. That felt significant."
"NHS callbacks were my biggest dread. I'd miss the doctor's name, the medication, the follow-up time. Now I put the call on speaker and read every word as it's spoken. I haven't needed to ring back for clarification once."
"Eight people on a conference call in different American accents — I used to catch maybe half. Captio AI on speaker and I follow everyone. I actually contribute in calls now instead of nodding and hoping I didn't miss something important."
"Video calls with my team in London were the hardest part of remote work — different accents, everyone talking fast. The captions appear before I've even looked up from my screen. I follow every call now."
"My bank locked my account and told me to call them. A year ago I would have asked someone else to make that call. I put it on speaker, answered every security question myself, got it sorted. That felt significant."
Download for free
Download on theApp StoreFrequently asked questions
Follow every call in English.
Captio AI is free to start
coming soon
Download for free
Download on theApp Store