1.2.9 Audio-only (Live)

1. What is the goal of this criterion?

Live is live – and that makes a lot of things harder. With a prerecorded podcast you can calmly put together a transcript, but with an audio live stream, a press conference without video or a web radio show, it gets tricky.

People who are deaf or hard of hearing face a particular hurdle with live audio: there’s no replay and no pause button. Whatever was said and not written down is lost to them.

So the goal of WCAG Success Criterion 1.2.9 is to make live audio-only content accessible too – through a text alternative that’s created alongside the spoken word.

2. What exactly does it require?

This Level AAA criterion is about audio-only content broadcast live. It needs an equivalent text alternative that’s available at the same time as the audio.

Typical solutions:

• Real-time captioning (CART): trained captioners transcribe what’s said as it happens.
• Prepared text: if a broadcast follows a fixed script, such as a statement being read out, that script can be provided in parallel – as long as nobody departs from it.
• Text display on the website: the text runs in an area next to the audio player.

Important clarifications:

• The criterion is meant for broadcasts such as webcasts, web radio or audio live streams – not private conversations between individuals.
• Responsibility lies with the person or organisation providing the content – not with the software being used.
• The text alternative has to be equivalent: rough notes or an unchecked, error-ridden transcript won’t do.

3. Why does it matter for accessibility?

Imagine your company’s leadership makes a short-notice statement about a crisis via an audio live stream – but you’re deaf and can’t follow what’s being said while everyone else reacts.

Live text alternatives enable participation in real time:

• Deaf and hard of hearing people can follow live broadcasts, audio conferences and webcasts in full.
• People in noisy environments can keep up even without headphones.
• People with attention or processing difficulties benefit from being able to listen and read at the same time.
• People with a different first language understand complex content better when they can combine text and audio.
• People in quiet places (a library, a sleeping household) can still take part.

What makes the difference: unlike transcripts created afterwards, live text alternatives enable real participation – you’re actually there, rather than reading a recording later.

4. How to meet the criterion

Live text is more demanding than an after-the-fact transcript – but with planning and the right services it’s very doable. Your options:

Professional real-time captioning:

• Hire live captioners or a specialist live captioning service.
• They work on site or remotely and capture not only speech but also important sounds: [applause], [laughter], [music].
• Share names, technical terms and the running order in advance – it noticeably improves quality.
• Ideal for official events, conferences or important addresses.

Technical implementation:

• Embed the live text right next to the audio player on your website, for example using the embed the service provides.
• Make sure it’s easy to read: sufficient contrast, appropriate font size, adjustable display.
• Offer a text-only view for anyone who just wants to follow the text.

For planned broadcasts:

• If there’s a fixed script, provide it in parallel – and flag any deviations.
• Combine prepared text with live text for spontaneous parts such as Q&A sessions.
• Test the setup beforehand: is everything in sync? Is the text easy to read?

Automatic speech recognition:

• Many platforms and operating systems now offer automatic live captions – such as Microsoft Teams, Zoom, Google Live Transcribe or the live captions built into Windows and smartphones.
• For internal or spontaneous formats they’re a good first step.
• But: with jargon, names, accents or several voices they make mistakes. You need to check critically whether the result is equivalent – often it takes human correction.
• Captions that users switch on themselves on their own device don’t replace your responsibility as the provider to offer a text alternative.

For live video with picture and sound, Captions (Live) already applies at Level AA; for prerecorded audio, see Audio-only and Video-only (Prerecorded).

5. Why this criterion matters for businesses

Level AAA may sound like a luxury – but with live formats in particular, accessibility decides who gets to be part of it and who doesn’t:

1. Reach more people

An audio event without live text excludes deaf customers, employees and partners. With live text alternatives, your events become accessible to everyone – including people in difficult listening situations.

2. Communicate reliably

With important announcements – crisis communication or shareholder meetings, for instance – what matters is that everyone gets the same information at the same time. Live text makes sure of that and keeps a record of what was said.

3. Reuse your content

After the broadcast, the live text becomes a searchable transcript with little extra work – a basis for articles, documentation or summaries.

On the legal side: what the law usually requires is Level AA. The European Accessibility Act has applied since 28 June 2025 – in Germany through the Barrierefreiheitsstärkungsgesetz (BFSG) – and relies on EN 301 549, which refers to WCAG 2.1 Level AA for web content. 1.2.9 isn’t part of the mandatory scope. (General information, not legal advice.)

6. The success criterion in the W3C’s words

Success Criterion 1.2.9 Audio-only (Live) (Level AAA)

An alternative for time-based media that presents equivalent information for live audio-only content is provided.

In short: live audio-only content comes with an equivalent text alternative – for example through real-time captioning or a script provided in parallel.