Line 21
dashboard

How we use AI

AI runs through every stage of a live caption, from the first word heard to the last voice dubbed. Each step is a service you can switch on, tune or leave to a human.

Six ways we use AI

  1. 01

    Speech recognition

    Speech-to-text models turn live audio into captions. Line 21 recommends the best engine for each language and lets you switch; some engines also tell speakers apart and follow conversations that change language.

    EnginesSpeechmaticsDeepgramGladiaAWS TranscribeMicrosoft MAI-Transcribe
    Languages
    104
    Latency
    3s
    Speech recognition docs
  2. 02

    AI Context

    Give the AI the briefing a captioner would get: scripts, slides, agendas, and names. The AI Context Builder turns it into a description, names, and specialised language, which feed the proofreader and give speech engines a dictionary of words to expect.

    EnginesOpenAIAnthropic
    AI Context docs
  3. 03

    AI Proofreader

    A language model checks every caption line against that context, fixing names, brands, punctuation, and filler words, and it can finish before the audience sees a word. It works on captions from people and machines alike.

    EnginesOpenAIAnthropic
    Latency
    <1s
    How the AI Proofreader worksAI Proofreader docs
  4. 04

    AI translation

    Every caption line is translated live into as many languages as you need, with the engine chosen per language and custom dictionaries for brand names and terms.

    EnginesDeepLGoogleAzureOpenAI
    Languages
    93
    AI translation docs
  5. 05

    AI dubbing

    Speech-to-speech interpretation: the voice is carried straight into another language's audio track, without a round trip through text, for audiences who would rather listen than read.

    EnginesGemini Live Translate
    Languages
    75
    Latency
    10s
    How AI dubbing worksAI dubbing docs
  6. 06

    AI call agent

    A bot joins your Zoom call and transcribes it live, translating as it goes. Audio is used in the moment and never stored. Microsoft Teams and Google Meet are in development.

    EnginesRuns on the speech recognition engines above.
    AI call agent docs

People stay in control

AI is a set of tools in the workflow, not a replacement for the people who run it.

Human captioners, at no cost

Bring your own captioners, respeakers, or Velotype writers; delivering their captions is free.

Pricing

Context you can edit live

Change names and terms during the event; the proofreader uses them from the next line.

AI Context docs

Your data

Client content processed through Line 21 is not used to train any third-party AI model.

Used to train AI models?
No, for any vendor in the pipeline.
Exclude specific vendors?
Yes, per client engagement.
EU data residency?
Yes, depending on the speech and translation providers chosen.
Zero data retention?
Available for the language model providers.
Recordings kept?
30 days by default, shorter on request.
Data handling and retention

Put AI to work at your event

Tell us about your event and we'll help you choose the right mix of people and AI.

Talk to us