Line 21
CommunicationPaid
Comprehensive real-time captioning solutions for all your accessibility needs.
Last updated May 22, 2026
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What is Line 21?
Line 21's Top Features
Key capabilities that make Line 21 stand out.
Human and AI-powered captioning
Live support during events
AI Proofreader for context-aware error correction
AI Translations in 120 languages
Automatic Speech Recognition with high accuracy
Global network of professional captioners
Low latency video caption encoding
Transcripts available in multiple formats
Technical support for setup and integration
Accessibility in over 100 languages
Use Cases
Who benefits most from this tool.
Event Organizers
Ensure accessibility for all audience members by providing real-time captions during live events.
Educational Institutions
Facilitate inclusive learning by offering real-time, multilingual captions for virtual and in-person classes.
Broadcast Networks
Deliver accurate and timely captions for live broadcasts, including news and sports events.
Corporations
Enhance corporate communication with real-time captions during meetings and conferences, ensuring inclusivity and compliance.
Captioning Agencies
Leverage advanced AI and human captioning for a variety of client needs, across different languages and specializations.
Deaf or Hard of Hearing Individuals
Access real-time captions for better engagement in live events, educational settings, and workplace meetings.
Government Programs
Support accessibility initiatives such as the UK's Access to Work scheme with reliable real-time captioning.
Technical Teams
Receive dedicated support and consultation for setting up and managing captioning integrations and deliveries.
Concert Organizers
Provide captions for lyrics and dialogues, making performances accessible to all attendees.
Students
Benefit from electronic notetaking for a condensed version of lectures, enhancing study and review sessions.
Tags
captionsaccessibilityAI captioninghuman captioninglive captioningproofreadingtranslationsautomatic speech recognitiontechnical supportlive eventseducationcorporate usebroadcastingnotetakinggovernment schemes
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Frequently Asked Questions
What types of captioning services do you offer?
We offer both human and AI-powered captioning solutions, including live captioning, automatic speech recognition, and AI proofreading.
How accurate are your live captions?
Our live captions are produced by accredited stenographers and respeakers, offering high accuracy and typically reaching speeds of up to 300 words per minute.
Can you provide captions in different languages?
Yes, we support captions, translations, and proofreading in over 100 languages thanks to our global network of professional captioners and advanced AI models.
What technical support do you offer?
We provide dedicated technical support, including live event support, caption encoding, and assistance with setup and integration across multiple platforms.
How does your AI Proofreader work?
The AI Proofreader safeguards against typos and name errors using context-aware AI. It can be fine-tuned with context-specific glossary and terms.
What is the cost of your AI services?
AI Proofreading costs $1 per minute, AI Translations cost $0.15 per minute, and Automatic Speech Recognition (ASR) costs $0.25 per minute.
How do I download transcripts after a session?
All captioner transcripts are available to download in multiple formats (TXT, SRT, VTT) immediately at the end of your session.
Can you provide services for specific industries or specialized terminology?
Yes, we can. Our network includes specialists in various fields, ensuring accurate captions even for tricky terminology or specific industry jargon.
Do you offer services for in-person events?
Yes, we support both virtual and in-person events. You will need an internet connection to use our services even for in-person events.
How does your billing system work?
We offer a basic pay-as-you-go plan, and you pay for minutes used at the end of each month. There are also bundles available for upfront purchase with potential discounts.