Line 21

Line 21 is a Translation & Localization tool that provides intelligent live captioning services. It integrates human captioners and AI for accurate, real-time captions and translations in over 100 languages.

Claim this tool

No Views Yet

At a glance

Pricing

Usage-based

Free tier

API

Yes

Skill level

Mixed

About

What is Line 21?

Line 21 offers a comprehensive and flexible solution for live captioning needs, combining human expertise with advanced AI. It supports both human captioning for high-stakes events and AI for speed and scale, with the option to mix them. Key features include an AI Proofreader that learns event context for real-time corrections, live translations in over 100 languages, and multi-destination output. The platform integrates seamlessly with various streaming platforms like YouTube, Twitch, Facebook, Vimeo, and custom RTMP, as well as meeting tools like Zoom and Microsoft Teams. Line 21 also provides services such as ASR (Automatic Speech Recognition), HLS streaming, and caption encoding (CEA 608/708), making it suitable for online streaming, in-venue events, and broadcast.

Best used for

Ideal for content creators and writers who need to provide accurate live captions for online streams, translate content in real-time for global audiences, and ensure error-free text for broadcast. Especially valuable for events, webinars, and meetings requiring accessibility and multi-language support.

Common actions

add live captions

translate live content

proofread captions

stream captions

AccessibilityAI captioninggovernment schemeslive captioningtechnical supportnotetakingtranslationsProofreadingcorporate uselive events+ 5 more

Capabilities

Key features

Live captioning
AI proofreading
Real-time translations
Multi-destination output
ASR speech recognition
Caption encoding
Embeddable player

Target Audience

content creatorwriter

Integrations

youtubetwitchfacebookvimeomicrosoft-teamszoomchatgptclaude+ 1 more

Pricing & Plans

Usage-based

Ai Proofreader

FAQs

What is the pricing model for Line 21's services?

Line 21 operates on a pay-as-you-go, usage-based model. General caption minutes start from $0.04/minute, with specific services like AI Proofreader ($21/hour), AI Translations ($9/hour), and ASR ($15/hour) priced separately. Human captioners are available from $120/hour.

Can Line 21 integrate with my existing streaming platforms and meeting tools?

Yes, Line 21 offers extensive integrations. It supports popular streaming platforms like YouTube, Twitch, Facebook, and Vimeo, as well as custom RTMP. For meetings, it integrates with Microsoft Teams and Zoom, ensuring broad compatibility for your live events.

How does Line 21 ensure the accuracy of its live captions?

Line 21 combines human captioners for high-stakes events with advanced AI models. It features an industry-first AI Proofreader that learns event context to deliver real-time corrections before captions are displayed, acting as a crucial last line of defense against errors.

Trending

Subcategories trending in Content & Design

Image Generation AI Writing Assistants Audio & Music Video Generation Photo Editing Graphic Design

Trending

Explore

Browse AI tools by category

Content & Design Productivity & Business Coding & Development AI Agents & Automation Research & Education Wellness & Lifestyle Career Development Marketing & Growth Data & Analytics Customer Support & CX Finance E-commerce