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About

Line 21 provides AI-powered live captions and subtitles, ensuring seamless accessibility for live events, streaming platforms, and digital content. Our hybrid approach combines AI automation with human expertise, delivering high-accuracy captions that adapt to industry-specific terminology, accents, and niche references. By leveraging our AI Proofreader, we enhance real-time captions, reducing errors and making live experiences more inclusive and engaging. Our solution is designed for event organizers, broadcasters, and language service providers who need scalable, cost-effective, and high-quality captions. Traditional human captioning is expensive and non-scalable, while ASR solutions often lack accuracy. Line 21 bridges this gap by offering real-time AI-enhanced captions that integrate seamlessly into event tech and streaming workflows.

About

Simply upload subtitle and video files to automatically match text to video content. Upload video and raw transcript file without timeline information. Timestamps will be automatically added to the transcriptions. Edit it online, then download subtitle files or video with subtitles directly. Original video language supports English, Spanish, Simplified Chinese, Traditional Chinese, Cantonese, Japanese, Korean, French, Thai, Russian, Portuguese, German, Italian, Vietnamese, Arabic. Single line word limit means the maximum number of words in a line of subtitles. When a paragraph contains many words, the system will make reasonable cuts according to the single line word limit to ensure that the number of words in a line of subtitles does not exceed the limit, therefore improving the subtitle display and facilitating reading.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Users that need an AI-powered live captioning and subtitling tool

Audience

Anyone looking for a fast AI Captioning solution

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$0.09/min
Pay as you go
Free Version Not Supported
Free Trial Not Supported

Pricing

$7.99 per hour
Free Version Not Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Line 21
Founded: 2023
United Kingdom
line-21.com

Company Information

Zeemo AI
United States
zeemo.ai/

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EoleCC

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CapMate

CapMate

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CapMate

CapMate

Venera Technologies
Subanana

Subanana

Datax Limited

Categories

Closed Captioning Supported
Speech Recognition Supported
Speech to Text Supported
Subtitle Supported

Categories

Closed Captioning Supported
Subtitle Supported

Speech Recognition Features

Audio Capture Supported
Automatic Form Fill Supported
Automatic Transcription Supported
Call Analysis Supported
Concatenated Speech Supported
Continuous Speech Supported
Customizable Macros Supported
Multi-Languages Supported
Specialty Vocabularies Supported
Speech-to-Text Analysis Supported
Variable Frequency Supported
Voice Recognition Not Supported

Integrations

Deepgram Supported
Facebook Supported
Microsoft Teams Supported
OpenAI Supported
Twitch Supported
Videolinq Supported
YouTube Supported
Zoom Supported

Integrations

Deepgram Not Supported
Facebook Not Supported
Microsoft Teams Not Supported
OpenAI Not Supported
Twitch Not Supported
Videolinq Not Supported
YouTube Not Supported
Zoom Not Supported
Claim Line 21 and update features and information
Claim Line 21 and update features and information
Claim Zeemo AI and update features and information
Claim Zeemo AI and update features and information