About Line 21
Line 21 provides AI-assisted multilingual captions and translations for live events and videos. It helps content creators and event organizers reach global audiences with real-time subtitle generation.
Built for live streaming and video production workflows, Line 21 leverages speech recognition and machine translation to deliver accurate multilingual output.
Platforms
WebAPI
Best For
CreatorsTeams
Categories
Video AIProductivity AI
Capabilities & Features
Free Tier
API Access
Customizable
Multimodal
Voice Input
Video Input
Audio Output
File Upload
Collaboration
Not Available
No Signup Required
Open Source
Works Offline
Image Input
Image Output
Video Output
Web Search
Code Execution
Plugins
Memory
White Label
Self-Hostable
Browser Extension
Ideal Use Cases
video generationcontent creation
Pros & Cons
Real-time multilingual captions
Easy integration for live events
Accurate translations
Limited free tier languages
Requires stable internet