Line 21 is a UK-based live captioning service that provides both human and AI-powered captioning for live events. It supports over 100 languages and integrates with major streaming platforms such as YouTube, Twitch, Facebook, Vimeo, and conferencing tools like Zoom and Microsoft Teams. Key features include automatic speech recognition (ASR), real-time AI proofreading, AI translations, and support for RTMP and HLS streaming. The platform is designed for events ranging from keynotes and festivals to corporate meetings and webinars, offering flexible output options including embedded players, CEA 608/708 captions, and custom overlays.
Key Benefits
- Supports both human and AI captioning
- AI Proofreader for real-time corrections
- 100+ languages supported
- Integrates with major streaming platforms