Line 21

Line 21 provides live captioning services designed for integration with live events, online streaming, in-venue presentations, and broadcast scenarios. The platform supports both manual captioning and automatic speech recognition (ASR), aiming to deliver accurate closed captions by combining human and AI capabilities. It addresses the need for accessible and multilingual communication during live content delivery.

Among its features, Line 21 offers AI-powered translations, an AI proofreader, and an AI context builder to enhance caption accuracy and relevance. The service includes an embeddable player, a meeting bot, and supports caption encoding in CEA 608/708 formats. Users can utilize playlists, caption playback, a caption view page, and overlays to manage and display captions. The platform also provides an API for further customization and integration.

Line 21 integrates with a range of popular streaming and communication services, including YouTube, Twitch, Facebook, Vimeo, custom RTMP streams, Microsoft Teams, Microsoft Skycap, Zoom, as well as AI and cloud platforms such as ChatGPT, Claude, and AWS. It supports captioning in over 100 languages and lists more than 15 integrations, indicating broad compatibility with various workflows and event types.

The service is positioned as a solution for organizations or individuals seeking to make live content more accessible through accurate and multilingual captioning. Details regarding pricing and licensing are referenced but not specified in the available information.