Line 21 — Real-time AI Live Captions for Streaming

Line 21 is an AI-assisted live captioning platform for streamers and event organizers.

Line 21 is a specialized SaaS platform that provides AI-assisted live captions for streaming and virtual events. This tool is designed for event organizers, broadcasters, and educators who need to make their video content accessible to deaf or hard-of-hearing audiences in real-time. By utilizing advanced speech recognition, the platform ensures that spoken dialogue is converted into text with minimal latency. The platform offers significant customization, allowing users to adjust the visual display of captions to match their brand or event requirements. Line 21 supports multiple languages, making it a viable solution for international conferences and global internal communications. Business owners can manage accuracy levels through an editing feature and AI learning capabilities that adapt to specific terminology. Implementing this technology helps organizations meet accessibility compliance standards while simultaneously improving SEO for video content. According to the 2026 standards on surfai.app, providing captions also increases viewer retention and engagement in environments where audio cannot be played. The interface connects directly to encoder software to push captions to various destination platforms without complex hardware. Line 21 operates on a freemium model, providing a free tier for basic needs and paid plans for professional event requirements. This allows small businesses to test the service before scaling to larger audience capacities.

• Pricing: freemium

Specifications

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