Pay as you go pricing. Or build a plan.

You only pay for minutes when you provide your own human captioners. Otherwise it's free.

• Caption View Page
• Overlay App
• Download as Transcripts
• Download as Subtitles

We work with a large network of professional captioners and captioning agencies to cover a wide variety of languages and timezones.

• High-Accuracy Certified Professional Writers
• Wide Language Coverage
• On-site or Remote

Safeguard your captions against typos and name-errors using a context-aware Ai.

• State-of-the-art LLMs
• Build custom event context
• Tweak in real-time

Translate captions automatically in 120 languages using high-performance language models.

• State-of-the-art translations engines
• Custom dictionaries
• Over 120 languages supported

Use speech-to-text models to automatically create captions with up to 97% accuracy.

• State-of-the-art STT Models
• High Accuracy
• Custom Dictionaries
• Direct Audio or RTMP Stream Ingest

• CEA 608/708 Encoding
• SRT / RTMP Ingest
• Simulcast: YouTube Live, Facebook Live, Twitch, Vimeo
• Custom RTMP Destination

HLS caption encoding. Go directly to end users by providing an embeddable player that allows for all caption languages to be displayed.

• HLS Streaming
• 1080p Video Quality
• SRT / RTMP Ingestion
• Multi-language Captions
• Multi-language Audio Tracks (coming soon)
• Embeddable Player
• Hosted Video Player Page
• Global CDN

Add live spoken-language interpretation alongside your captions and translations.

• Live Interpretation
• Multi-language Support

Make Multi-language meetings more accessible with real-time captions and translations.

• Speech-to-text
• Translations
• Multi-language Support
• Diarization
• Dedicated Meeting Page

Use Line 21 to power full-time schedule of mixed pre-recorded and live events for accessible venues.

• Caption playback
• ASR for Live Events
• Schedule Mixed Playlists
• Shareable Links & QR Codes

A support engineer on standby for your live event, 09:00 - 18:00 UK time.

A support engineer on standby for your live event, 06:00 - 09:00 and 18:00 - 23:00 UK time.

A support engineer on standby for your live event, nights and weekends.