What is Line 21?
Line 21 streamlines live caption creation and delivery, offering translation, enhancement, and seamless distribution across platforms.
Key Features:
- ASR and AI Proofreader: Automatic Speech Recognition and AI-driven proofreading ensure superior accuracy and real-time error prevention.
- Multi-Language Support: Supports over 100 languages for captions, translations, and proofreading.
- Universal Distribution: Delivers captions to diverse endpoints, including popular platforms like YouTube, Facebook, Zoom, and custom RTMP streams.
Use Cases:
- Easily integrate live captions into online broadcasts, webinars, and virtual conferences.
- Provide real-time translations for multilingual audiences in live events and lectures.
- Enhance the accessibility of video content by adding captions for hearing-impaired viewers.
Conclusion:
Line 21 empowers users with an all-in-one captioning solution that seamlessly integrates human expertise and AI technology, ensuring accurate, fast, and accessible live captions for a global audience.
More information on Line 21
Launched
2023-03
Pricing Model
Paid
Starting Price
£0.05 / min
Global Rank
12372928
Follow
Month Visit
<5k
Tech used
Next.js,Vercel,Emotion,Webpack,HSTS
Top 5 Countries
65.18%
27.84%
6.98%
United Kingdom
United States
Spain
Traffic Sources
52.28%
38.64%
5.75%
2.64%
0.48%
0.08%
Search
Direct
Referrals
Social
Paid Referrals
Mail
Source: Similarweb (Sep 24, 2025)
Line 21 was manually vetted by our editorial team and was first featured on 2023-07-08.
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