What is Line 21?
Line-21 is a professional live captioning solution for live events, YouTube streams, etc.Key innovation: an Ai Proofreader that checks captions before they are delivered.It provides multiple modes of operation such as Advisor, Assistant, and Approver, catering to different levels of user involvement.
Whether for live events or pre-written content, L21 AI Proofreader provides recommendations, live edits, or final checks to ensure the highest quality captions and textual accuracy.The tool respects context, adapts to content, and allows users full control over its behavior through different trust modes: Advisor, Assistant, Approver.
It provides two precision levels, optimized for speed or accuracy, ensuring flawless delivery of captions.Ai Proofreader learns from context, recognizes thematic elements, character names in scripts, or technical terms, making it adept at proofreading with a keen, context-aware eye.
Line 21 details
- Company
- L21 Limited
- Built for
- Businesses and teams
Line 21 tech specs
- Works with
- OpenAI / GPT Anthropic / Claude
- Integrations
- Discord
Line 21 pricing
FreemiumLine 21 offers a free plan with paid upgrades available.
Verify on the official pricing page.
View plansLine 21's key features
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Live events captions proofreading
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Contextual proofreading
Line 21 use cases
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Improving the quality of live event captions with real-time suggestions and edits
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Refining pre-written articles or reports with context-aware grammar and style checks
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Ensuring technical documents adhere to specific terminologies and factual consistencies
Line 21 user reviews
Based on 6 reviews, 100% of users recommend Line 21, rated highly for quality results.
Liked for
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Who is Line 21 for?
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Content creators
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Event organizers
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Writers
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Editors
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Proofreaders
Line 21 FAQ
Is Line 21 free?
Partly. Line 21 has a free plan with usage limits, and paid plans unlock the full feature set.
Is Line 21 safe to use?
Line 21 is operated by L21 Limited.
What are the best alternatives to Line 21?
The closest alternatives to Line 21 are WPS office, LanguageTool, AI Humanize, Text Enhancer AI and HumanizeAI. You can compare them side by side in the alternatives section further down this page.
What does Line 21 do with my data?
Line 21 states that customer content is not used to train its models. Its privacy policy states that personal data is not sold or shared for marketing purposes. Data may be shared with third-party service providers that help run the product.
Who made Line 21?
Line 21 is built and operated by L21 Limited.
Which AI models does Line 21 use?
Line 21 is built on OpenAI / GPT and Anthropic / Claude. Which models you can reach may depend on your plan.
What does Line 21 integrate with?
Line 21 connects with Discord.
Compliance, privacy and billing terms are as stated in each product's own published documentation and have not been independently verified by TopAI.tools.
