Line 21 Live Captions
Line 21 combines manual captioners and ASR with features like RTMP/HLS support, AI translations and an embeddable player. Pay-as-you-go pricing from $0.04/min.
line-21.com
Line 21 Live Captions — hybrid human + AI captioning
Line 21 provides AI-powered live captions and subtitles, ensuring seamless accessibility for live events, streaming platforms, and digital content.
Key Topics
Project Review
FAQ 3Intro
Line 21 Live Captions is a live captions platform that combines human captioners and AI capabilities. Public pages list both manual captioning and automated speech recognition (ASR) as available options, and the product includes tools intended to support live streams and post-production workflows. The company publishes a privacy policy that states privacy and data security are a top priority. Pricing information on the public site indicates pay-as-you-go billing with rates advertised from $0.04 per minute and an example rate shown as "Caption Minutes $3 / hour."
Key Features
- Manual Captioning: human captioners for live or recorded content.
- ASR (automatic speech recognition): automated caption generation.
- RTMP streaming support: integration point for live video feeds.
- HLS streaming support: playback-oriented streaming support.
- AI Translations: machine translation of captions.
- AI Proofreader: automated proofreading of generated captions.
- AI Context Builder: tools to provide contextual signals or metadata to the captioning process.
- Embeddable player: a player component to present captions with video.
Who this is for
Line 21 is positioned for clients who require captions for events and for agencies that want to use the technology with their own clients. The public pricing model is pay-as-you-go with no subscription plans listed, which is explicitly stated on the pricing page. Available documentation and pages do not list explicit caption accuracy metrics, a complete language matrix, service-level agreements, detailed API documentation, manual caption turnaround times, billing currency options, or customer case studies, so prospective buyers should request those details directly if they need them before procurement.
Frequently Asked Questions
What pricing options are available?
Public pricing is pay-as-you-go with rates advertised from $0.04 per minute. The pricing page notes there are no subscription plans and shows an example rate of "Caption Minutes $3 / hour."
Does the service use humans, AI, or both?
Public product information lists both manual captioning (human captioners) and ASR, indicating a hybrid approach that combines humans and AI for captioning.
How does Line 21 handle privacy?
The published privacy policy states that privacy and data security are a top priority and describes a commitment to transparent handling of user information.
Editorial Notice
This is an independent third-party profile of Line 21 Live Captions and is not officially affiliated with the project.
This review is based on publicly available website information and may contain errors or outdated details. Please verify critical details on the official website.
Outbound links may include a referral parameter for attribution.
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