QuestroInterframe Pte. Ltd.
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Related Products
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About
Line 21 provides AI-powered live captions and subtitles, ensuring seamless accessibility for live events, streaming platforms, and digital content. Our hybrid approach combines AI automation with human expertise, delivering high-accuracy captions that adapt to industry-specific terminology, accents, and niche references. By leveraging our AI Proofreader, we enhance real-time captions, reducing errors and making live experiences more inclusive and engaging.
Our solution is designed for event organizers, broadcasters, and language service providers who need scalable, cost-effective, and high-quality captions. Traditional human captioning is expensive and non-scalable, while ASR solutions often lack accuracy. Line 21 bridges this gap by offering real-time AI-enhanced captions that integrate seamlessly into event tech and streaming workflows.
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About
Questro is a browser-based live event toolkit for the screens and controls a team runs on event day. One workspace holds four tools: a stage timer, moderated audience Q&A, a teleprompter, and AI live captions with real-time translation. Nothing to install — every tool runs in a modern browser on a laptop, tablet, phone, TV or venue screen.
Q&A. Attendees send questions from their phones via link or QR code — no app, no account. Moderators approve or reject, pin the active question, mark answered, and let the audience upvote. Only approved questions appear on the public display.
AI Captions. Turns speech into live captions with a translated line under the source text. Listens in 18 source languages (nine fully supported, nine in Beta) and translates into 69 target languages. Captions show on the venue screen and on attendees' phones. Strong fit for Chinese–English bilingual events.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
Users that need an AI-powered live captioning and subtitling tool
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Audience
Event organizers, event producers, AV teams, moderators, speakers, internal comms teams, conference organizers, educators
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Not Supported
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Screenshots and Videos |
Screenshots and Videos |
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Pricing
$0.09/min
Pay as you go
Free Version
Not Supported
Free Trial
Not Supported
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Pricing
$19/month
Free plan available. Pro: $19/month.
Free Version
Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationLine 21
Founded: 2023
United Kingdom
line-21.com
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Company InformationInterframe Pte. Ltd.
Singapore
questro.live
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Alternatives |
Alternatives |
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Categories |
Categories |
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Speech Recognition Features
Audio Capture
Supported
Automatic Form Fill
Supported
Automatic Transcription
Supported
Call Analysis
Supported
Concatenated Speech
Supported
Continuous Speech
Supported
Customizable Macros
Supported
Multi-Languages
Supported
Specialty Vocabularies
Supported
Speech-to-Text Analysis
Supported
Variable Frequency
Supported
Voice Recognition
Not Supported
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Integrations
Deepgram
Supported
Facebook
Supported
Microsoft Teams
Supported
OpenAI
Supported
Twitch
Supported
Videolinq
Supported
YouTube
Supported
Zoom
Supported
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Integrations
Deepgram
Not Supported
Facebook
Not Supported
Microsoft Teams
Not Supported
OpenAI
Not Supported
Twitch
Not Supported
Videolinq
Not Supported
YouTube
Not Supported
Zoom
Not Supported
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