Line 21 – AI Tool for Video

Ai-assisted Multilingual captions & translations for live events and videos.

Categories: Video, Transcription, Translation

Rating:Not Yet Rated

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Pricing:From $0.04/mo

₹3₹4 incl. 18% GST

TL;DR — Line 21

Ai-assisted Multilingual captions & translations for live events and videos. Pricing starts from ₹3/mo. Security: Published posture.

What is Line 21?

Line 21 is an AI-supported software designed to facilitate the creation, enhancement, translation, and delivery of live captions. The tool is uniquely designed to merge the capabilities of human captioners with AI's proof-reading ability, promoting an inclusive environment for all users and producing a higher standard of live content. Users can easily send captions through Line 21, either by using a keyboard macro or via a connector. The AI Proofreader feature of Line 21 detects and rectifies any errors in the captions in real time and can be calibrated according to the demands of each individual client. The software provides automated translation of captions into over 100 languages using custom AI engines for each language. To ensure that their clients receive captions without any significant delay, Line 21 ensures low latency delivery to all destinations. This is facilitated through a variety of means, including browser link, subtitle overlay, video encoding, or API integration. One of the fascinating features of Line 21 is its ability to distribute customized captions to a wide range of destinations from social media platforms to custom web link and overlay apps. Despite its extensive capabilities, the tool remains user-friendly and interactive, integrating with a wide range of services and delivering captions to a variety of destinations.

Security Assessment

Security: Published posture

Published posture scored 12/20 or above. We check HTTPS, a reachable privacy policy, and stated compliance commitments. We do not perform security testing.

Last assessed: 21 August 2026

How this score was built

Each scored criterion links to the published page it was derived from. Unscored criteria are marked, not guessed. This listing has not been hands-on tested.

Security & Data Privacy
The privacy policy outlines data collection, usage, and retention practices, indicating a commitment to user data security.
Source: line-21.com
8/10
Functionality & Features
The homepage lists various services and features offered by Line 21.
Source: line-21.com
7/10
Ease of Use
Requires hands-on use of the product.
Not assessed
Pricing & Value
The pricing page provides a pay-as-you-go model, indicating flexibility in pricing.
Source: line-21.com
6/10
Reliability & Performance
Requires hands-on use of the product.
Not assessed
Integration Capabilities
No citable published evidence in this pass.
Not assessed
Customer Support
No citable published evidence in this pass.
Not assessed
Company Stability
No citable published evidence in this pass.
Not assessed
Update Frequency
No citable published evidence in this pass.
Not assessed
Startup-Friendliness
The pricing model suggests some level of startup-friendliness with a pay-as-you-go option.
Source: line-21.com
5/10

Frequently Asked Questions

What is Line 21 and what does it do?

Ai-assisted Multilingual captions & translations for live events and videos.

What does Line 21 cost in India?

Line 21 starts at ₹3/month (plus 18% GST).

Is Line 21 safe for startups?

Line 21 has a published security posture scoring 12/20 or above (HTTPS, a reachable privacy policy, and/or stated compliance commitments). We do not perform security testing.