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Rootbly - AI Subtitle

Rootbly - AI Subtitle

YouTube Video Translator

2 ratings
1 review
📚 Education
🔧 Utilities
Free
In-App Purchases

Details

Released
April 9, 2026
Updated
November 11, 2026

Features

Developer

Byeongsu KIM
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About

Watch foreign YouTube videos with AI-generated translated subtitles in real-time. The app supports 15 languages and offers a built-in player with subtitle sync and size controls. Easily find and manage videos directly within the application.

✓AI subtitle translation
✓Built-in video player
✓Subtitle sync control
✓Subtitle size settings
✓YouTube search and browsing
✓Clipboard URL detection
✓Real-time job progress tracking
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What's New in Rootbly

3.4.0

November 11, 2026

• Choosing languages is easier — tap FROM or TO to open the language list straight away • The detected source language now shows by name instead of a code (e.g. Slovak, Cantonese) • Long language names no longer get cut off with larger text sizes • We've opened a Discord community — join from Settings › News & help and share your feedback and ideas • Minor improvements and stability fixes

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Subscriptions & In-App Purchases

RootblySub Pro

Unlimited daily subtitles, 3-hour videos, SRT export

$5.991 Month
1 Month trial
How to cancel Rootbly subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Very bad and it plays on the nerves

Video does not work and translation is inaccurate
JFJack fadin

Response from developer

Hi Jack, We're sorry to hear about your experience with RootblySub. We understand how frustrating it can be when videos don't play properly or translations are inaccurate. We're continuously working to improve video playback and translation quality. If possible, please share the video URL and details of the issue so we can investigate further. Thank you for your feedback. It helps us make RootblySub better.

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FAQ

What languages does Rootbly support for subtitle translation?

Rootbly supports AI subtitle translation for 15 languages, including English, Korean, Japanese, Chinese, Spanish, and French. This allows users to access a wide range of global YouTube content.

Can I adjust the translated subtitles in Rootbly?

Yes, Rootbly offers subtitle sync control, allowing manual offset adjustment within ±5 seconds. You can also customize subtitle size with presets and fine-grained control.

Does Rootbly have ads?

Rootbly does not contain advertisements. It also integrates with YouTube Premium for an ad-free viewing experience within the app.

What devices is Rootbly available on?

Rootbly is available on iPhone and iPad devices. The app is designed for mobile and tablet use.

How often is Rootbly updated?

The latest version of Rootbly was released on 2026-11-08, indicating regular updates from the developer. This ensures the app remains functional and receives new features.

What is the pricing for Rootbly?

Rootbly is free to download and use. A premium subscription, RootblySub Pro, is available for $5.99 per month, which includes a one-month free trial.

Can I find YouTube videos directly within Rootbly?

Yes, Rootbly includes a YouTube search function and a channel browser, allowing you to find videos, Shorts, playlists, and live streams directly within the app without leaving it.

What is the age rating for Rootbly?

Rootbly has an age rating of 4+, making it suitable for a wide range of users. The app's content and functionality are appropriate for children and adults.