# Subai vs Rootbly

The clearest difference is in-app purchases: Rootbly at none against Subai's 1. Rootbly also leads on ads (none vs shown). Subai's advantage is ratings volume (4 vs 1) and iOS requirement (13.0 vs 16.4). On price, rating, update cadence and device support there is nothing between them.

Both are free to download. Subai sells 1 one-off in-app purchase. Rootbly asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.0 for Subai against 4.0 for Rootbly. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Subai | Rootbly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/subai/id6503164347/reviews) | [4.0 (1 ratings)](https://appshunter.io/ios/app/rootbly-ai-subtitle/id6761355562/reviews) |
| Number of ratings | **4** | 1 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 175 MB | 41 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [dong huu quan](https://appshunter.io/developer/1277750787) | [Byeongsu KIM](https://appshunter.io/developer/1827219380) |

## What reviewers say

### Subai

[App page](https://appshunter.io/ios/app/subai/id6503164347)

Break language barriers with an AI-powered tool that translates videos and audio into over 100 languages. Upload files, record your voice, or paste video links for quick, accurate translations. Ideal for creators and global communicators.

**Highlights:** AI-powered video and audio translation, Supports over 100 languages, Upload video/audio files, Voice recording for translation, Website video link translation, Intuitive user interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic | $4.99 | one-time |


### Rootbly

[App page](https://appshunter.io/ios/app/rootbly-ai-subtitle/id6761355562)

Watch foreign YouTube videos with AI-generated translated subtitles in real-time. Paste a URL to get instant subtitles in your preferred language, with options to adjust sync, size, and view original text.

**Highlights:** AI subtitle translation, 15 languages supported, Real-time subtitle display, Subtitle sync adjustment, Customizable subtitle size, YouTube search and browsing, Job progress tracking

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Subai free?

Subai is free to download, with in-app purchases available.

### Is Rootbly free?

Rootbly is free to download, with no in-app purchases.

### Which has better reviews, Subai or Rootbly?

Subai and Rootbly are both rated 4.0 out of 5 on the App Store, from 4 and 1 ratings respectively.

### Do Subai or Rootbly have ads?

Subai shows ads; Rootbly does not.

### Which is updated more often, Subai or Rootbly?

Subai ships an update fortnightly, and Rootbly fortnightly. Most recently, Subai was updated on October 10, 2026 and Rootbly on October 14, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*