# Caption AI vs SubAI

The clearest difference is update cadence: SubAI at every 5 days against Caption AI's monthly. Caption AI's advantage is iOS requirement (16.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Caption AI sells 4 in-app purchases, starting at $2.99 per 7 days and SubAI sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Caption AI ships an update monthly, SubAI every 5 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Caption AI | SubAI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/subai-video-subtitle-helper/id6771306934/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | — | Freemium |
| Size | 48 MB | 152 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Xingnian Trading Department (Individually Owned Business)](https://appshunter.io/developer/1556019310) | [琦 马](https://appshunter.io/developer/1543007311) |

## What reviewers say

### Caption AI

[App page](https://appshunter.io/ios/app/caption-ai-subtitle-maker/id6760328167)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Monthly | $3.99 | per month |
| Annual | $14.99 | per year |
| Lifetime | $59.99 | one-time |


### SubAI

[App page](https://appshunter.io/ios/app/subai-video-subtitle-helper/id6771306934)

Easily generate bilingual subtitles for local videos in seconds. This tool makes foreign language content, online courses, and tutorials more accessible by transcribing speech and embedding subtitles directly into your videos. All processing is done on-device for enhanced privacy.

**Highlights:** AI subtitle generation, Bilingual subtitle support, Burned-in subtitle recognition, Fast subtitle embedding, SRT, VTT, TXT export, 100% local processing

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SubAI Pro Monthly | $3.99 | per month |
| SubAI Pro Yearly | $14.99 | per year |
| SubAI Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Caption AI free?

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

### Is SubAI free?

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

### Do Caption AI or SubAI have ads?

Neither Caption AI nor SubAI shows ads.

### Which is updated more often, Caption AI or SubAI?

Caption AI ships an update monthly, and SubAI every 5 days. Most recently, Caption AI was updated on October 31, 2026 and SubAI on October 31, 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.*