# Build SRT vs Caption AI

The clearest difference is price: Caption AI at Free against Build SRT's $2.99. Build SRT's advantage is in-app purchases (none vs 4) and device support (3 vs 1). On update cadence, ads and iOS requirement there is nothing between them.

Caption AI is free to download; Build SRT costs $2.99 up front. Caption AI sells 4 in-app purchases, starting at $2.99 per 7 days. Build SRT asks for nothing beyond the download.

Build SRT ships an update every 5 weeks, Caption AI monthly. The most recent releases landed on August 14, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Build SRT | Caption AI |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/build-srt/id6504424008/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Paid | — |
| Size | 25 MB | 48 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [韩 明洁](https://appshunter.io/developer/399378149) | [Beijing Xingnian Trading Department (Individually Owned Business)](https://appshunter.io/developer/1556019310) |

## What reviewers say

### Build SRT

[App page](https://appshunter.io/ios/app/build-srt/id6504424008)

This utility converts spoken audio from videos into standard SRT subtitle files. It supports importing videos from your device and offers efficient sound extraction for subtitle generation. The generated SRT files are universally compatible and easily shareable.

**Highlights:** Speech-to-text transcription, Import videos from Photos and Files, Extract audio for SRT generation, Universal SRT file format, Share SRT files easily

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Build SRT free?

Build SRT costs $2.99, with no in-app purchases.

### Is Caption AI free?

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

### Do Build SRT or Caption AI have ads?

Neither Build SRT nor Caption AI shows ads.

### Which is updated more often, Build SRT or Caption AI?

Build SRT ships an update every 5 weeks, and Caption AI monthly. Most recently, Build SRT was updated on August 14, 2026 and Caption AI on September 26, 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.*