# Prometheus Mobile STO vs Live Caption AI

The clearest difference is in-app purchases: Prometheus Mobile STO at none against Live Caption AI's 14. Prometheus Mobile STO also leads on iOS requirement (13.0 vs 16.4). Live Caption AI's advantage is update cadence (every 9 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Live Caption AI sells 14 in-app purchases, starting at $0.99 per month. Prometheus Mobile STO asks for nothing beyond the download.

Prometheus Mobile STO ships an update every 2 months, Live Caption AI every 9 days. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Prometheus Mobile STO | Live Caption AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/live-caption-ai/id6476466216/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 48 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Prometheus Group, Inc](https://appshunter.io/developer/1554172551) | [Live Caption, Inc.](https://appshunter.io/developer/955278048) |

## What reviewers say

### Prometheus Mobile STO

[App page](https://appshunter.io/ios/app/prometheus-mobile-sto/id6452803445)

**Features:** macOS Compatibility

**In-app purchases:** none


### Live Caption AI

[App page](https://appshunter.io/ios/app/live-caption-ai/id6476466216)

This app converts spoken words into text in real-time, aiding content creators, students, and those with hearing impairments. It offers instant transcription, note-taking, and remote viewing of captions via web links.

**Highlights:** Instantaneous transcription, Accessibility for hearing impaired, Automated lecture transcription, Remote caption viewing via web links, Save and tag transcripts, Searchable spoken information

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

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1/4 Hour Monthly Subscription | $0.99 | per month |
| 1/2 Hour Monthly Subscription | $1.49 | per month |
| Unlimited, Personal Use | $3.99 | per month |
| 2 Hour Monthly Subscription | $4.99 | per month |
| Professional Monthly (Individual) | $19.99 | per month |
| 10 Hour Monthly Subscription | $24.99 | per month |
| 20 Hour Monthly Subscription | $39.99 | per month |
| Team Professional (Yearly) | $599.99 | per year |
| Extend My Trial | $0.99 | one-time |
| 1/4 Hour Public Weblink | $1.49 | one-time |
| Extend 2 Hours + Weblink | $1.99 | one-time |
| 1/2 Hour Public Weblink | $2.99 | one-time |
| 2 Hour Public Weblink | $9.99 | one-time |
| 10 Hour Public Weblink | $49.99 | one-time |


## Frequently asked questions

### Is Prometheus Mobile STO free?

Prometheus Mobile STO is free to download, with no in-app purchases.

### Is Live Caption AI free?

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

### Do Prometheus Mobile STO or Live Caption AI have ads?

Neither Prometheus Mobile STO nor Live Caption AI shows ads.

### Which is updated more often, Prometheus Mobile STO or Live Caption AI?

Prometheus Mobile STO ships an update every 2 months, and Live Caption AI every 9 days. Most recently, Prometheus Mobile STO was updated on October 19, 2026 and Live Caption AI on October 24, 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.*