# Vowel Practice vs NTRIP STX

The clearest difference is price: NTRIP STX at Free against Vowel Practice's $7.99. NTRIP STX also leads on iOS requirement (15.0 vs 26.0). Vowel Practice's advantage is in-app purchases (none vs 2) and update cadence (every 4 months vs every 10 months). On ads and device support there is nothing between them.

NTRIP STX is free to download; Vowel Practice costs $7.99 up front. NTRIP STX sells 2 in-app purchases, starting at $4.49 per month. Vowel Practice asks for nothing beyond the download.

Vowel Practice ships an update every 4 months, NTRIP STX every 10 months. The most recent releases landed on October 10, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Vowel Practice | NTRIP STX |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 10 months |
| Monetization | Paid | — |
| Size | 1 MB | 109 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [William Entriken](https://appshunter.io/developer/558586671) | [ITS Geo Solutions GmbH](https://appshunter.io/developer/1362963860) |

## What reviewers say

### Vowel Practice

[App page](https://appshunter.io/ios/app/vowel-practice/id799183655)

Analyze spoken vowels by calculating and plotting their formant frequencies. Speak a word with a single vowel to see its graphical representation on a standard vowel diagram, with an indicator light showing the application's status. Useful for speech therapy, language learning, and research.

**Highlights:** Calculates formant frequencies, Plots vowel locations on a diagram, Analyzes spoken vowels, Indicator light for status, Assists speech therapy, Supports language learning

**Features:** Vision Pro support

**In-app purchases:** none


### NTRIP STX

[App page](https://appshunter.io/ios/app/ntrip-stx/id1606816934)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Professional - Monthly | $4.49 | per month |
| Professional - Annual | $46.99 | per year |


## Frequently asked questions

### Is Vowel Practice free?

Vowel Practice costs $7.99, with no in-app purchases.

### Is NTRIP STX free?

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

### Do Vowel Practice or NTRIP STX have ads?

Neither Vowel Practice nor NTRIP STX shows ads.

### Which is updated more often, Vowel Practice or NTRIP STX?

Vowel Practice ships an update every 4 months, and NTRIP STX every 10 months. Most recently, Vowel Practice was updated on October 10, 2026 and NTRIP STX on October 4, 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.*