# Vowel Practice vs EMS PRO ONE

The clearest difference is price: EMS PRO ONE at Free against Vowel Practice's $7.99. EMS PRO ONE also leads on iOS requirement (12 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

EMS PRO ONE is free to download; Vowel Practice costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Vowel Practice ships an update every 4 months, EMS PRO ONE every 3 months. The most recent releases landed on October 10, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Vowel Practice | EMS PRO ONE |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Paid | — |
| Size | 1 MB | 24 MB |
| Requires iOS | 26.0 | **12** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [William Entriken](https://appshunter.io/developer/558586671) | [Markus Trocha](https://appshunter.io/developer/1770456913) |

## 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


### EMS PRO ONE

[App page](https://appshunter.io/ios/app/ems-pro-one/id6717588985)

**In-app purchases:** none


## Frequently asked questions

### Is Vowel Practice free?

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

### Is EMS PRO ONE free?

EMS PRO ONE is free to download, with no in-app purchases.

### Do Vowel Practice or EMS PRO ONE have ads?

Neither Vowel Practice nor EMS PRO ONE shows ads.

### Which is updated more often, Vowel Practice or EMS PRO ONE?

Vowel Practice ships an update every 4 months, and EMS PRO ONE every 3 months. Most recently, Vowel Practice was updated on October 10, 2026 and EMS PRO ONE 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.*