Vowel Practice vs NTRIP STX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Vowel Practice
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.
- Calculates formant frequencies
- Plots vowel locations on a diagram
- Analyzes spoken vowels
- Indicator light for status
- Assists speech therapy
- Supports language learning
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This application calculates and plots the formant frequencies of spoken vowels. The user should speak a word containing a single vowel, and we will analyze and show results. First two formant frequencies are used to graphically show the location of spoken vowel on a standard vowel diagram. An indicator light changes its color to display the status of the application. This is made to assist with speech therapy and language learning as well as other research topics.
NTRIP STX
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NTRIP STX is a Ntrip client, capable of delivering RTK corrections to connected Stonex GNSS receivers to provide centimeter accuracy. You can then connect other mapping and surveying apps to these receivers for precise data collection and stakeout. NTRIP STX includes a world-wide database of available Ntrip casters. Free subscription: - Run the Ntrip connection for 10 minutes per day - Free 7 days trial of all “Professional" subscription features Paid "Professional" subscription: - no time limits on connection to Ntrip caster Purchase of a NTRIP STX subscription allows you to run the NTRIP STX App on all supported platforms. Subscription payments will be charged to your iTunes Account at confirmation of purchase and will automatically renew unless you cancel your subscription or turn off auto-renewal at least 24-hours prior to the end of the current subscription period. A cancelled subscription remains active until the end of the current period, at which time your account reverts to the “Free" subscription functionality. Customers selecting the Free Trial will enjoy “Professional" subscription features for a period of 7 days, after which they can elect to purchase a paid subscription. In the absence of a purchase, their account will revert to “Free" subscription functionality. For further information: • NTRIP STX Privacy Policy: https://its-geo.eu/Privacy.html • NTRIP STX Terms of Use: https://its-geo.eu/terms-of-service.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Vowel Practice | NTRIP STX |
|---|---|---|
| Price | $7.99 | Free — better |
| Positive reviews | 20.0% of reviews | — |
| Update frequency | Every 4 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 109 MB |
| Age rating | 4+ | 4+ |
| Developer | William Entriken | ITS Geo Solutions GmbH |
In-app purchases
Vowel Practice
No in-app purchases
NTRIP STX
- Professional - Monthly$4.491 Month
- Professional - Annual$46.991 Year









