Sounds of Speech
by The University of Iowa Research Foundation
- Education
- Paid
- Zombie
- Small & simple · 96
- Rating
- 2.3
- 46 ratings · US storefront
- Top 97%among 92 Education apps
- Last update
- Aug 6, 2024
- Version 4.0.0
- Size
- 109 MB
- Category
- Education
- Tracked since
- Oct 10, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
Notice: This Contains English Only Content. Spanish and German not included.
This application was originally designed at the University of Iowa to help students learning how the sounds of different languages are produced. Since its production, it has become a milestone for phonetics teaching tools around the globe.
Sounds of Speech™ provides a comprehensive understanding of how, physiologically, each of the speech sounds of American English is formed. It includes animations, videos, and audio samples that describe the essential features of each of the consonants and vowels of American English. Sounds of Speech™ is especially useful for students studying English as a second language. Features include:
What’s new
Release notes for the latest version, as written by the developer.
Updates under the hood.
Rank history
Daily position in the Spain charts. #1 is at the top.
- Best rank
- #12
- Current rank
- #12
- Days charting
- 1 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
96/100
Small & simple
- Developer size100% · 25
Developer: 1 app on the charts
- Audience size100% · 20
Ratings: 46
- App size60% · 10
Size: 109 MB
- Price model100% · 15
Price model: paid
- Demand proof100% · 30
Best rank #3, 37 countries
An indicator, not a fact. We can't see team size. Calculated Oct 24, 2026 · method i2
How the score worksVersion history
- 4.0.0LatestReleased Aug 6, 2024