Comparison

Vowels Central Diphthong vs Estill Exercises

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Vowels Central Diphthong

Features
Read full description

The Speech Articulation: Vowels Central/Diphthong app authored by Fred D. Minifie, Ph.D, provides valuable instructional/clinical tools for speech-language pathologists, otolaryngologists, speech scientists, linguists, teachers of singing and other professionals. The app includes five central and three diphthong vowel dynamic animations with sound plus a key view for each of the tongue shape and placement for the structural movements involved in the production of the vowels of American English. • Anatomy ID: as each part is touched, the part highlights and the part name and description text changes. Description text shows or hides on demand. Description text shows or hides on demand. - Anatomy view - 26 parts, includes nose, mouth and throat structure ID. Zoom and pans. • Highlight View: key view of the tongue shape and placement for five central and three diphthong vowels of American English. - Central: /a/, /Λ/, /ә/, /ɝ/, /ɚ/ Diphthong: /αυ/, /αɪ/, /כɪ/ • Animations: each vowel shows a lateral view of dynamic movements of the jaw, lips, tongue, velum (soft palate), and larynx needed for proper articulation of that vowel. Audio for each vowel sound is synchronized with the dynamic animations. Anatomy animation included. • Two finger pan of all animations and key animation pages. • Drawing Whiteboard feature: - Drawing: freeform lines in red, blue, green or black hue. Change size by tapping on size panel - Draw and text directly on active animation and video. - Text: Change size by tapping on size panel, auto wrap, non-movable in red, blue, green or black hue. - Eraser: touch and rub lines and text on whiteboard to erase. - Trash: one tap deletes all whiteboard lines and text. - Screenshot whiteboard direct to Photos App for easy email and printing. • iOS 6.0+ required, designed for iPad and iPhone. The Speech Articulation: Vowels Front/Back app makes learning otitis media ear disorders easy. See example screen shots below. Get the app today!

About

Estill Exercises

Master vocal techniques with guided exercises and expert instruction. Track your progress, review study materials in multiple languages, and connect with a community of learners. Perfect for both beginners and experienced users looking to refine their voice.

Highlights
  • Personalized user center with notes and bookmarks
  • Study materials in 6 languages
  • Expert-guided video lessons
  • Progress tracking and practice logging
  • Audio training exercises
  • Interactive flashcards for exam prep
  • Attractor state check-in
Features
Read full description

Estill Voice Training, the leader in voice training and rehabilitation across the globe, comes to the palm of your hand! Train your voice anytime and anywhere. Estill Exercise features: User Center: Take control of your learning journey with our brand new personalized user center featuring notes, bookmarks, and more! Review Estill Figures and Qualities: Our EVT study materials are now in 6 languages and with a fresh look. Train with Estill Experts: Master Estill Figures and Qualities with expert guidance from certified Estill trainers through engaging videos and targeted exercises. Practicebook: Keep track of your progress and log all your practice sessions with our convenient Practicebook feature. Audio Training Exercises: Turn your Figures into Artistry Action with weekly Audio Training Exercises. Compete & Connect: Level up your knowledge, earn badges, and connect with fellow learners. Estill Etudes Accompaniment: Need help with Estill Etudes? These fun melodies were created to accompany the melodic exercises in the book. Flash Cards: Ace your exam preparation with our interactive flashcards for targeted practice. Attractor State Check-in: Check-in with your voice before jumping into more challenging vocal exercises, or track your Attractor State on your audition day! Whether you’re new to Estill Voice Training® and want to start using our unique and powerful system for training your voice or have used Estill for decades and want a way to practice and keep your voice in shape, Estill Exercises helps you achieve your vocal goals! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Vowels Central Diphthong4 screens
Estill Exercises4 screens

Verdict

The call

The clearest difference is price: Estill Exercises at Free against Vowels Central Diphthong's $4.99. Estill Exercises also leads on update cadence (every 6 weeks vs every 37 months). Vowels Central Diphthong's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 14.0). 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

CostPrice · In-app purchases · Ads · Monetization

Estill Exercises is free to download; Vowels Central Diphthong costs $4.99 up front. Estill Exercises sells 1 in-app purchase, starting at $9.99 per month. Vowels Central Diphthong asks for nothing beyond the download.

UpkeepUpdate frequency

Vowels Central Diphthong ships an update every 37 months, Estill Exercises every 6 weeks. The most recent releases landed on October 23, 2026 and October 17, 2026 respectively.

Scorecard4 real differences · 6 level
Vowels Central Diphthong versus Estill Exercises: the parameters behind the verdict, then further details
ParameterVowels Central DiphthongEstill Exercises
Price$4.99Free — better
Rating—5.0 (2 ratings) — better
Positive reviews—37.5% of reviews
Number of ratings—2 — better
Update frequencyEvery 37 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Subscription
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better14.0
Further details — not scored
Size31 MB16 MB
Age rating4+4+
DeveloperBlue Tree Publishing, Inc.Estill Voice International, LLC

In-app purchases

None

Vowels Central Diphthong

No in-app purchases

1 purchases

Estill Exercises

Subscriptions1
  • Estill Exercises Monthly3 Days trial$9.991 Month

Questions

Is Vowels Central Diphthong free?
Vowels Central Diphthong costs $4.99, with no in-app purchases.
Is Estill Exercises free?
Estill Exercises is free to download, with in-app purchases available.
Do Vowels Central Diphthong or Estill Exercises have ads?
Neither Vowels Central Diphthong nor Estill Exercises shows ads.
Which is updated more often, Vowels Central Diphthong or Estill Exercises?
Vowels Central Diphthong ships an update every 37 months, and Estill Exercises every 6 weeks. Most recently, Vowels Central Diphthong was updated on October 23, 2026 and Estill Exercises on October 17, 2026.

Other comparisons