Comparison

Semivowels vs Quantum

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

Head to head
About

Semivowels

This app offers dynamic animations and interactive anatomy views to illustrate the production of American English consonants. It includes detailed explanations of tongue placement and jaw movements, with synchronized audio and a drawing whiteboard for annotation. Designed for professionals and educators, it aids in understanding speech articulation.

Highlights
  • Dynamic consonant animations
  • Interactive anatomy identification
  • Tongue shape and placement views
  • Synchronized audio examples
  • Drawing whiteboard feature
  • Screenshot functionality
Features
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Semivowels 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 three nasal, four non-nasal (with three /r/ variants) consonant 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 consonants 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 .  ◊ 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 three nasal, four non-nasal (with three /r/ variants) consonants of American English.  ◊ Nasal: /m/, /n/, /ŋ/ Non-nasal: /w/, /j/, /l/, /r/ (three variants on /r/)  ◊ Includes a 3 /r/ variant overlay illustration comparing the alveolar, retroflex and velar place of articulation.  ◊ Includes a word and sentence audio example to illustrate consonant articulation for /m/, /n/, /ŋ/, /w/, /j/, /l/ • Animations: each consonant shows a lateral view of dynamic movements of the jaw, lips, tongue, velum (soft palate), and larynx needed for proper articulation of that consonant. Audio for each consonant sound is synchronized with the dynamic animations. Anatomy animation included. • Two finger pan of all animations and key view pages. • Drawing Whiteboard feature:  ◊ Drawing: freeform lines in red, blue, green or black hue.  ◊ Draw and place text directly on active animation and video.  ◊ Text: 36pt, 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. Semivowels app makes learning consonants easy. See example screen shots below. Get the app today!

About

Quantum

Explore the hidden world of particles with a real-time simulator. Model up to 10,000 particles and experiment with natural phenomena like crystallization and orbital mechanics. Customize interactions and visualize results dynamically.

Highlights
  • Real-time particle simulation
  • Model up to 10,000 particles
  • Simulate natural phenomena
  • Four distinct particle classes
  • Customizable rules editor
  • Dynamic visualizations
  • Interactive control
Features
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Experience the hidden world of particles Quantum is a real-time particle life sandbox for exploring emergent motion, artificial physics, and complex systems. Build fields with up to 10,000 particles, tune how classes attract or repel each other, and watch simple rules turn into flowing structures, swarms, or chaotic patterns. Why Quantum stands out: - Real-time particle simulation with four interacting particle classes. - Seamless 2D fields and perspective 3D volumes with touch rotation. - Rule editor for custom attraction and repulsion matrices. - Temperature, viscosity, solid/fluid edge behavior, and force tools. - Black hole and white hole tools for live interaction. - Save and load fields, rule sets, and color schemes. - P3 color support and vivid visual presets for generative art. Use Quantum as a physics toy, creative sandbox, teaching aid, or generative art lab. It is built for people who enjoy science, cellular automata, n-body systems, chaos, and beautiful simulations.

Screenshots

Semivowels4 screens
Quantum4 screens

Verdict

The call

The clearest difference is review sentiment: Quantum at 81% against Semivowels's 0%. Quantum also leads on price (Free vs $4.99) and rating (4.8 vs 2.5). Semivowels's advantage is in-app purchases (none vs 6) and iOS requirement (12.0 vs 26.0). 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

Quantum is free to download; Semivowels costs $4.99 up front. Quantum sells 3 one-off in-app purchases. Semivowels asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Quantum holds the better App Store score, 4.8 against 2.5. That said, the two scores are not equally well evidenced: Quantum has 150 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Semivowels's written reviews are positive against 81% of Quantum's.

UpkeepUpdate frequency

Semivowels ships an update every 37 months, Quantum every 5 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

Scorecard8 real differences · 2 level
Semivowels versus Quantum: the parameters behind the verdict, then further details
ParameterSemivowelsQuantum
Price$4.99Free — better
Rating2.5 (2 ratings)4.8 (150 ratings) — better
Positive reviews0.0% of reviews81.3% of reviews — better
Number of ratings2150 — better
Update frequencyEvery 37 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better26.0
Further details — not scored
Size37 MB32 MB
Age rating4+4+
DeveloperBlue Tree Publishing, Inc.GEORGY OSTROBROD

Customer experience

Semivowels

All ratings2 ratings
Positive0.0%
Neutral50.0%
Negative50.0%
Written reviews2 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

Quantum

All ratings133 ratings
Positive96.2%
Neutral3.0%
Negative0.8%
Written reviews16 reviews
Positive81.3%
Neutral18.8%
Negative0.0%

In-app purchases

None

Semivowels

No in-app purchases

3 purchases

Quantum

One-time3
  • Developer tip2 variants$1.99
  • Developer tip2 variants$3.99
  • Developer tip2 variants$5.99

Questions

Is Semivowels free?
Semivowels costs $4.99, with no in-app purchases.
Is Quantum free?
Quantum is free to download, with in-app purchases available.
Which has better reviews, Semivowels or Quantum?
Quantum is rated higher. Semivowels averages 2.5 out of 5 from 2 ratings, while Quantum averages 4.8 from 150 ratings.
Do Semivowels or Quantum have ads?
Neither Semivowels nor Quantum shows ads.
Which is updated more often, Semivowels or Quantum?
Semivowels ships an update every 37 months, and Quantum every 5 weeks. Most recently, Semivowels was updated on October 23, 2026 and Quantum on October 24, 2026.

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