Stroboscopic Effect vs Monster ABC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stroboscopic Effect
Explore the fascinating stroboscopic effect by rotating various objects. Observe how objects can appear to stop or move backward at specific speeds. This app allows you to manipulate rotation direction and speed to witness these optical illusions.
- Rotate 4 different objects
- Adjust rotation speed
- Change rotation direction
- Observe stroboscopic effect
- Supports iPad, iPhone, and Retina display
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Did you ever notice the wheels on the car driving next to you sometimes appear to be spinning backwards? This is referred to as the stroboscopic (or wagon-wheel) effect. It occurs when an object is rotated at certain speeds, making the object to appear to stop or even go backwards. Rotate 4 different objects in either direction (clockwise or counterclockwise). You can increase the speed until you see it appear to stop or reverse. On one of the objects, a wheel with different colored alternating rings, you can make it appear as if the rings of this single option are turning in opposite directions. Universal App - supports native iPad, iPhone and iPhone 4's Retina display. WARNING - Those with Epilepsy or those subject to seizures are usually cautioned to avoid strobe lights or similar effects.
Monster ABC
This educational app uses engaging monsters and interactive audio-visual elements to teach preschoolers letters and initial sounds. It supports literacy acquisition through fun, game-like activities with a motivating reward system.
- Learn letters via initial sounds
- Audio-visual interaction
- Spoken words and letters
- Motivating reward system
- Hand-drawn pictures and sounds
- English and German versions
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▶ Awarded in German ELTERN family magazine’s GIGA-Maus 2013 as "Best Learning Game" in the category "Kids from 4 to 6 years old" ▶ Awarded "Best Children Apps" 2013 in the category "Pre-School Apps" ▶ TOP #1 Education app for children in the German App Store ▶ Amusing monsters make learning letters enormous fun ▶ Perfect for children entering school and those who can’t wait for school to start ▶ The highly popular children’s app Monster ABC is now available in English! Monster ABC guides your child in a really fun way through the process of literacy acquisition. It helps children get to grips with letters and the initial sound of words in the best way possible. WHAT IS AN INITIAL SOUND? Today, little ones use initial sounds to navigate the first stages of literacy acquisition. An initial sound is the first sound of a word and is represented by a letter or a letter combination (like “mm” in the word “mouse” and “sh” in the word “sheep”). Children learn how to make out the initial sound of a word and match it to a letter. FEATURES • Learn letters based on initial sounds • Audio-visual interaction makes learning fun • Words and letters are spoken when tapped • Feedback spoken in a voice perfect for kids • English and German version included • English spoken with a charming British accent • Motivating reward system • Lovingly hand-drawn pictures and amusing sounds • Get to know the monsters Max, Bob, Sally and the rest of the gang! • Increasing level of difficulty • Full initial-sound table available to download free of charge How does Monster ABC support literacy acquisition? • The app helps children to learn letters and the sound they make in a fun way by using pictures. Each picture represents a word whose initial sound must be matched to the corresponding letter. If the initial sound and letter match, your child will enjoy a true sense of achievement. In doing so, the child easily recognizes the correct combination of initial sound and letter. The learning process is supported interactively with visualizations and sounds that are perfect for children. • In addition, a free-of-charge initial-sound table, featuring pictures and their matching initial sounds from Monster ABC, can be downloaded from the wonderkind website: https://s3.amazonaws.com/wk-anlaute/wonderkind_initial_sound_table.pdf • Monster ABC was developed together with grandparents, parents, and kids, taking into account professional pedagogical and linguistic considerations. Support information: We have thoroughly tested this app on all iOS devices. If you do however experience problems, please understand that we are unable to provide support on the basis of comments in the reviews section. Please e-mail our Support Team so we can respond and provide assistance quickly. Thanks very much.
Screenshots
Verdict
The clearest difference is price: Stroboscopic Effect at Free against Monster ABC's $4.99. Stroboscopic Effect also leads on review sentiment (100% vs 85%) and ratings volume (18 vs 2). Monster ABC's advantage is rating (4.5 vs 2.7) and update cadence (every 3 months vs every 84 months). On ads, in-app purchases 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
Stroboscopic Effect is free to download; Monster ABC costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Monster ABC holds the better App Store score, 4.5 against 2.7. That said, the two scores are not equally well evidenced: Stroboscopic Effect has 18 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 100% of Stroboscopic Effect's written reviews are positive against 85% of Monster ABC's, so the app with the better star average is not the one people write more warmly about.
Stroboscopic Effect ships an update every 84 months, Monster ABC every 3 months. The most recent releases landed on October 6, 2026 and October 16, 2026 respectively.
| Parameter | Stroboscopic Effect | Monster ABC |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 2.7 (18 ratings) | 4.5 (2 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 85.4% of reviews |
| Number of ratings | 18 — better | 2 |
| Update frequency | Every 84 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 3 MB | 176 MB |
| Age rating | 4+ | 4+ |
| Developer | Magnin & Associates | wonderkind GmbH |
Customer experience
Stroboscopic Effect
Monster ABC
In-app purchases
Stroboscopic Effect
No in-app purchases
Monster ABC
No in-app purchases
Questions
Is Stroboscopic Effect free?
Is Monster ABC free?
Which has better reviews, Stroboscopic Effect or Monster ABC?
Do Stroboscopic Effect or Monster ABC have ads?
Which is updated more often, Stroboscopic Effect or Monster ABC?
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