Slapstack Math vs EchoVis Quiz
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Slapstack Math
This game turns math flashcards into a fast-paced action and memory challenge. Players slap the table or perform other actions based on math problems and their answers, with customizable rules and difficulty.
- Math flashcard gameplay
- Customizable action rules
- Addition, subtraction, multiplication, division modes
- Self-voicing and VoiceOver compatible
- High-contrast colors and large print
- Adjustable game speed
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Slapstack Math™ is an action and memory game that uses math flash cards instead of playing cards. Slapstack Math is fully accessible for all users. The goal is to collect the most points by pulling in the most cards. Two to eight players can play on the iPad®, or two to four players on the iPhone® or iPod® Touch. When the game starts, cards with single numbers are dealt and announced. At first, the only rule is to slap the table when an 11 comes up on the screen. The first player to slap the table gets to claim all the cards that have been dealt up to that time. After a while, you may want to add more rules – for example, players have to raise their arms and yell “Whee!” when an 8 comes up, and clap their hands when a 3 appears (and still slap the table on 11’s). You may add as many new rules as you want, making the game a little crazier each time. The real challenge with Slapstack Math comes when you change the single number cards to math flash cards. You may choose one of the following game variations: Addition – displays addition problems with sums from 2-12. Subtraction – subtraction problems with differences from 1-11. Multiplication – multiplication problems with products from 1-12. Division – division problems, using numbers up to 24, with quotients from 1-12. Addition and Subtraction – a mixture of problems from these two operations. Multiplication and Division – a mixture of problems from these two operations. All Four Operations – a mixture of problems from all of the operations. When playing the games using math operations, players have to calculate the answer to the problem before doing any required action. For example, if the problem is 7 + 4, players must come up with the answer, 11, and then slap the table (which is the required action for 11’s). If several numbers have actions assigned to them, players will have to do a lot of calculation, mental association, and even physical movement to play the game! Features: * Supports math learning objectives. * All game features are fully self-voicing. * Fully compatible with VoiceOver. * High-contrast colors and large print numbers. * Change the speed of play for different situations. Slapstack Math provides an enjoyable and motivating practice tool for basic math operations, a recreational app for fun, or a reward after classwork. Recommended ages: 7 and up.
EchoVis Quiz
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Welcome to the EchoVis Quiz game. We hope that it will help you improve your hearing sensitivity – and its effectiveness. It will increase your skills in the field of recognizing sound propagation in various environments, its reflections, distortions, and the knowledge of the echolocation phenomenon. The main objectives of the game are: • Improving the ability to use the hearing organ, • Learning the skill of using echolocation, • Providing entertainment through competing with other players – ranking. The game essentially targets anyone without a significant hearing dysfunction. You can play it with, and compete against your family members, friends or yourself. Its educational aspect is also vital in the case of the blind and visually impaired. The game makes it possible to get accustomed to sounds in different spaces: at home, in the forest, between buildings, on busy streets, inside such structures as train stations, etc. All the above can be achieved in the safe and peaceful surroundings of your home. You do not have to go anywhere. We will “teleport” you to many interesting places. All you need are your headphones, a smartphone, and our app. Each of the questions and the suggested answers relate to a sound recording. Questions are illustrated using various audio recordings: classic stereo, binaural recordings and other. This is why we strongly recommend using proper headphones that enable receiving stereo-quality sound. In the light of the above, correctly putting the headphone on the proper ear – right and left – will be crucial. More advanced users can also use adequately spaced speaker sets for this purpose. Some of the recordings were made in a specially prepared space using reflective or sound-attenuating walls and clickers that emit waves of various frequencies. They enable testing yourself under highly demanding acoustic conditions and learning to focus on very specific aspects of various sound phenomena. The game contains packages comprising 50 recordings. The number 0 package is free of charge. You will have to pay a small amount for each subsequent one. The first edition contains packages 0 and 1. We plan to deliver successive ones in the future. We wish you productive learning and high-ranking records.
Screenshots
Verdict
The clearest difference is in-app purchases: Slapstack Math at none against EchoVis Quiz's 6. Slapstack Math also leads on iOS requirement (8.0 vs 13.0). EchoVis Quiz's advantage is update cadence (every 6 months vs every 19 months). On price, 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
Both are free to download. EchoVis Quiz sells 6 one-off in-app purchases. Slapstack Math asks for nothing beyond the download.
Slapstack Math ships an update every 19 months, EchoVis Quiz every 6 months. The most recent releases landed on June 1, 2026 and September 20, 2026 respectively.
| Parameter | Slapstack Math | EchoVis Quiz |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 19 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 5 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | American Printing House for the Blind (APH) | Transition Technologies S.A. |
In-app purchases
Slapstack Math
No in-app purchases
EchoVis Quiz
- Package 1$1.99
- Package 2$1.99
- Package 3$1.99
Show 3 moreShow fewer
- Package 4$1.99
- Package 6$1.99
- Package 5$1.99
Questions
Is Slapstack Math free?
Is EchoVis Quiz free?
Do Slapstack Math or EchoVis Quiz have ads?
Which is updated more often, Slapstack Math or EchoVis Quiz?
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