Slapstack Math vs SoundEcho
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.
SoundEcho
A fun and accessible memory game using sound cues. Players match pairs of buttons that produce the same sound to clear the board. Supports multiple sound themes and player counts, with Game Center integration.
- Sound-based memory matching
- VoiceOver accessibility
- Animal and computer sound themes
- Multiple difficulty levels (10, 15, 20 sounds)
- 2-4 player real-time multiplayer
- Game Center integration
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SoundEcho is a memory game with sounds that is easy to play and fully accessible with VoiceOver. SoundEcho is enjoyable for blind, low vision and sighted players alike. The gameplay is simple. Buttons showing a letter, number or smiley are spread across the screen. Tap a button to hear a sound. If two different buttons produce the same sound, they disappear. Find all matching sounds as quickly as possible with as few taps as you can. Choose from 4 sound categories: the classic animal and computer sounds, or the alternative traffic and musical instrument sounds. Each game contains 10, 15 or 20 sound pairs. SoundEcho integrates Game Center so you can compare scores, track achievements and play real-time matches with 2 to 4 players. SoundEcho was nominated for the 2023 Golden Apple Awards by the AppleVis website. Try SoundEcho for free today.
Screenshots
Verdict
The clearest difference is rating: Slapstack Math at 5.0 against SoundEcho's 4.3. Slapstack Math also leads on in-app purchases (none vs 1) and iOS requirement (8.0 vs 17.0). SoundEcho's advantage is update cadence (every 5 weeks vs every 19 months). On price, review sentiment, ratings volume and ads 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. SoundEcho sells 1 one-off in-app purchase. Slapstack Math asks for nothing beyond the download.
Slapstack Math holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Slapstack Math ships an update every 19 months, SoundEcho every 5 weeks. The most recent releases landed on September 13, 2026 and September 25, 2026 respectively.
| Parameter | Slapstack Math | SoundEcho |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.3 (3 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 19 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 5 MB | 7 MB |
| Age rating | 4+ | 12+ |
| Developer | American Printing House for the Blind (APH) | Kristof Nijs |
Customer experience
Slapstack Math
SoundEcho
In-app purchases
Slapstack Math
No in-app purchases
SoundEcho
- Purchasing the app$4.49







