Comparison

Slapstack Math vs SoundEcho

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

Head to head
About

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.

Highlights
  • 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
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

Slapstack Math3 screens
SoundEcho3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SoundEcho sells 1 one-off in-app purchase. Slapstack Math asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Slapstack Math versus SoundEcho: the parameters behind the verdict, then further details
ParameterSlapstack MathSoundEcho
PriceFreeFree
Rating5.0 (2 ratings) — better4.3 (3 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings23 — better
Update frequencyEvery 19 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS8.0 — better17.0
Further details — not scored
Size5 MB7 MB
Age rating4+12+
DeveloperAmerican Printing House for the Blind (APH)Kristof Nijs

Customer experience

Slapstack Math

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SoundEcho

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Slapstack Math

No in-app purchases

1 purchases

SoundEcho

One-time1
  • Purchasing the app$4.49

Questions

Is Slapstack Math free?
Slapstack Math is free to download, with no in-app purchases.
Is SoundEcho free?
SoundEcho is free to download, with in-app purchases available.
Which has better reviews, Slapstack Math or SoundEcho?
Slapstack Math is rated higher. Slapstack Math averages 5.0 out of 5 from 2 ratings, while SoundEcho averages 4.3 from 3 ratings.
Do Slapstack Math or SoundEcho have ads?
Neither Slapstack Math nor SoundEcho shows ads.
Which is updated more often, Slapstack Math or SoundEcho?
Slapstack Math ships an update every 19 months, and SoundEcho every 5 weeks. Most recently, Slapstack Math was updated on September 13, 2026 and SoundEcho on September 25, 2026.

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