Comparison

Number Builder vs NumberSlam®

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

Head to head
About

Number Builder

This app helps solve math puzzles by calculating all possible equations from dice rolls and a target number. It supports basic arithmetic, powers, and roots, making it a useful tool for games like Number Knockout.

Highlights
  • Calculates all possible solutions
  • Supports basic arithmetic
  • Includes powers and roots
  • Input dice rolls and target number
  • Useful for Number Knockout game
Features
Read full description

Number Builder turns dice rolls into a hands-on way to practice mental math. SOLVE MODE Roll three dice, enter a target number, and see every way to combine your dice — using addition, subtraction, multiplication, division, exponents, and roots — to reach it. Great for checking your own work or discovering paths you hadn't thought of. CHALLENGE MODE Roll a set of dice and a target, then build the answer yourself — tapping dice and operators into place, left to right, with instant feedback when you're right. Six levels of difficulty take you from simple addition all the way up to exponents, fractional exponents, and roots, with targets up to 1,000. Challenge mode includes 3 free puzzles to try. After that, it unlocks with a single one-time purchase — no subscriptions, and Family Sharing means one purchase covers your whole family. BUILT FOR PRACTICE Six progressively harder levels, each changing exactly one thing about the challenge Customizable dice colors and styles Full support for larger text sizes and VoiceOver Solve mode stays completely free, no purchase required No data is collected. No ads, ever.

About

NumberSlam®

This is a fast-paced mental math game designed to enhance your calculation skills on mobile. It's a digital adaptation of a popular classroom game, offering an engaging way to practice math for fun or improvement. The game is ad-free and tracks no user data for a safe, distraction-free experience.

Highlights
  • Improves mental math skills
  • Engaging and fast-paced gameplay
  • Digital remake of a popular classroom game
  • Ad-free experience
  • Tracking-free for user privacy
  • Suitable for practice or fun
Features
Read full description

Finally, an engaging, exciting, and fast-paced mental math skills game. NumberSlam® was created to improve your mental math skills on a mobile device. NumberSlam® is a digital remake of the popular math game “Board Slam” played in Classical Conversations Communities’ classrooms around the world. Whether playing for fun or practice, NumberSlam® is THE mental math game for you. Perfect for CC students, their parents or anyone that enjoys a good mental math challenge. NumberSlam® is Ad-Free & tracking-free so that your game-play is safe and free from distractions. We hope you like it, now Get Slamming!

Screenshots

Number Builder4 screens
NumberSlam®4 screens

Verdict

The call

The clearest difference is update cadence: NumberSlam® at every 6 days against Number Builder's every 39 months. NumberSlam® also leads on iOS requirement (13.0 vs 17.0). On price, rating, review sentiment and ratings volume 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. Number Builder sells 1 one-off in-app purchase and NumberSlam® sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Number Builder against 5.0 for NumberSlam®. Both are backed by a comparable volume of ratings — 7 and 7 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Number Builder ships an update every 39 months, NumberSlam® every 6 days. The most recent releases landed on August 12, 2026 and June 1, 2026 respectively.

Scorecard2 real differences · 8 level
Number Builder versus NumberSlam®: the parameters behind the verdict, then further details
ParameterNumber BuilderNumberSlam®
PriceFreeFree
Rating4.9 (7 ratings)5.0 (7 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings77
Update frequencyEvery 39 monthsEvery 6 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.013.0 — better
Further details — not scored
Size4 MB31 MB
Age rating4+4+
DeveloperWidgetilities LLCPIRUX, LLC

Customer experience

Number Builder

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

NumberSlam®

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Number Builder

One-time1
  • Unlock Challenge Mode$1.99
1 purchases

NumberSlam®

One-time1
  • Activate NumberSlam$7.99

Questions

Is Number Builder free?
Number Builder is free to download, with in-app purchases available.
Is NumberSlam® free?
NumberSlam® is free to download, with in-app purchases available.
Which has better reviews, Number Builder or NumberSlam®?
NumberSlam® is rated higher. Number Builder averages 4.9 out of 5 from 7 ratings, while NumberSlam® averages 5.0 from 7 ratings.
Do Number Builder or NumberSlam® have ads?
Neither Number Builder nor NumberSlam® shows ads.
Which is updated more often, Number Builder or NumberSlam®?
Number Builder ships an update every 39 months, and NumberSlam® every 6 days. Most recently, Number Builder was updated on August 12, 2026 and NumberSlam® on June 1, 2026.

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