Number Builder vs NumberSlam®
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Calculates all possible solutions
- Supports basic arithmetic
- Includes powers and roots
- Input dice rolls and target number
- Useful for Number Knockout game
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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.
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Number Builder | NumberSlam® |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (7 ratings) | 5.0 (7 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 7 | 7 |
| Update frequency | Every 39 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Widgetilities LLC | PIRUX, LLC |
Customer experience
Number Builder
NumberSlam®
In-app purchases
Number Builder
- Unlock Challenge Mode$1.99
NumberSlam®
- Activate NumberSlam$7.99
Questions
Is Number Builder free?
Is NumberSlam® free?
Which has better reviews, Number Builder or NumberSlam®?
Do Number Builder or NumberSlam® have ads?
Which is updated more often, Number Builder or NumberSlam®?
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