Comparison

Number Builder vs SumSlam

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

SumSlam

Engage with a math-based puzzle game designed to be a productive alternative to endless scrolling. It challenges users to quickly solve equations, aiming to sharpen mathematical skills while providing a mildly frustrating yet engaging experience.

Highlights
  • Swipe-based equation solving
  • Productive doom-scrolling alternative
  • Math skill enhancement
  • Engaging puzzle gameplay
  • Designed for all ages
Features
Read full description

Swipe the equation of the current answer. Pretty easy, my grannie got it on her second try. The main reason I made this app is to reduce doom scrolling with something that is more productive but also frustrating enough that after a while you want to go back to focusing the task at hand. Our mission at BlueJai is to come up with creative solution to modern problem and always keeping the users at the forefront. Hope you love the app and it makes you a little sharper at math.

Screenshots

Number Builder4 screens
SumSlam3 screens

Verdict

The call

The clearest difference is in-app purchases: SumSlam at none against Number Builder's 1. SumSlam also leads on update cadence (every 5 days vs every 39 months) and iOS requirement (15.6 vs 17.0). Number Builder's advantage is ratings volume (7 vs 2). On price, rating, ads and monetization model 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. SumSlam asks for nothing beyond the download.

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 SumSlam. Both are backed by a comparable volume of ratings — 7 and 2 respectively.

UpkeepUpdate frequency

Number Builder ships an update every 39 months, SumSlam every 5 days. The most recent releases landed on October 10, 2026 and September 23, 2026 respectively.

Scorecard4 real differences · 6 level
Number Builder versus SumSlam: the parameters behind the verdict, then further details
ParameterNumber BuilderSumSlam
PriceFreeFree
Rating4.9 (7 ratings)5.0 (2 ratings) — better
Positive reviews80.0% of reviews—
Number of ratings7 — better2
Update frequencyEvery 39 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.6 — better
Further details — not scored
Size4 MB13 MB
Age rating4+4+
DeveloperWidgetilities LLCBLUEJAI LLC

Customer experience

Number Builder

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral20.0%
Negative0.0%

SumSlam

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Number Builder

One-time1
  • Unlock Challenge Mode$1.99
None

SumSlam

No in-app purchases

Questions

Is Number Builder free?
Number Builder is free to download, with in-app purchases available.
Is SumSlam free?
SumSlam is free to download, with no in-app purchases.
Which has better reviews, Number Builder or SumSlam?
SumSlam is rated higher. Number Builder averages 4.9 out of 5 from 7 ratings, while SumSlam averages 5.0 from 2 ratings.
Do Number Builder or SumSlam have ads?
Neither Number Builder nor SumSlam shows ads.
Which is updated more often, Number Builder or SumSlam?
Number Builder ships an update every 39 months, and SumSlam every 5 days. Most recently, Number Builder was updated on October 10, 2026 and SumSlam on September 23, 2026.

Other comparisons