Comparison

Number Builder vs Spell It! Spelling for Kids

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

Spell It! Spelling for Kids

This app offers twelve engaging games designed to make spelling practice fun for children from kindergarten to middle school. It features customizable word lists, progress tracking with positive reinforcement, and a completely private experience with no accounts or ads.

Highlights
  • Twelve unique spelling games
  • Customizable word lists
  • Four difficulty levels
  • Progress tracking with streaks
  • Kid-friendly clues and sentences
  • Offline play
Features
Read full description

Spell It! makes spelling practice feel like recess. Twelve playful games help kids from kindergarten through middle school master their words — no accounts, no ads, and nothing to buy. TWELVE WAYS TO PRACTICE • Word Scramble — untangle mixed-up letter tiles • Missing Letters — fill the gaps from a letter bank • Listen & Spell — hear the word out loud, then type it • Spot the Word — pick the real spelling out of four fakes • Flash Spell — memorize the word before it hides • Fix the Sentence — find and fix the misspelled word • Ending Machine — learn the rules for -ing, -es, and -ed • Mini Crossword — five words, one cozy grid • Word Search — hunt words across, down, and diagonal • Memory Match — pair each word with its meaning • Balloon Pop — guess letters before the balloons pop • Daily Bee — a fresh mixed challenge every day, with streaks MADE FOR FAMILIES • Four levels, from first words like "cat" to stumpers like "mischievous" • 340 built-in words, every one with a kid-friendly clue and sentence • Bonus lists: Sight Words, Commonly Misspelled, and Animals & Nature • Build your own word lists — perfect for homeschool spelling and weekly word lists • Stars, streaks, and gentle second chances keep practice positive • Words are read aloud with clear text-to-speech PRIVATE BY DESIGN No accounts. No ads. No tracking. Everything stays on the device.

Screenshots

Number Builder4 screens
Spell It! Spelling for Kids4 screens

Verdict

The call

The clearest difference is price: Number Builder at Free against Spell It! Spelling for Kids's $2.99. Number Builder also leads on ratings volume (10 vs 1). Spell It! Spelling for Kids's advantage is in-app purchases (none vs 1) and rating (5.0 vs 4.6). On ads, device support and iOS requirement 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

Number Builder is free to download; Spell It! Spelling for Kids costs $2.99 up front. Number Builder sells 1 one-off in-app purchase. Spell It! Spelling for Kids asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Spell It! Spelling for Kids holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Number Builder has 10 ratings behind it against 1, so its average is the more settled of the two.

Scorecard5 real differences · 5 level
Number Builder versus Spell It! Spelling for Kids: the parameters behind the verdict, then further details
ParameterNumber BuilderSpell It! Spelling for Kids
PriceFree — better$2.99
Rating4.6 (10 ratings)5.0 (1 ratings) — better
Positive reviews80.0% of reviews—
Number of ratings10 — better1
Update frequencyEvery 39 months—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree — betterPaid
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size4 MB1 MB
Age rating4+4+
DeveloperWidgetilities LLCSkdaddle LLC

In-app purchases

1 purchases

Number Builder

One-time1
  • Unlock Challenge Mode$1.99
None

Spell It! Spelling for Kids

No in-app purchases

Questions

Is Number Builder free?
Number Builder is free to download, with in-app purchases available.
Is Spell It! Spelling for Kids free?
Spell It! Spelling for Kids costs $2.99, with no in-app purchases.
Which has better reviews, Number Builder or Spell It! Spelling for Kids?
Spell It! Spelling for Kids is rated higher. Number Builder averages 4.6 out of 5 from 10 ratings, while Spell It! Spelling for Kids averages 5.0 from 1 ratings.
Do Number Builder or Spell It! Spelling for Kids have ads?
Neither Number Builder nor Spell It! Spelling for Kids shows ads.

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