Number Builder vs IEW Writing Toolbox
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.
IEW Writing Toolbox
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IEW Writing Toolbox app is the perfect tool for IEW students and teachers! It includes the IEW structural models and stylistic techniques, clearly explained and easy to apply. The search for a word features a focused thesaurus, helping you find -ly adverbs, strong verbs, and quality adjectives to enhance any composition. This toolbox contains everything writers need to write with structure and style—all in one convenient app.
Screenshots
Verdict
The clearest difference is price: Number Builder at Free against IEW Writing Toolbox's $1.99. IEW Writing Toolbox's advantage is in-app purchases (none vs 1) and update cadence (every 5 weeks vs every 39 months). On ads and device support 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
Number Builder is free to download; IEW Writing Toolbox costs $1.99 up front. Number Builder sells 1 one-off in-app purchase. IEW Writing Toolbox asks for nothing beyond the download.
Number Builder ships an update every 39 months, IEW Writing Toolbox every 5 weeks. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.
| Parameter | Number Builder | IEW Writing Toolbox |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.9 (7 ratings) — better | — |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 39 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Best chart rank | — | #60 — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | Widgetilities LLC | Institute for Excellence in Writing |
In-app purchases
Number Builder
- Unlock Challenge Mode$1.99
IEW Writing Toolbox
No in-app purchases
Questions
Is Number Builder free?
Is IEW Writing Toolbox free?
Do Number Builder or IEW Writing Toolbox have ads?
Which is updated more often, Number Builder or IEW Writing Toolbox?
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