Math Duel vs Circle and Sphere Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Math Duel
This educational game makes learning money management skills fun and engaging for students. Players practice counting coins, calculating dollars, and making change through customizable challenges. It's designed to boost confidence and mathematical prowess in a dynamic, interactive way.
- Counting coins and dollars
- Making change calculations
- Customizable gameplay settings
- Skill level adaptation
- Confidence building
- Interactive learning
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Calling all educators! Grab a FREE promo code for Money Duel - Email Erik at ElliesGames.com today! Introducing Money Math Duel: Where Learning and Fun Coincide Crafted with love, Money Math Duel is the brainchild of a parent on a mission to make learning money management exciting. Tailored for growing students like my daughter, this game is the ultimate tool to master currency skills while having a blast! - Counting coins, calculating dollars, and making change become a thrilling adventure. - Customize gameplay to match any skill level and create a level playing field. - Boost confidence and mathematical prowess, one dollar at a time. Imagine players honing their skills in a dynamic showdown, with each round designed to enhance their grasp of money math. Plus, with adaptable settings, it's the ultimate equalizer. Whether you're a math maestro or just diving into dollars, tailor the game to fit your learning journey. Picture one player focusing on questions between $15 and $20, while the other perfects their prowess between $0.01 and $1. Empower your students with financial finesse today. Don't miss out—reach out to Erik at ElliesGames.com for an exclusive FREE promo code. Elevate learning, one coin flip at a time!
Circle and Sphere Pro
This app calculates various geometric quantities for circles and spheres, including sectors and segments. It supports decimals and fractions, displays formulas and solutions step-by-step, and stores calculations in a history. Users can share their results.
- Calculates sphere and circle quantities
- Supports sectors and segments
- Shows formulas and step-by-step solutions
- Handles decimals and fractions
- Stores calculations in history
- Allows sharing of results
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This app calculates all quantities of a sphere (body of a sphere, circle, all parts of sector and segment). Therefore you must enter some variables (like the radius of a circle and the central angle). The algorithm searches the formulas of the missing quantities, shows them and calculates the results. Decimals and fractions are supported. The solution is shown step by step. All calculations are stored in the history. The final solution can be shared. [ Content ] - all important quantities for the circle and sphere calculation - formulas for all important quantities of a sphere, circle, sector and the segment - infographic to illustrate the topic - search bar to find the desired quantity - history function to save input - detailed solution - positive numbers, decimals and fractions are supported - no ads! [ Usage ] - there are several fields for entering the values using a special keyboard - if values are missing, all fields are highlighted in orange - if values are oppositions (like "r = 1 and d = 3"), one affected field is highlighted in red - every value must be positive - maximum of alpha is 360° - beta must be less than 90° - if a value is no number, it is highlighted in red - the entries in the history can be deleted or sorted manually - if you select an entry in the history, it will be loaded automatically for the calculation - the entire history can be deleted by pressing a button - solutions can be shared
Screenshots
Verdict
Math Duel and Circle and Sphere Pro both sit at 5.0 stars, but that hides the real split: 100% of Math Duel's written reviews are positive against 67% of Circle and Sphere Pro's. Math Duel also leads on price ($1.99 vs $2.99) and iOS requirement (11.0 vs 15.0). Circle and Sphere Pro's advantage is update cadence (monthly vs every 34 months). On rating, ratings volume, ads and in-app purchases 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
Math Duel costs $1.99 and Circle and Sphere Pro $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Math Duel against 4.9 for Circle and Sphere Pro. Both are backed by a comparable volume of ratings — 6 and 7 respectively. Written reviews are what separate them: 100% of Math Duel's written reviews are positive against 67% of Circle and Sphere Pro's.
Math Duel ships an update every 34 months, Circle and Sphere Pro monthly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Math Duel | Circle and Sphere Pro |
|---|---|---|
| Price | $1.99 — better | $2.99 |
| Rating | 5.0 (6 ratings) — better | 4.9 (7 ratings) |
| Positive reviews | 100.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 6 | 7 — better |
| Update frequency | Every 34 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 54 MB | 180 MB |
| Age rating | 4+ | 4+ |
| Developer | Ellie's Games, LLC | Glindemann, Sennoun, Langer GbR |
Customer experience
Math Duel
Circle and Sphere Pro
In-app purchases
Math Duel
No in-app purchases
Circle and Sphere Pro
No in-app purchases
Questions
Is Math Duel free?
Is Circle and Sphere Pro free?
Which has better reviews, Math Duel or Circle and Sphere Pro?
Do Math Duel or Circle and Sphere Pro have ads?
Which is updated more often, Math Duel or Circle and Sphere Pro?
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