Comparison

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.

Head to head
About

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.

Highlights
  • Counting coins and dollars
  • Making change calculations
  • Customizable gameplay settings
  • Skill level adaptation
  • Confidence building
  • Interactive learning
Features
Read full description

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!

About

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.

Highlights
  • 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
Features
Read full description

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

Math Duel4 screens
Circle and Sphere Pro4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Math Duel versus Circle and Sphere Pro: the parameters behind the verdict, then further details
ParameterMath DuelCircle and Sphere Pro
Price$1.99 — better$2.99
Rating5.0 (6 ratings) — better4.9 (7 ratings)
Positive reviews100.0% of reviews — better66.7% of reviews
Number of ratings67 — better
Update frequencyEvery 34 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size54 MB180 MB
Age rating4+4+
DeveloperEllie's Games, LLCGlindemann, Sennoun, Langer GbR

Customer experience

Math Duel

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Circle and Sphere Pro

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

None

Math Duel

No in-app purchases

None

Circle and Sphere Pro

No in-app purchases

Questions

Is Math Duel free?
Math Duel costs $1.99, with no in-app purchases.
Is Circle and Sphere Pro free?
Circle and Sphere Pro costs $2.99, with no in-app purchases.
Which has better reviews, Math Duel or Circle and Sphere Pro?
Math Duel is rated higher. Math Duel averages 5.0 out of 5 from 6 ratings, while Circle and Sphere Pro averages 4.9 from 7 ratings.
Do Math Duel or Circle and Sphere Pro have ads?
Neither Math Duel nor Circle and Sphere Pro shows ads.
Which is updated more often, Math Duel or Circle and Sphere Pro?
Math Duel ships an update every 34 months, and Circle and Sphere Pro monthly. Most recently, Math Duel was updated on October 24, 2026 and Circle and Sphere Pro on October 25, 2026.

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