Comparison

Circle 99 vs Math Decoder

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Circle 99

Features
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Circle 99 is a challenging puzzle game where the object is to arrange the numbers so that the sum of each circle is 99. Circle 9 provides practice with the addition of integers. Numbers used in the puzzle are decimals and range from 9 to 61. Puzzles are randomly generated and so the game can be played over and over again providing hours of fun. If you like soduku or magic square puzzles then you will love Circle 99. Special features make using Circle 99 fun: 1. Slide numbers into place to solve puzzle. 2. Random puzzles automatically generated. 3. Sound effects.

About

Math Decoder

Features
Read full description

Math Decoder challenges students to solve math problems presented as codes. Find the answer to addition, subtraction, multiplication and division problems by studying the symbols and decoding the numbers. Completing the activities involves using mental math skills. Math Decoder is designed to be a quick math exercise that teachers can use to provide practice in problem solving. Earn a trophy by answering 20 problems. Special sound effects make the game fun to use and the interactive design facilitate problem solving strategies.

Verdict

The call

Circle 99 and Math Decoder are too close to call on the numbers: across 6 compared parameters β€” price, update cadence, ads and in-app purchases among them β€” neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Circle 99 costs $0.99 and Math Decoder $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Circle 99 ships an update every 38 months, Math Decoder every 36 months. The most recent releases landed on June 11, 2026 and September 20, 2026 respectively.

ScorecardNo meaningful differences
Circle 99 versus Math Decoder: the parameters behind the verdict, then further details
ParameterCircle 99Math Decoder
Price$0.99$0.99
Update frequencyEvery 38 monthsEvery 36 months β€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPadiPad
Requires iOS13.212.0 β€” better
Further details β€” not scored
Size5 MB28 MB
Age rating4+4+
DeveloperVentura Educational SystemsVentura Educational Systems

In-app purchases

None

Circle 99

No in-app purchases

None

Math Decoder

No in-app purchases

Questions

Is Circle 99 free?
Circle 99 costs $0.99, with no in-app purchases.
Is Math Decoder free?
Math Decoder costs $0.99, with no in-app purchases.
Do Circle 99 or Math Decoder have ads?
Neither Circle 99 nor Math Decoder shows ads.
Which is updated more often, Circle 99 or Math Decoder?
Circle 99 ships an update every 38 months, and Math Decoder every 36 months. Most recently, Circle 99 was updated on June 11, 2026 and Math Decoder on September 20, 2026.

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