# Circle 99 vs Math Decoder

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

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.

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.

## The numbers

| Metric | Circle 99 | Math Decoder |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 36 months** |
| Size | 5 MB | 28 MB |
| Requires iOS | 13.2 | **12.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Ventura Educational Systems](https://appshunter.io/developer/371324172) |

## What reviewers say

### Circle 99

[App page](https://appshunter.io/ios/app/circle-99/id960463726)

**Features:** macOS Compatibility

**In-app purchases:** none


### Math Decoder

[App page](https://appshunter.io/ios/app/math-decoder/id1387526040)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*