# Math Decoder vs Kjernesyrer

The clearest difference is price: Math Decoder at $0.99 against Kjernesyrer's $1.99. Math Decoder also leads on iOS requirement (12.0 vs 16.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Math Decoder costs $0.99 and Kjernesyrer $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Math Decoder ships an update every 36 months, Kjernesyrer every 24 months. The most recent releases landed on September 20, 2026 and July 23, 2026 respectively.

## The numbers

| Metric | Math Decoder | Kjernesyrer |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 24 months** |
| Size | 28 MB | 4 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPad | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Torgeir Holen](https://appshunter.io/developer/640499199) |

## What reviewers say

### Math Decoder

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Kjernesyrer

[App page](https://appshunter.io/ios/app/kjernesyrer/id1434524925)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Math Decoder free?

Math Decoder costs $0.99, with no in-app purchases.

### Is Kjernesyrer free?

Kjernesyrer costs $1.99, with no in-app purchases.

### Do Math Decoder or Kjernesyrer have ads?

Neither Math Decoder nor Kjernesyrer shows ads.

### Which is updated more often, Math Decoder or Kjernesyrer?

Math Decoder ships an update every 36 months, and Kjernesyrer every 24 months. Most recently, Math Decoder was updated on September 20, 2026 and Kjernesyrer on July 23, 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.*