# Fraction Challenge vs HydroValve

The clearest difference is ads: Fraction Challenge at none against HydroValve's shown. Fraction Challenge also leads on iOS requirement (13.0 vs 15.0). HydroValve's advantage is update cadence (daily vs every 2 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Fraction Challenge sells 1 one-off in-app purchase and HydroValve sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Fraction Challenge ships an update every 2 months, HydroValve daily. Both last shipped on November 13, 2026.

## The numbers

| Metric | Fraction Challenge | HydroValve |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (1.5K ratings)](https://appshunter.io/ios/app/fraction-challenge/id1499338364/reviews)** | — |
| Number of ratings | **1.5K** | — |
| Positive reviews | 70.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 89 MB | 63 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Didactoons Games SL](https://appshunter.io/developer/1457185685) | [AbsoluteNoobStudio](https://appshunter.io/developer/1896690388) |

## What reviewers say

### Fraction Challenge

[App page](https://appshunter.io/ios/app/fraction-challenge/id1499338364)

Engage in fun math games designed to teach and reinforce fraction operations. Practice addition, subtraction, multiplication, and division of fractions through interactive challenges. Compete with friends in multiplayer mode to boost mental calculation skills.

**Highlights:** Fraction representation, Addition and subtraction of fractions, Equivalent fractions, Fraction reduction, Multiplication and division of fractions, Multiplayer mode

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get the Full version | $1.99 | one-time |

**What reviewers like**

- 👍 Helps with learning fractions
- 🚀 Fun and engaging game
- 💡 Good for practicing and preparing for tests
- 👍 Competitive and challenging

**What reviewers complain about**

- 🐛 App crashes or doesn't open
- 🕰️ Timer is too fast
- 💰 Not free to play

**Reported bugs**

- App crashes on launch
- Login issues

**Requested features**

- Option to remove timer or increase time
- More game modes (e.g., divided fractions, add/subtract fractions, multiply)
- No battery required to play


### HydroValve

[App page](https://appshunter.io/ios/app/hydrovalve/id6808785143)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Fraction Challenge free?

Fraction Challenge is free to download, with in-app purchases available.

### Is HydroValve free?

HydroValve is free to download, with in-app purchases available.

### Do Fraction Challenge or HydroValve have ads?

HydroValve shows ads; Fraction Challenge does not.

### Which is updated more often, Fraction Challenge or HydroValve?

Fraction Challenge ships an update every 2 months, and HydroValve daily. Most recently, Fraction Challenge was updated on November 13, 2026 and HydroValve on November 13, 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.*