# Hydro Dip vs Flag Quiz

The clearest difference is in-app purchases: Hydro Dip at none against Flag Quiz's 3. Hydro Dip also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). Flag Quiz's advantage is ads (none vs shown). On price and update cadence there is nothing between them.

Both are free to download. Flag Quiz sells 3 in-app purchases, starting at $2.99 per 7 days. Hydro Dip asks for nothing beyond the download.

Hydro Dip ships an update every 2 months, Flag Quiz monthly. The most recent releases landed on October 2, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Hydro Dip | Flag Quiz |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/flag-quiz-learn-countries/id6771483887/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 91 MB | 9 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Maksym Kiryanov](https://appshunter.io/developer/1628335944) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### Hydro Dip

[App page](https://appshunter.io/ios/app/hydro-dip/id6450416095)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flag Quiz

[App page](https://appshunter.io/ios/app/flag-quiz-learn-countries/id6771483887)

Learn and memorize flags from all 196 countries with interactive quizzes and study tools. Master geography through flashcards, a searchable atlas, and progress tracking. Daily reminders help build a consistent learning habit.

**Highlights:** Learn 196 country flags, Four game modes, Region-specific flashcards, Searchable world atlas, Mastery heatmap and progress tracking, Daily learning reminders

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Capitals Mode · Weekly | $2.99 | per 7 days |
| Full Atlas Access · Yearly | $14.99 | per year |
| All Continents · Pay Once | $29.99 | one-time |


## Frequently asked questions

### Is Hydro Dip free?

Hydro Dip is free to download, with no in-app purchases.

### Is Flag Quiz free?

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

### Do Hydro Dip or Flag Quiz have ads?

Hydro Dip shows ads; Flag Quiz does not.

### Which is updated more often, Hydro Dip or Flag Quiz?

Hydro Dip ships an update every 2 months, and Flag Quiz monthly. Most recently, Hydro Dip was updated on October 2, 2026 and Flag Quiz on October 12, 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.*