# Hydropolis vs Onet Audio

The clearest difference is in-app purchases: Hydropolis at none against Onet Audio's 8. Hydropolis also leads on iOS requirement (12.0 vs 15.0). Onet Audio's advantage is update cadence (monthly vs every 10 months) and review sentiment (25% vs 17%). On price, ads and device support there is nothing between them.

Both are free to download. Onet Audio sells 8 in-app purchases, starting at $1.99 per month. Hydropolis asks for nothing beyond the download.

Hydropolis ships an update every 10 months, Onet Audio monthly. The most recent releases landed on October 4, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Hydropolis | Onet Audio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.5 (2 ratings)](https://appshunter.io/ios/app/onet-audio/id1612794244/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 16.7% of reviews | **25.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 118 MB | 73 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [miejskie przedsiebiorstwo wodociagow i kanalizacji s.a](https://appshunter.io/developer/1444870860) | [Ringier Axel Springer Polska Sp. z.o.o.](https://appshunter.io/developer/392277216) |

## What reviewers say

### Hydropolis

[App page](https://appshunter.io/ios/app/hydropolis/id1444870861)

Explore a water knowledge center through an audio guide. This app offers interactive exhibits and multimedia content to expand your understanding of water in an engaging and fun way.

**Highlights:** Audio guide functionality, Interactive installations, Multimedia content, Educational information, Engaging user experience

**Features:** macOS Compatibility

**In-app purchases:** none


### Onet Audio

[App page](https://appshunter.io/ios/app/onet-audio/id1612794244)

Access a wide range of podcasts and audio articles from leading Polish media outlets. Stay informed on current events, politics, sports, business, and culture with curated content. Enjoy offline listening and personalized playlists.

**Highlights:** Access to dozens of podcasts, Audio articles from popular journalists, Listen to popular Onet programs, Offline listening support, Create custom playlists, Search by title or journalist

**Features:** Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Onet Premium | $1.99 | per month |
| Onet Premium | $3.99 | per month |
| Onet Premium | $5.99 | per month |
| Onet Premium | $8.99 | per 6 months |
| Onet Premium | $14.99 | per 6 months |
| Onet Premium | $19.99 | per year |
| Onet Premium | $29.99 | per year |
| Onet Premium | $59.99 | per year |


## Frequently asked questions

### Is Hydropolis free?

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

### Is Onet Audio free?

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

### Do Hydropolis or Onet Audio have ads?

Neither Hydropolis nor Onet Audio shows ads.

### Which is updated more often, Hydropolis or Onet Audio?

Hydropolis ships an update every 10 months, and Onet Audio monthly. Most recently, Hydropolis was updated on October 4, 2026 and Onet Audio on October 15, 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.*