# Hydropolis vs Philosophai

The clearest difference is update cadence: Philosophai at every 2 days against Hydropolis's every 10 months. Hydropolis's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 26.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Hydropolis ships an update every 10 months, Philosophai every 2 days. The most recent releases landed on October 21, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Hydropolis | Philosophai |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/philosophai/id6761296125/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 days** |
| Monetization | Free | Free |
| Size | 118 MB | 18 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [miejskie przedsiebiorstwo wodociagow i kanalizacji s.a](https://appshunter.io/developer/1444870860) | [Till Bruegmann](https://appshunter.io/developer/1690039205) |

## 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


### Philosophai

[App page](https://appshunter.io/ios/app/philosophai/id6761296125)

Engage in intellectual discussions with two AI-powered fish debating profound questions. Enjoy a unique, calming experience that offers a thought-provoking break from social media.

**Highlights:** AI-powered conversational fish, Debates on existential questions, Calming digital aquarium visuals, Dynamic, unpredictable conversations, Ad-free and subscription-free experience

**In-app purchases:** none


## Frequently asked questions

### Is Hydropolis free?

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

### Is Philosophai free?

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

### Do Hydropolis or Philosophai have ads?

Neither Hydropolis nor Philosophai shows ads.

### Which is updated more often, Hydropolis or Philosophai?

Hydropolis ships an update every 10 months, and Philosophai every 2 days. Most recently, Hydropolis was updated on October 21, 2026 and Philosophai on October 28, 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.*