# Pocket Marine vs Hydor App

The clearest difference is review sentiment: Pocket Marine at 79% against Hydor App's 10%. Pocket Marine also leads on rating (4.8 vs 1.4) and update cadence (fortnightly vs every 3 months). Hydor App's advantage is price (Free vs $3.99) and iOS requirement (11.0 vs 14.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

Hydor App is free to download; Pocket Marine costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pocket Marine holds the better App Store score, 4.8 against 1.4. That said, the two scores are not equally well evidenced: Pocket Marine has 597 ratings behind it against 52, so its average is the more settled of the two. Written reviews point the same way: 79% of Pocket Marine's written reviews are positive against 10% of Hydor App's.

Pocket Marine ships an update fortnightly, Hydor App every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Pocket Marine | Hydor App |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.8 (597 ratings)](https://appshunter.io/ios/app/pocket-marine/id999538938/reviews)** | [1.4 (52 ratings)](https://appshunter.io/ios/app/hydor-app/id1577972620/reviews) |
| Number of ratings | **597** | 52 |
| Positive reviews | **78.8% of reviews** | 10.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | Free | Free |
| Size | 213 MB | 45 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Liam Salmons](https://appshunter.io/developer/999538937) | [Ferplast S.p.a.](https://appshunter.io/developer/1577972622) |

## What reviewers say

### Pocket Marine

[App page](https://appshunter.io/ios/app/pocket-marine/id999538938)

Manage all your aquarium data in one place. Track water parameters, inhabitants, dosing, and maintenance with detailed logs and reminders. Access an extensive library of marine species to make informed decisions about new additions.

**Highlights:** Marine species encyclopedia (800+), Water parameter testing journal, Inhabitant and dosing logs, Maintenance and water change journals, Species compatibility guide, Useful calculators, Customizable reminders

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

**In-app purchases:** none

**What reviewers like**

- 👍 Helpful for tracking parameters
- 🚀 Fantastic data base
- 👍 Well designed app
- 👍 Comprehensive features
- 👍 Useful for new marine aquarium keepers

**What reviewers complain about**

- 🐛 Crashes when trying to set up aquarium
- 🐛 Deletes test results
- 🐛 Buggy and unstable
- 🐛 Spelling mistakes
- 🐛 Unable to change default parameters

**Reported bugs**

- Crashes when trying to edit targets/ranges
- Endless scroll to select values
- Inconsistent behavior when switching between Celsius and Fahrenheit
- Crashes when accessing certain sections like soft corals

**Requested features**

- Ability to sync data across devices
- Customizable home screen
- Tracking for spending on tank supplies
- Ability to set default parameters
- Graphs showing multiple parameters together


### Hydor App

[App page](https://appshunter.io/ios/app/hydor-app/id1577972620)

Remotely manage and configure your aquarium devices from anywhere. Set daily programs, create personalized device sets, and receive status notifications to keep your aquarium running smoothly.

**Highlights:** Remote Wi-Fi device management, Configure daily programs, Create personalized device sets, Real-time status notifications, Manage multiple devices

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pocket Marine free?

Pocket Marine costs $3.99, with no in-app purchases.

### Is Hydor App free?

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

### Which has better reviews, Pocket Marine or Hydor App?

Pocket Marine is rated higher. Pocket Marine averages 4.8 out of 5 from 597 ratings, while Hydor App averages 1.4 from 52 ratings.

### Do Pocket Marine or Hydor App have ads?

Neither Pocket Marine nor Hydor App shows ads.

### Which is updated more often, Pocket Marine or Hydor App?

Pocket Marine ships an update fortnightly, and Hydor App every 3 months. Most recently, Pocket Marine was updated on November 6, 2026 and Hydor App on November 3, 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.*