# ReefDoser vs Pocket Marine

The clearest difference is price: ReefDoser at Free against Pocket Marine's $3.99. ReefDoser also leads on iOS requirement (10.0 vs 14.0). Pocket Marine's advantage is rating (4.8 vs 1.0) and update cadence (fortnightly vs every 3 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

ReefDoser 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 1.0. That said, the two scores are not equally well evidenced: Pocket Marine has 597 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 54% of ReefDoser's written reviews are positive against 79% of Pocket Marine's.

ReefDoser ships an update every 3 months, Pocket Marine fortnightly. Both last shipped on November 1, 2026.

## The numbers

| Metric | ReefDoser | Pocket Marine |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/reefdoser/id353011315/reviews) | **[4.8 (597 ratings)](https://appshunter.io/ios/app/pocket-marine/id999538938/reviews)** |
| Number of ratings | 1 | **597** |
| Positive reviews | 54.2% of reviews | **78.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 23 MB | 213 MB |
| Requires iOS | **10.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Pixelwand Ltd](https://appshunter.io/developer/353011318) | [Liam Salmons](https://appshunter.io/developer/999538937) |

## What reviewers say

### ReefDoser

[App page](https://appshunter.io/ios/app/reefdoser/id353011315)

This app helps tropical marine aquarium owners calculate precise dosages for essential elements like Calcium, Magnesium, and Alkalinity. It features an extensive database of over 70 products to ensure optimal water parameters for your reef tank.

**Highlights:** Element dosage calculation, Calcium, Magnesium, Alkalinity tracking, Potassium, Iodine, Strontium, Boron, Silicate, Product database (70+ items), Tropical marine aquarium focus

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is ReefDoser free?

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

### Is Pocket Marine free?

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

### Which has better reviews, ReefDoser or Pocket Marine?

Pocket Marine is rated higher. ReefDoser averages 1.0 out of 5 from 1 ratings, while Pocket Marine averages 4.8 from 597 ratings.

### Do ReefDoser or Pocket Marine have ads?

Neither ReefDoser nor Pocket Marine shows ads.

### Which is updated more often, ReefDoser or Pocket Marine?

ReefDoser ships an update every 3 months, and Pocket Marine fortnightly. Most recently, ReefDoser was updated on November 1, 2026 and Pocket Marine on November 1, 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.*