# Dolphin Count vs Master

The clearest difference is price: Dolphin Count at Free against Master's $1.99. Dolphin Count also leads on iOS requirement (10.0 vs 15.0). Master's advantage is update cadence (fortnightly vs every 10 months) and ratings volume (94 vs 2). On ads, in-app purchases and device support there is nothing between them.

Dolphin Count is free to download; Master costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Master holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Master has 94 ratings behind it against 2, so its average is the more settled of the two.

Dolphin Count ships an update every 10 months, Master fortnightly. The most recent releases landed on June 11, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Dolphin Count | Master |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/dolphin-count/id1458899127/reviews) | **[4.7 (94 ratings)](https://appshunter.io/ios/app/master-nav/id1602390396/reviews)** |
| Number of ratings | 2 | **94** |
| Positive reviews | — | 96.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Fortnightly** |
| Monetization | **Free** | Paid |
| Size | 90 MB | 117 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lowcountry Marine Mammal Network](https://appshunter.io/developer/1458899126) | [Peterjohn Chisholm](https://appshunter.io/developer/1602390398) |

## What reviewers say

### Dolphin Count

[App page](https://appshunter.io/ios/app/dolphin-count/id1458899127)

Contribute to marine mammal research by collecting real-time data on local dolphins. This free, family-friendly application requires no prior experience and helps expand scientific coverage areas. It aims to raise awareness about local dolphin populations.

**Highlights:** Citizen science data collection, Marine mammal research support, Local dolphin tracking, Awareness raising, Family-friendly

**Features:** macOS Compatibility

**In-app purchases:** none


### Master

[App page](https://appshunter.io/ios/app/master-nav/id1602390396)

Learn maritime navigation rules with an interactive system designed for effective retention. This app breaks down complex regulations into manageable sections with visual aids and mnemonics. It revisits incorrect answers and provides instant graphical feedback, making the learning process intuitive and efficient.

**Highlights:** Interactive learning system, Step-by-step rule guidance, Mnemonics and memory aids, Interactive visuals, Graphical feedback on answers, Practice section with progress tracking

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

**In-app purchases:** none


## Frequently asked questions

### Is Dolphin Count free?

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

### Is Master free?

Master costs $1.99, with no in-app purchases.

### Which has better reviews, Dolphin Count or Master?

Master is rated higher. Dolphin Count averages 4.5 out of 5 from 2 ratings, while Master averages 4.7 from 94 ratings.

### Do Dolphin Count or Master have ads?

Neither Dolphin Count nor Master shows ads.

### Which is updated more often, Dolphin Count or Master?

Dolphin Count ships an update every 10 months, and Master fortnightly. Most recently, Dolphin Count was updated on June 11, 2026 and Master on September 27, 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.*