# RT vs Mamori

The clearest difference is in-app purchases: Mamori at none against RT's 5. Mamori also leads on iOS requirement (13.0 vs 26.0). RT's advantage is update cadence (monthly vs every 5 months) and chart position (#200 vs unranked). On price, ads and device support there is nothing between them.

Both are free to download. RT sells 5 one-off in-app purchases. Mamori asks for nothing beyond the download.

RT ships an update monthly, Mamori every 5 months. The most recent releases landed on September 23, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | RT | Mamori |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (8 ratings)](https://appshunter.io/ios/app/rt-nav/id586307815/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 months |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#200** | — |
| Size | 13 MB | 128 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hilton's Fishing Charts, L.L.C.](https://appshunter.io/developer/586307818) | [Trackimo LLC](https://appshunter.io/developer/796838009) |

## What reviewers say

### RT

[App page](https://appshunter.io/ios/app/rt-nav/id586307815)

**Currently charting:** #200 Top Grossing · Navigation (US App Store)

Navigate using real-time oceanographic data like sea surface temperatures and currents on your mobile device. Create and edit waypoints, zoom maps, and track your GPS location for point-to-point navigation. Access dynamic maps even without cell service.

**Highlights:** Real-time oceanographic imagery, Waypoint creation and editing, Map zooming, Point-to-point navigation, Real-time GPS tracking, Offline navigation capabilities

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Day Subscription | $29.99 | one-time |
| 1 Week Subscription | $49.99 | one-time |
| 1 Month Subscription | $99.99 | one-time |
| 1 Year Subscription | $199.99 | one-time |
| One Year International | $199.99 | one-time |


### Mamori

[App page](https://appshunter.io/ios/app/mamori/id1567247692)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RT free?

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

### Is Mamori free?

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

### Do RT or Mamori have ads?

Neither RT nor Mamori shows ads.

### Which is updated more often, RT or Mamori?

RT ships an update monthly, and Mamori every 5 months. Most recently, RT was updated on September 23, 2026 and Mamori on September 10, 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.*