# Marées vs RiverAlert

The clearest difference is review sentiment: RiverAlert at 100% against Marées's 6%. RiverAlert also leads on price (Free vs $1.99). Marées's advantage is iOS requirement (12.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

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

Marées ships an update every 3 weeks, RiverAlert every 2 weeks. The most recent releases landed on October 9, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Marées | RiverAlert |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/marees/id1636112325/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 6.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 54 MB | 41 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Christian Guine](https://appshunter.io/developer/1636112507) | [P&F innvoations](https://appshunter.io/developer/1868216054) |

## What reviewers say

### Marées

[App page](https://appshunter.io/ios/app/marees/id1636112325)

Provides tide schedules, heights, and coefficients for over 150 French ports and some British ports. It operates autonomously, requiring internet only for updates and maps, and does not use geolocation data outside the app.

**Highlights:** Tide schedules for 150+ French ports, Tide data for British ports, Harmonic constants from Previ Mer, Autonomous operation, Customizable tide height thresholds, Local time display (summer/winter)

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

**In-app purchases:** none


### RiverAlert

[App page](https://appshunter.io/ios/app/riveralert/id6757677454)

Stay informed about French river levels in real-time. Get instant alerts for dangerous water variations and access safety features like emergency contacts and pollution reporting. Enhance your outdoor experience with detailed river data and community safety tools.

**Highlights:** Real-time river level monitoring, Instant dangerous water level alerts, Favorite river station selection, Emergency contact buttons (112), Pollution reporting with geolocation, Integrated IGN map with user proximity, Catch log with photos and conditions

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

**In-app purchases:** none


## Frequently asked questions

### Is Marées free?

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

### Is RiverAlert free?

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

### Do Marées or RiverAlert have ads?

Neither Marées nor RiverAlert shows ads.

### Which is updated more often, Marées or RiverAlert?

Marées ships an update every 3 weeks, and RiverAlert every 2 weeks. Most recently, Marées was updated on October 9, 2026 and RiverAlert on October 13, 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.*