# Tide Charts vs Avisos@IPMA

The clearest difference is review sentiment: Tide Charts at 69% against Avisos@IPMA's 0%. Tide Charts also leads on rating (4.8 vs 1.0) and ratings volume (115K vs 1). Avisos@IPMA's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Tide Charts sells 1 one-off in-app purchase. Avisos@IPMA asks for nothing beyond the download.

Tide Charts holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: Tide Charts has 115K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 69% of Tide Charts's written reviews are positive against 0% of Avisos@IPMA's.

Both ship on a similar rhythm, roughly every 3 weeks. Both last shipped on November 11, 2026.

## The numbers

| Metric | Tide Charts | Avisos@IPMA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (115K ratings)](https://appshunter.io/ios/app/tide-charts/id957143504/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/avisosipma/id1479684716/reviews) |
| Number of ratings | **115K** | 1 |
| Positive reviews | **68.9% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#36** | — |
| Size | 104 MB | 12 MB |
| Requires iOS | **15.1** | 15.4 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [7th Gear](https://appshunter.io/developer/321178305) | [Gisgeo Information Systems, LDA](https://appshunter.io/developer/1045067469) |

## What reviewers say

### Tide Charts

[App page](https://appshunter.io/ios/app/tide-charts/id957143504)

**Currently charting:** #36 Top Free · Weather (US App Store)

Access worldwide tidal estimates, lunar data, and weather forecasts. Plan outdoor adventures with ease using current radar and offline predictions. Supports Apple Watch and includes a Today Extension for quick access.

**Highlights:** Worldwide tidal estimates, Lunar data, Weather forecast, Current radar, Offline predictions, Favorite station management, Apple Watch support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 🚀 Clear tide information
- 👍 Useful for planning activities
- 💡 Comprehensive data including weather and moon phases
- 🤖 Accurate and reliable
- 🌟 Great app for Apple Watch

**What reviewers complain about**

- 🐛 Inaccurate tide data in some locations
- 🙈 Intrusive and unskippable ads
- 🤯 Ads crashing the app
- 🤔 Confusing UI and navigation
- 🤖 Unreliable Apple Watch complications

**Reported bugs**

- Tide data off by several hours
- Tide graph not displaying correctly
- App crashing on ad dismissal
- Apple Watch complications freezing

**Requested features**

- Ability to set custom locations
- Improved accuracy and data sources
- Option to purchase ad-free version
- Landscape mode support
- More detailed tide height information


### Avisos@IPMA

[App page](https://appshunter.io/ios/app/avisosipma/id1479684716)

Receive real-time weather alerts for potentially hazardous conditions up to 72 hours in advance. The app displays warnings issued by the Portuguese Institute for Sea and Atmosphere, categorized by intensity with a color-coded system.

**Highlights:** Weather risk alerts, 72-hour forecast, District-level warnings, Color-coded intensity, Multiple weather phenomena

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

**In-app purchases:** none


## Frequently asked questions

### Is Tide Charts free?

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

### Is Avisos@IPMA free?

Avisos@IPMA is free to download, with no in-app purchases.

### Which has better reviews, Tide Charts or Avisos@IPMA?

Tide Charts is rated higher. Tide Charts averages 4.8 out of 5 from 115K ratings, while Avisos@IPMA averages 1.0 from 1 ratings.

### Do Tide Charts or Avisos@IPMA have ads?

Tide Charts shows ads; Avisos@IPMA does not.

### Which is updated more often, Tide Charts or Avisos@IPMA?

Tide Charts ships an update every 3 weeks, and Avisos@IPMA every 3 weeks. Most recently, Tide Charts was updated on November 11, 2026 and Avisos@IPMA on November 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*