# PAM vs Estai

The clearest difference is iOS requirement: PAM at 13.0 against Estai's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PAM ships an update monthly, Estai every 2 months. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | PAM | Estai |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free | — |
| Size | 34 MB | 59 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Centro de Hidrografia da Marinha](https://appshunter.io/developer/1532680426) | [Leonardo Rodrigues Fonseca de Souza](https://appshunter.io/developer/1823358473) |

## What reviewers say

### PAM

[App page](https://appshunter.io/ios/app/pam/id6443572659)

Access marine environmental forecasts and various naval hydrography products with a single tap. Get real-time weather warnings, marine meteorology, meteograms, tide forecasts, synoptic charts, and weather analysis.

**Highlights:** Marine environmental forecasts, Weather warnings, Marine meteorology, Tide forecasts, Synoptic charts, Weather analysis

**Features:** Vision Pro support

**In-app purchases:** none


### Estai

[App page](https://appshunter.io/ios/app/estai/id6757098818)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is PAM free?

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

### Is Estai free?

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

### Do PAM or Estai have ads?

Neither PAM nor Estai shows ads.

### Which is updated more often, PAM or Estai?

PAM ships an update monthly, and Estai every 2 months. Most recently, PAM was updated on October 6, 2026 and Estai on October 7, 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.*