# Arm Hydromet vs OBSERVER AI Weather

The clearest difference is update cadence: Arm Hydromet at every 2 weeks against OBSERVER AI Weather's every 7 months. OBSERVER AI Weather's advantage is iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

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

Arm Hydromet ships an update every 2 weeks, OBSERVER AI Weather every 7 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Arm Hydromet | OBSERVER AI Weather |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/arm-hydromet/id6478759831/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 7 months |
| Monetization | Free | — |
| Size | 18 MB | 27 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Locator CJSC](https://appshunter.io/developer/879836770) | [OBSERVER Inc.](https://appshunter.io/developer/1438098762) |

## What reviewers say

### Arm Hydromet

[App page](https://appshunter.io/ios/app/arm-hydromet/id6478759831)

Get detailed weather forecasts and information specifically for the region of Armenia. This application provides up-to-date meteorological data to help you plan your activities.

**Highlights:** Armenia-specific weather data, Detailed forecasts, Up-to-date meteorological information, Regional weather updates

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

**In-app purchases:** none


### OBSERVER AI Weather

[App page](https://appshunter.io/ios/app/observer-ai-weather/id6739279229)

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

**In-app purchases:** none


## Frequently asked questions

### Is Arm Hydromet free?

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

### Is OBSERVER AI Weather free?

OBSERVER AI Weather is free to download, with no in-app purchases.

### Do Arm Hydromet or OBSERVER AI Weather have ads?

Neither Arm Hydromet nor OBSERVER AI Weather shows ads.

### Which is updated more often, Arm Hydromet or OBSERVER AI Weather?

Arm Hydromet ships an update every 2 weeks, and OBSERVER AI Weather every 7 months. Most recently, Arm Hydromet was updated on November 4, 2026 and OBSERVER AI Weather on October 30, 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.*