# ARMAS vs River Levels & Flows

The clearest difference is price: ARMAS at Free against River Levels & Flows's $2.99. ARMAS also leads on review sentiment (100% vs 59%). River Levels & Flows's advantage is in-app purchases (none vs 3) and ratings volume (2.6K vs 6). On update cadence, ads, device support and iOS requirement there is nothing between them.

ARMAS is free to download; River Levels & Flows costs $2.99 up front. ARMAS sells 3 in-app purchases, starting at $2.99 per year. River Levels & Flows asks for nothing beyond the download.

River Levels & Flows holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: River Levels & Flows has 2.6K ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 100% of ARMAS's written reviews are positive against 59% of River Levels & Flows's, so the app with the better star average is not the one people write more warmly about.

ARMAS ships an update every 2 months, River Levels & Flows every 3 months. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | ARMAS | River Levels & Flows |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.3 (6 ratings)](https://appshunter.io/ios/app/armas/id1446097782/reviews) | **[4.6 (2.6K ratings)](https://appshunter.io/ios/app/river-levels-and-flows/id1508808963/reviews)** |
| Number of ratings | 6 | **2.6K** |
| Positive reviews | **100.0% of reviews** | 59.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | — | **#33** |
| Size | 38 MB | 29 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Space Environment Technologies, LLC.](https://appshunter.io/developer/1446097781) | [LW Brands, LLC](https://appshunter.io/developer/963599018) |

## What reviewers say

### ARMAS

[App page](https://appshunter.io/ios/app/armas/id1446097782)

Real-time radiation monitoring for aviation and space weather awareness. Pairs with hardware detectors or provides data from global systems for pilots and travelers.

**Highlights:** Real-time radiation monitoring, Space weather awareness, Pairs with ARMAS Flight Modules, Detects various radiation types, Global airspace coverage, Data from ground and space systems

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premier | $2.99 | per year |
| Professional | $2.99 | per year |
| Member | $2.99 | one-time |


### River Levels & Flows

[App page](https://appshunter.io/ios/app/river-levels-and-flows/id1508808963)

**Currently charting:** #33 Top Paid · Weather (US App Store)

Access real-time USGS and AHPS river level and flow data. Receive push notifications for flood status and view weather prediction charts for significant river flood outlooks and precipitation forecasts.

**Highlights:** USGS/AHPS river levels and flows, Flood status push notifications, Weather Prediction Center charts, Interactive gauge map, Gauge history and statistics, Quantitative precipitation forecasts

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Landscape mode for iPads
- 🚀 Excellent customer support
- 📊 Impressive data visualization
- 🔍 Useful for monitoring river levels
- 🔔 Helpful push notification feature

**What reviewers complain about**

- 🔍 Limited gauge coverage
- 🔢 Lack of customization options
- 📊 Inaccurate or outdated data
- 🤔 Overly complex for basic usage
- 💰 Poor value for the price

**Reported bugs**

- Saved gauges disappearing
- Inability to add desired gauge stations

**Requested features**

- Add more river gauge stations
- Allow sorting and organizing of favorite gauges
- Provide option to switch between USGS and NOAA data
- Implement customizable alert thresholds
- Add water temperature data


## Frequently asked questions

### Is ARMAS free?

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

### Is River Levels & Flows free?

River Levels & Flows costs $2.99, with no in-app purchases.

### Which has better reviews, ARMAS or River Levels & Flows?

River Levels & Flows is rated higher. ARMAS averages 4.3 out of 5 from 6 ratings, while River Levels & Flows averages 4.6 from 2.6K ratings.

### Do ARMAS or River Levels & Flows have ads?

Neither ARMAS nor River Levels & Flows shows ads.

### Which is updated more often, ARMAS or River Levels & Flows?

ARMAS ships an update every 2 months, and River Levels & Flows every 3 months. Most recently, ARMAS was updated on October 24, 2026 and River Levels & Flows on October 26, 2026.

---

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