ARMAS vs River Levels & Flows
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ARMAS
Real-time radiation monitoring for aviation and space weather awareness. Pairs with hardware detectors or provides data from global systems for pilots and travelers.
- 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
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The Automated Radiation Measurements for Aerospace Safety (ARMAS) program has been developed with NASA funding. It provides accurate, real-time radiation monitoring along with radiation and space weather awareness for the global airspace up to 100 km altitude. The ARMAS app is part of this program and does two tasks: - it pairs with and controls the 7th generation ARMAS Flight Module (FM7) and the 12th generation ARMAS Flight Module (FM12) radiation detector (purchased separately) to provide the highest quality, real-time dose and dose rates in aircraft and suborbital vehicles. It is sensitive to radiation from all sources including heavy ions, alphas, protons, neutrons, electrons, and gamma-rays. - it provides radiation awareness by hosting real-time space weather data coming from dozens of ground- and space-based systems that report all the information relevant to radiation processes without requiring a purchase of the FM7 or FM12. ARMAS is the 'gold-standard' in real-time radiation monitoring and awareness used by professional pilots, business travelers, and commercial space tourists. The ARMAS program is developed and operated by Space Environment Technologies, which specializes in space weather as an official NOAA "Weather Ready Nation" Ambassador.
River Levels & Flows
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.
- USGS/AHPS river levels and flows
- Flood status push notifications
- Weather Prediction Center charts
- Interactive gauge map
- Gauge history and statistics
- Quantitative precipitation forecasts
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Main Features Include: + USGS / AHPS River Levels & Flows + Gauge Flood Status Push Notifications + Weather Prediction Center Charts Interactive USGS / AHPS Gauge Map The USGS maintains a national network of stream gauges that provide hydrological observations. In addition, AHPS collects real-time water level information from other federal, state, and local stream gauge networks. USGS / AHPS Hydrological Data Includes: + Water Level & Flow Observations + Gauge Levels, Flows & Volume Forecast + Gauge History & Statistics + Flood Status Push Notifications Weather Prediction Center Charts + Significant River Flood Outlook + Quantitative Precipitation Forecasts + Excessive Rainfall Outlook + U.S Hazards Outlook + Risk of Heavy Precipitation Enjoy!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ARMAS | River Levels & Flows |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.3 (6 ratings) | 4.6 (2.6K ratings) — better |
| Positive reviews | 100.0% of reviews — better | 59.2% of reviews |
| Number of ratings | 6 | 2.6K — better |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | — | #29 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 38 MB | 29 MB |
| Age rating | 4+ | 12+ |
| Developer | Space Environment Technologies, LLC. | LW Brands, LLC |
Customer experience
ARMAS
River Levels & Flows
Bugs and requests
ARMAS
Not enough reviews yet to summarise bugs or requests.
River Levels & Flows
Reported bugs
2 issues- Saved gauges disappearing
- Inability to add desired gauge stations
Requested features
5 requests- 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
In-app purchases
ARMAS
- Premier$2.991 Year
- Professional$2.991 Year
- Member$2.99
River Levels & Flows
No in-app purchases
