FloodNotice vs Blue Liner Flows
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FloodNotice
Access real-time streamflow, river levels, and flood forecasts from over 6,000 locations across the U.S. Save your favorite streamgages for quick access to critical waterbody information.
- Real-time streamflow observations
- River level monitoring
- Flood condition alerts
- Streamflow forecasts
- Save favorite streamgages
- Coverage across 50 U.S. states and Puerto Rico
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FloodNotice, the streamlined way to view real-time streamflow observations, river levels, and flood conditions, along with streamflow forecasts published by the National Weather Service's National Water Prediction Service (NWPS). Mark your favorite streamgages for easy access when heading out to your favorite waterbody. Highlights: - View stream/river conditions and forecasts from over 6,000 streamgages - Covers all 50 U.S. states and Puerto Rico - Save favorite streamgages for quick reference
Blue Liner Flows
Access detailed USGS and NOAA river flow data, including discharge, temperature, and gauge height. Explore rivers with an interactive map, set custom tags for organization, and receive alerts for condition changes. Plan your outdoor activities with integrated weather forecasts.
- River flow data (discharge, temperature, pH)
- Interactive map with directions
- Customizable stream tagging
- Real-time condition alerts
- Home screen widgets
- Integrated weather forecasts
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With Blue Liner Flows, you are only one click away from easy access to detailed and comprehensible river flow information. With data aggregated from both the USGS and NOAA, parameters such as discharge, temperature, turbidity, dissolved oxygen, pH, and gauge height are available for thousands of rivers and streams across the U.S. This simple and easy-to-use app offers endless searching and viewing options, allowing you to effortlessly check in with your favorite streams. And, with an interactive map embedded within the interface, exploring and gaining directions to new rivers has never been made easier. Blue Liner Flows also gives you the ability to categorize any watershed into your own set of personalized tags, making organization a breeze. These features and many more can be available to you and have never been more accessible. - Set up alerts to be directly notified when river conditions change. - Use widgets to gain practical flow information at a glance directly from your Home Screen, Lock Screen, or Today View. - Organize streams under your own array of fully customizable tags. - Along with NOAA river forecasts, use detailed weather information such as barometric pressure, cloud cover, and more to plan your day on the water. - Useful for any activity on the river, whether it be fishing, rafting, kayaking, boating, or even swimming! All river gauge information is provided by the USGS and NOAA. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
FloodNotice and Blue Liner Flows both sit at 4.9 stars, but that hides the real split: 100% of FloodNotice's written reviews are positive against 64% of Blue Liner Flows's. FloodNotice also leads on in-app purchases (none vs 2). Blue Liner Flows's advantage is update cadence (weekly vs every 7 months) and ratings volume (42 vs 11). On price, rating, ads and device support 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
Both are free to download. Blue Liner Flows sells 2 in-app purchases, starting at $6.99 per year. FloodNotice asks for nothing beyond the download.
FloodNotice holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 11 and 42 respectively. Written reviews point the same way: 100% of FloodNotice's written reviews are positive against 64% of Blue Liner Flows's.
FloodNotice ships an update every 7 months, Blue Liner Flows weekly. Both last shipped on November 3, 2026.
| Parameter | FloodNotice | Blue Liner Flows |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (11 ratings) — better | 4.7 (42 ratings) |
| Positive reviews | 100.0% of reviews — better | 64.3% of reviews |
| Number of ratings | 11 | 42 — better |
| Update frequency | Every 7 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, Mac — better |
| Requires iOS | 17.6 | 17.6 |
| Further details — not scored | ||
| Size | 10 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Nathaniel Copeland | Ryan Olson |
Customer experience
FloodNotice
Blue Liner Flows
In-app purchases
FloodNotice
No in-app purchases
Blue Liner Flows
- Premium Annual Subscription7 Days trial$6.991 Year
- Premium Lifetime Edition$19.99






