# FloodNotice vs Blue Liner Flows

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.

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.

## The numbers

| Metric | FloodNotice | Blue Liner Flows |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (11 ratings)](https://appshunter.io/ios/app/floodnotice/id6446180837/reviews)** | [4.7 (42 ratings)](https://appshunter.io/ios/app/blue-liner-flows/id6464350766/reviews) |
| Number of ratings | 11 | **42** |
| Positive reviews | **100.0% of reviews** | 64.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 4 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Nathaniel Copeland](https://appshunter.io/developer/1676503463) | [Ryan Olson](https://appshunter.io/developer/605279068) |

## What reviewers say

### FloodNotice

[App page](https://appshunter.io/ios/app/floodnotice/id6446180837)

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.

**Highlights:** Real-time streamflow observations, River level monitoring, Flood condition alerts, Streamflow forecasts, Save favorite streamgages, Coverage across 50 U.S. states and Puerto Rico

**Features:** macOS Compatibility

**In-app purchases:** none


### Blue Liner Flows

[App page](https://appshunter.io/ios/app/blue-liner-flows/id6464350766)

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.

**Highlights:** River flow data (discharge, temperature, pH), Interactive map with directions, Customizable stream tagging, Real-time condition alerts, Home screen widgets, Integrated weather forecasts

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Annual Subscription | $6.99 | per year |
| Premium Lifetime Edition | $19.99 | one-time |


## Frequently asked questions

### Is FloodNotice free?

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

### Is Blue Liner Flows free?

Blue Liner Flows is free to download, with in-app purchases available.

### Which has better reviews, FloodNotice or Blue Liner Flows?

FloodNotice is rated higher. FloodNotice averages 4.9 out of 5 from 11 ratings, while Blue Liner Flows averages 4.7 from 42 ratings.

### Do FloodNotice or Blue Liner Flows have ads?

Neither FloodNotice nor Blue Liner Flows shows ads.

### Which is updated more often, FloodNotice or Blue Liner Flows?

FloodNotice ships an update every 7 months, and Blue Liner Flows weekly. Most recently, FloodNotice was updated on November 3, 2026 and Blue Liner Flows on November 3, 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.*