Blue Liner Flows vs LastDrop
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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/
LastDrop
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LastDrop lets you track the fill levels of freshwater resources — dams, lakes, rivers, and aquifers — around the world in real time. KEY FEATURES • Interactive Map — View 65+ water sources across 9 countries with color-coded pins. Blue means healthy, yellow is a warning, red indicates critical levels. • Animated Fill Gauge — Visualize each water source's fill percentage with a live wave animation. • Detailed Information — Capacity, current water level, 12-month trend chart, and data source attribution. • Favorites — Add important water sources to your favorites for quick access. • Comparison — Compare up to 3 water sources side by side to easily spot differences. • Smart Search — Filter by region, type, or status. • Instant Notifications — Receive automatic alerts when your favorite sources drop to critical levels. • Offline Access — View previously loaded data even without an internet connection. • Dark/Light Theme — Adapts to your device settings or choose manually. • Turkish & English — Full support in both languages. DATA SOURCES Data is updated every 6 hours from official sources including Turkey (ISKI, DSI, ASKI, IZSU, BUSKI), USA (USBR, CDEC, USGS), Spain (SAIH), Australia (WaterNSW), South Africa (DWS), Brazil (ANA), India (CWC), Egypt (MWRI), and China (MWR). Stay informed about water resources. Make conscious decisions.
Screenshots
Verdict
The clearest difference is in-app purchases: LastDrop at none against Blue Liner Flows's 2. LastDrop also leads on iOS requirement (15.1 vs 17.6). Blue Liner Flows's advantage is update cadence (weekly vs every 3 months) and chart position (#191 vs unranked). On price, 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. LastDrop asks for nothing beyond the download.
Blue Liner Flows ships an update weekly, LastDrop every 3 months. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.
| Parameter | Blue Liner Flows | LastDrop |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (42 ratings) — better | — |
| Positive reviews | 64.3% of reviews | — |
| Number of ratings | 42 — better | — |
| Update frequency | Weekly — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #191 — better | — |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 4 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryan Olson | Alper Emin Yardimci |
In-app purchases
Blue Liner Flows
- Premium Annual Subscription7 Days trial$6.991 Year
- Premium Lifetime Edition$19.99
LastDrop
No in-app purchases








