SML+ vs Seattle Lakes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SML+
Stay informed about Smith Mountain Lake with real-time water levels, temperature, wind forecasts, and marine gas prices. Get alerts, track the ice cream boat, and view historical data for a better lake experience.
- Real-time water level updates
- Hourly water temperature readings
- Interactive temperature sensor map
- Historical water level and temperature charts
- Marine gas prices and locations
- 5-day wind forecast
- Water level and safety alerts
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Worried about flooding at the lake? Wondering how water levels are changing or how fast water is flowing? Curious about the current water temperature? Interested in alerts specific to SML? Or maybe you just want to track the SML Ice Cream Boat or Hotdog Boat. Whatever brings you to the lake, this app is for you — whether you visit, live on, or boat at Smith Mountain Lake and want water level, water temp, water flow, wind forecast, or map information at your fingertips. SML+ is the ONLY app that includes: - Water level measurements for SML and Leesville, updated every 10 minutes - Water temperature updated hourly from 9 sensors across 7 locations around the lake - Smith Mountain Project Inflow/Outflow from USGS gauges - Customizable date ranges for water level, water temp, and flow trends - Comprehensive map showing marine gas, water temp, restaurants, food boats, and attractions - 5-day wind forecast with speed, gust, and direction - Contextual average water level that adapts to the range you're viewing - Color-coded water level status at a glance - Tap any point on a chart for the exact reading at that moment - Water level and safety alerts
Seattle Lakes
Access real-time and historical lake temperature data for Lake Washington and Lake Sammamish. Plan your outdoor activities with confidence using accurate, up-to-date information and enjoy visually appealing Pacific Northwest-themed backgrounds.
- Real-time lake temperature readings
- All-time record high and low temperatures
- Current month's record highs and lows
- Customizable temperature units (Fahrenheit/Celsius)
- Dynamic background images
- Supports Lake Washington, Lake Sammamish, and Lake Union
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King County Lake Temperatures is your go-to app for real-time lake temperature data in King County, Washington. With a user-friendly interface and a wealth of information at your fingertips, you can plan your activities on Lake Washington or Lake Sammamish with confidence. Key Features: Real-Time Lake Temperatures: Get the most up-to-date temperature readings from Lake Washington and Lake Sammamish . Our data is sourced directly from reliable sensors run by King County, ensuring you have the most accurate information possible. View the all-time record high and low, and the current months' all-time record high and low, for Lake Washington, Lake Sammamish, and Lake Union. Background images of the Pacific Northwest change depending on the time of day and season. Customizable Settings: Choose your favorite lake, and whether you want temperatures displayed in Fahrenheit or Celsius. Whether you're a swimmer, boater, fisher, or just a nature lover, King County Lake Temperatures is the perfect companion for your lake adventures. Download today and start exploring!
Screenshots
Verdict
The clearest difference is price: SML+ at Free against Seattle Lakes's $1.99. SML+ also leads on update cadence (every 2 months vs every 19 months) and ratings volume (47 vs 2). Seattle Lakes's advantage is chart position (#188 vs unranked) and iOS requirement (13.0 vs 15.6). On rating, review sentiment, ads and in-app purchases 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
SML+ is free to download; Seattle Lakes costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for SML+ against 5.0 for Seattle Lakes. That said, the two scores are not equally well evidenced: SML+ has 47 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.
SML+ ships an update every 2 months, Seattle Lakes every 19 months. The most recent releases landed on August 22, 2026 and August 11, 2026 respectively.
| Parameter | SML+ | Seattle Lakes |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 5.0 (47 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 47 — better | 2 |
| Update frequency | Every 2 months — better | Every 19 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Best chart rank | — | #188 — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Timothy Barr | Ten Moments |
Customer experience
SML+
Seattle Lakes
In-app purchases
SML+
No in-app purchases
Seattle Lakes
No in-app purchases









