EF Scale vs Tempest Weather
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EF Scale
Assess tornado and wind damage with this tool that simplifies the Enhanced Fujita (EF) Scale. Follow on-screen prompts to select damage indicators and degrees of damage, then adjust for construction variability to estimate wind speeds.
- Simplified EF Scale assessment
- Damage indicator selection
- Degree of damage input
- Construction variability adjustment
- Visual damage examples
- About and share functions
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Rate tornado damage the way surveyors do. EF Scale puts the complete Enhanced Fujita scale on your iPhone, iPad, and Mac — all 28 damage indicators, every degree of damage, and the expected wind speeds behind each rating. Browse structure types from small barns and family residences to high-rise buildings, transmission lines, and trees. Compare what you see against reference photos and construction details, then pick a degree of damage and tune the wind speed estimate between its bounds to account for construction quality. • All 28 damage indicators of the Enhanced Fujita scale • Reference photos and construction details for every indicator • Degrees of damage with expected wind speeds and EF ratings • Interactive wind speed estimator with adjustable bounds • EF0–EF5 rating reference, always a tap away • Everything stored on device — works fully offline in the field Built for storm spotters, damage surveyors, emergency managers, students, and weather enthusiasts. *** PLEASE REMEMBER: This app is for reference purposes only. Doing a real damage survey takes knowledge and experience you can't build into an app! Official damage assessments are the business of the National Weather Service and their delegates! ***
Tempest Weather
This app connects to a proprietary weather sensor to provide real-time local weather data, lightning and rain alerts, and highly accurate forecasts. It integrates with smart home devices for optimized energy and water usage, and offers customizable data sharing.
- Real-time weather conditions
- Lightning and rain alerts
- Accurate 10-day forecast
- Smart home integration
- Historical weather data
- Customizable data sharing
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This app requires the Tempest sensor device, which is available to buy separately. Need to set up and configure your Tempest Weather System? The Tempest app will walk you through a few simple steps, including connecting your home’s WiFi network. Once you’re up and running the app will quickly become your go-to for real-time weather conditions, lightning and rain alerts, and the most accurate forecast for your location - guaranteed. Data available in the Tempest app includes: Temp, humidity, dew point, feels like, heat index Barometric pressure, sea-level pressure, trends Lightning detection and alerts up to 40 km Wind, UV, solar irradiance Rain rate, accumulation, rain onset alerts 10-day forecast Historical weather data graphs Smart Home Ready: Use this app to save time, energy, and water by integrating with popular smart home and irrigation services. Use your weather data to optimize heating and cooling, adjust your irrigation schedule, and alert your family when lightning storms approach. Tempest is compatible with Google Assistant, Rachio, IFTTT, Siri, Alexa, Homey, and many more. Weather Geek Worthy: The Tempest device features an all-in-one sensor and long-range wireless connectivity (1000ft), sonic anemometer, and haptic rain sensor, but it is far more than just a cutting-edge piece of hardware. Each Tempest leverages WeatherFlow-Tempest’s patented Nearcast Technology™, which feeds real-time observed weather data from your backyard into a machine learning system to dramatically improve forecast accuracy where it matters most. Completely Customizable: Tempest’s open API and shareable data enable third-party use, with built-in publication to desktop software and online services.
Screenshots
Verdict
The clearest difference is rating: EF Scale at 4.5 against Tempest Weather's 4.0. Tempest Weather's advantage is update cadence (every 3 weeks vs every 20 months) and ratings volume (493 vs 4). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
EF Scale holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Tempest Weather has 493 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 67% of EF Scale's written reviews are positive against 60% of Tempest Weather's.
EF Scale ships an update every 20 months, Tempest Weather every 3 weeks. The most recent releases landed on October 4, 2026 and October 17, 2026 respectively.
| Parameter | EF Scale | Tempest Weather |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (4 ratings) — better | 4.0 (493 ratings) |
| Positive reviews | 66.7% of reviews — better | 60.4% of reviews |
| Number of ratings | 4 | 493 — better |
| Update frequency | Every 20 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | — | #80 — better |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 26.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 18 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | WeatherWary LLC | WeatherFlow |
Customer experience
EF Scale
Tempest Weather
Bugs and requests
EF Scale
Not enough reviews yet to summarise bugs or requests.
Tempest Weather
Reported bugs
4 issues- App freezes on launch
- Widgets stop working after updates
- Complications not updating on Apple Watch
- Location detection issues
Requested features
7 requests- Add dark mode
- Improve graph visualization
- Integrate with smart home platforms
- Add more weather data points
- Improve notification settings
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- Add Apple TV app
- Provide more localization options
In-app purchases
EF Scale
No in-app purchases
Tempest Weather
No in-app purchases
Questions
Is EF Scale free?
Is Tempest Weather free?
Which has better reviews, EF Scale or Tempest Weather?
Do EF Scale or Tempest Weather have ads?
Which is updated more often, EF Scale or Tempest Weather?
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