Comparison

EF Scale vs Tempest Weather

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Simplified EF Scale assessment
  • Damage indicator selection
  • Degree of damage input
  • Construction variability adjustment
  • Visual damage examples
  • About and share functions
Features
Read full description

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! ***

About

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.

Highlights
  • Real-time weather conditions
  • Lightning and rain alerts
  • Accurate 10-day forecast
  • Smart home integration
  • Historical weather data
  • Customizable data sharing
Features
Currently charting
Read full description

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

EF Scale4 screens
Tempest Weather4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 6 level
EF Scale versus Tempest Weather: the parameters behind the verdict, then further details
ParameterEF ScaleTempest Weather
PriceFreeFree
Rating4.5 (4 ratings) — better4.0 (493 ratings)
Positive reviews66.7% of reviews — better60.4% of reviews
Number of ratings4493 — better
Update frequencyEvery 20 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
Best chart rank—#80 — better
DevicesiPhone, iPad, MaciPhone, iPad, iPod, Apple Watch — better
Requires iOS26.013.0 — better
Further details — not scored
Size18 MB44 MB
Age rating4+4+
DeveloperWeatherWary LLCWeatherFlow

Customer experience

EF Scale

All ratings4 ratings
Positive75.0%
Neutral25.0%
Negative0.0%
Written reviews9 reviews
Positive66.7%
Neutral22.2%
Negative11.1%

Tempest Weather

All ratings493 ratings
Positive72.6%
Neutral11.6%
Negative15.8%
Written reviews197 reviews
Positive60.4%
Neutral15.7%
Negative23.9%

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
Show 2 more
  • Add Apple TV app
  • Provide more localization options

In-app purchases

None

EF Scale

No in-app purchases

None

Tempest Weather

No in-app purchases

Questions

Is EF Scale free?
EF Scale is free to download, with no in-app purchases.
Is Tempest Weather free?
Tempest Weather is free to download, with no in-app purchases.
Which has better reviews, EF Scale or Tempest Weather?
EF Scale is rated higher. EF Scale averages 4.5 out of 5 from 4 ratings, while Tempest Weather averages 4.0 from 493 ratings.
Do EF Scale or Tempest Weather have ads?
Neither EF Scale nor Tempest Weather shows ads.
Which is updated more often, EF Scale or Tempest Weather?
EF Scale ships an update every 20 months, and Tempest Weather every 3 weeks. Most recently, EF Scale was updated on October 4, 2026 and Tempest Weather on October 17, 2026.

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