# EF Scale — The ultimate reference guide > Tool for assessing tornado and wind damage using the Enhanced Fujita Scale. (iPhone/iPad app by WeatherWary LLC.) - Source: https://appshunter.io/ios/app/ef-scale/id418856071 (this page in markdown: same URL + `.md`) - Developer: [WeatherWary LLC](https://appshunter.io/developer/418856074) - Category: Weather, Education - Price: Free - Rating: 4.50/5 from 4 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 26.0 · 18 MB - Languages: American English - Released: 2011-02-11 - Data updated: 2026-08-08 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/ef-scale/id418856071/reviews.md ## What is EF Scale? 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! *** ## Key features - Simplified EF Scale assessment - Damage indicator selection - Degree of damage input - Construction variability adjustment - Visual damage examples - About and share functions ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/ef-scale/id418856071/reviews.md ### 5/5 — this is really awesome!!!!!!!!!!!!! *2020-12-18* REALLY AWESOME I LOVE IT COZ I LOVE TORNADOES SO I LOOKED UP EF SCALE AND I FOUND THIS IT TELLS U THE DAMAGE THE TORNADO DOES one more thing can u update it so u a little simulation of the tornado hitting the buildings and u can select the ef form a mesocyclone-ef5 Do it in order like this weak mesocyclone/funnel,mesocyclone,funnel,ef0,ef1,ef2,ef3,ef4,Ef4/5,ef5 ### 5/5 — Amazing!! *2017-02-01* This application is honestly amazing and very helpful!!! Thank you for making this!! :D ### 3/5 — Interesting But... *2015-05-01* It's a detailed and specific analysis of tornado damage to various structures. Allows the user to determine the severity of the storm from observed damage. It's good but there are fewer actual photos or graphic illustrations in the newest update. ### 2/5 — Please! *2012-03-01* Nice app love the model destruction but HATE the real pics! So as I was looking I noticed school as one so I tap on a damage amount IT DOSNT GIVE A MODEL PLEASE MAKE EVERY STRUCTURE AND DAMAGE LEVEL INCLUDE A MODEL!!!!!!!!!!!! ### 5/5 — Worth more than the price! *2011-12-21* For those who do damage surveys this is a great find! Nice to see everything integrated into a format which fits fine on an iPhone. No need to lug a laptop around or some printouts to remind you of classification scales... ### 4/5 — Very interesting *2011-07-22* This is very informative. Great app. ### 3/5 — Pretty good *2011-05-26* Needs the photo DI database if you can do it in future update, otherwise top notch. ### 5/5 — Review *2011-02-15* Great App. Can't wait to try it out on a real storm! ### 5/5 — Easy and accurate *2011-02-15* Works well and easy to use! A must-have app to have on hand, especially if you live in tornado ally! ## Frequently asked questions about EF Scale ### What is EF Scale used for? EF Scale is used to rate tornado intensity based on the damage they cause. This app simplifies the process by guiding users through selecting damage indicators and degrees of damage to estimate wind speeds. ### Does EF Scale have ads? No, EF Scale is ad-free, providing an uninterrupted user experience for damage assessment. ### What devices does EF Scale support? EF Scale is available for iPhone, iPad, and iPod devices. ### How often is EF Scale updated? The app was last updated on November 23, 2020, with version 1.5. Previous updates included bug fixes and the addition of pictures and informational buttons. ### What is the age rating for EF Scale? EF Scale has an age rating of 4+, making it suitable for a wide range of users interested in weather phenomena. ### Can EF Scale be used for official damage surveys? No, EF Scale is strictly for reference purposes. Official damage surveys require professional knowledge and experience and are conducted by the National Weather Service and their delegates. ### What rating does EF Scale have? EF Scale has a high user rating of 4.5 stars based on 4 ratings, indicating positive user sentiment. ### Is EF Scale free to download? Yes, EF Scale is available for free download on supported Apple devices. ## Version history (last 5 releases) ### 1.6 — 2026-08-04 Updated UI ### 1.5 — 2020-11-23 Typo fixes ### 1.4 — 2015-04-28 This app has been updated by Apple to display the Apple Watch app icon. Version 1.4 Improved UI ### 1.3 — 2013-09-18 Bug fixes Improved sharing options ### 1.2 — 2011-12-20 Fixed pictures that weren't displaying correctly Added about & share buttons! ## Apps similar to EF Scale | App | Rating | Price | Category | | --- | --- | --- | --- | | [Cyanometer](https://appshunter.io/ios/app/cyanometer/id1476812898) | 2.8 (4) | $0.99 | Weather | | [Smart Sea Level Sensors](https://appshunter.io/ios/app/smart-sea-level-sensors/id1558164872) | 5.0 (3) | Free | Weather | | [White Squirrel Weather](https://appshunter.io/ios/app/white-squirrel-weather/id1276022280) | 5.0 (4) | Free | Weather | | [WorldPulsePro](https://appshunter.io/ios/app/worldpulsepro/id400514477) | 3.0 (2) | Free | Weather | | [Unity Weather](https://appshunter.io/ios/app/unity-weather/id1602147087) | 3.8 (4) | Free | Weather | | [Weather-Maps](https://appshunter.io/ios/app/weather-maps/id1584493229) | 3.3 (3) | Free | Weather | ## More apps by WeatherWary LLC - [Radar Mobile](https://appshunter.io/ios/app/radar-mobile/id446302859) - [Soundings Mobile](https://appshunter.io/ios/app/soundings-mobile/id490267314) - [Surface Weather](https://appshunter.io/ios/app/surface-weather/id558305682) - [Satellite Weather](https://appshunter.io/ios/app/satellite-weather/id642220496) All apps by WeatherWary LLC: https://appshunter.io/developer/418856074 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-08.*