Storm Shield vs CASA Alerts
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Storm Shield
Receive precise, location-based severe weather alerts for tornadoes, hurricanes, floods, and more. Get voice and push notifications, view radar maps, and access forecasts. Optional premium features offer advanced radar imagery and lightning alerts.
- Location-based severe weather alerts
- Voice and push notifications
- Hi-Def radar map
- Today screen widget
- Apple Watch alerts
- Current conditions and forecasts
- Save additional locations
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Named by Time.com's @Techland as one of the best weather apps for your iPhone and Apple Watch. Severe weather alerts for your exact location. Storm Shield gives you storm-based alerts for tornado, hurricane, flood, thunderstorm, winter storms and other life-threatening weather events via voice and push notification. Storm-based alerts help reduce false alarms by alerting you to severe weather based on your exact location within a county. County-based alerts can result in false alarms, warning you when your location in the county is not within the threatened area. What people are saying: • Storm Shield "alerted our family of the Broken Arrow, OK tornado, faster than the TV and tornado sirens." - Robyn • "I was in Oklahoma City during the tornado... we were right in its path. Your app literally was a life saver." - dcalk12 Benefits: • Get voice alerts just like a NOAA weather radio via push notification anywhere in the United States. • With Apple Watch, get a tap on your wrist when alerts are issued for your locations. • Add Storm Shield's widget to your Today screen to get quick access to active alerts for the first location in your app. • Touch Storm Shield's app icon on your 3D-Touch enabled iPhone for widget access. • Hi-Def radar map is your home screen so you can quickly see what's going on at your locations. • Fully supports Dark Mode in iOS 13. • Long-tap on the map to get current conditions, hourly and daily forecasts. • Save additional locations to ensure family members stay safe. View NOAA severe weather alerts on the map to see where dangerous weather is happening: • Tap alerts to view info • Flood watches & warnings • Tornadoes & Thunderstorms • Hurricane & Tropical Storm forecast tracks • Winter storms • Marine & Coastal alerts • Radar & Clouds • Wind Speed • Snow Fall • Water Temperatures • Road Weather • Premium Weather (purchase required) • Lightning Alerts and notifications (purchase required) Enhance your app with auto-renewing monthly subscriptions: • Buy 'Premium Weather' to unlock these features and see predicted imagery for these map layers: 1) Future Radar 2) Future Clouds 3) Future Clouds & Radar together 4) Future Surface Temperature Land 5) Future Surface Temperature Water 6) Future Surface Temperature Land & Water together 7) Future Wind Speeds Map 8) Storm Tracks: See how fast storms are moving & where they're headed. • Buy 'Lightning' to unlock these 2 features: 1) Lightning strike push notifications up to 10 miles away. 2) See lightning on the map within 100 miles of a selected location. Note: • Payment will be charged to your iTunes Account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. • Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. • No cancellation of the current subscription is allowed during active subscription period. • Privacy Policy: https://www.stormshieldapp.com/privacy_stormshield_wxs.html • Terms of Use: https://www.stormshieldapp.com/terms_stormshield_wxs.html • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Storm Shield is made possible by The E.W. Scripps Company & KNXV Phoenix, WCPO Cincinnati, WEWS Cleveland, WXYZ Detroit, WMAR Baltimore, WFTS Tampa, WPTV West Palm, KSHB Kansas City, KJRH Tulsa, RTV6 Indianapolis, KMGH Denver, KGTV San Diego, KERO Bakersfield, WKBW Buffalo, WTVF Nashville, KMTV Omaha, WSYM Lansing, WFTX Ft. Myers, WTMJ Milwaukee, WGBA Green Bay, KIVI Boise, KTNV Las Vegas, KGUN Tucson, WTXL Tallahassee, KXXV Waco, KRIS Corpus Christi. Note: Continued use of GPS running in the background can dramatically decrease battery life.
CASA Alerts
This app provides severe weather forecasts and warnings, tailored to user preferences and locations. It also collects feedback through surveys to improve weather information delivery methods.
- Context-aware severe weather forecasts
- Hyper-local severe weather alerts
- Customizable alert preferences
- User feedback surveys
- Detailed radar data integration
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CASA Alerts is a multi-purpose mobile app developed by the CASA Engineering Research Center (http://www.casa.umass.edu/main/research/urbantestbed/research/), led by the University of Massachusetts Amherst, aimed at improving user-centric, context-aware severe weather forecasts and warnings using CASA’s City Warn™ platform. The CASA Alerts Mobile app delivers weather information and/or surveys to users on mobile phones to improve our understanding of the best ways to deliver weather information for thunderstorms, tornados, hail, high winds and floods. App functionality and user experience varies depending on the user. · CASA WX users: CASA collaborates with the North Central Texas Council of Governments and the National Weather Service to bring detailed, rapidly updating radar data to North Central Texas through the CASA WX program. Cities and towns that support CASA WX receive severe weather warnings issued by the National Weather Service, hyper-local alerts derived from CASA radar data, Understory sensors, and local storm spotter reports, based on user preferences for alerting, and locations of interest. We periodically request feedback from users in the form of mobile phone surveys. · Other users: These participants receive surveys that explore individual’s perceptions of severe weather risks. Different users may receive different types of weather information, and some may not receive any weather information at all so we can learn about what people currently use for severe weather information. About us: CASA’s work has been supported through various National Science Foundation grants such as Hazards SEES (#1331572), Building innovation Capacity (#1632193), FIA-NP, FIA (#1345300, #1040781) programs. Academic participants include University of Massachusetts, Colorado State University and the University of Delaware. If you have questions about the CASA Alerts app, please contact: support@casaalert.org Continued use of GPS running in the background can dramatically decrease battery life.
Screenshots
Verdict
The clearest difference is rating: Storm Shield at 4.8 against CASA Alerts's 3.5. Storm Shield also leads on update cadence (weekly vs every 2 months) and ratings volume (111K vs 10). CASA Alerts's advantage is in-app purchases (none vs 7) and ads (none vs shown). On price 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. Storm Shield sells 7 in-app purchases, starting at $1.99 per 7 days. CASA Alerts asks for nothing beyond the download.
Storm Shield holds the better App Store score, 4.8 against 3.5. That said, the two scores are not equally well evidenced: Storm Shield has 111K ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 38% of Storm Shield's written reviews are positive against 25% of CASA Alerts's.
Storm Shield ships an update weekly, CASA Alerts every 2 months. The most recent releases landed on September 27, 2026 and June 19, 2026 respectively.
| Parameter | Storm Shield | CASA Alerts |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (111K ratings) — better | 3.5 (10 ratings) |
| Positive reviews | 37.6% of reviews — better | 25.0% of reviews |
| Number of ratings | 111K — better | 10 |
| Update frequency | Weekly — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #18 — better | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.3 — better |
| Further details — not scored | ||
| Size | 91 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Mosaic S.r.l. | University of Massachusetts at Amherst |
Customer experience
Storm Shield
CASA Alerts
Bugs and requests
Storm Shield
Reported bugs
3 issues- Inconsistent alert delivery
- Radar map not always showing correct location
- Subscription features not working as expected
Requested features
5 requests- Ability to read alert details in notifications
- Option to silence alerts during certain times
- More customization for alert types and locations
- Horizontal radar view with manual scrolling
- Integration with smart home devices for alerts
CASA Alerts
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Storm Shield
- Weekly Subscription$1.997 Days
- Weekly with Free Trial7 Days trial$1.997 Days
- Premium Weather$10.991 Month
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- Lightning Strikes$10.991 Month
- 30-Day Limited Offer Upgrade1 Month trial$11.491 Month
- Yearly with Free Trial7 Days trial$29.991 Year
- Yearly Subscription$29.991 Year
CASA Alerts
No in-app purchases
Questions
Is Storm Shield free?
Is CASA Alerts free?
Which has better reviews, Storm Shield or CASA Alerts?
Do Storm Shield or CASA Alerts have ads?
Which is updated more often, Storm Shield or CASA Alerts?
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