Zelus WBGT
Weather
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Zelus WBGT: Real-Time Heat Safety Monitoring
Zelus is a patented system that delivers hyperlocal Wet Bulb Globe Temperature (WBGT) readings, lightning alerts, AQI data, and compliance documentation tools — without expensive weather hardware.
WBGT is not the same as temperature or heat index. It accounts for the major environmental factors that affect heat stress, including temperature, humidity, wind, and solar radiation.
WBGT is widely used in athletics, military, workplace safety, and heat illness prevention programs because it provides a more complete picture of heat stress risk.
With Zelus, you can monitor the conditions that matter, save important safety data, and document your decisions in the field.
What Zelus Monitors
• Real-Time WBGT
Hyperlocal readings tied to your GPS location or saved locations
• Compliance Documentation
Save safety data with date, time, location, and signature stamps to support accountability, compliance, and internal review
• Saved Locations
Track fields, campuses, job sites, facilities, and event locations
• Lightning Detection
Timely alerts for your area, available with All-Star in the United States only
• Air Quality Index (AQI)
Real-time AQI data, available with All-Star where supported
Who Uses Zelus
Zelus is used by:
• Athletic departments
• Youth sports organizations
• Construction crews
• Utility teams
• Military organizations
• Safety officers
• Outdoor teams that need practical heat and weather safety information
Plans
Zelus is available through a 7-day free trial followed by a paid subscription.
The free version of Zelus is being discontinued on June 1, 2026. Existing free users can start a 7-day trial in the updated app.
• Club
Core WBGT monitoring and saved locations for individual users
• Pro
Everything in Club, plus alerts, compliance documentation, and WBGT forecasts
• All-Star
Everything in Pro, plus lightning detection and AQI monitoring
Subscriptions
Payment is charged to your Apple ID account at confirmation of purchase.
Subscriptions renew automatically unless canceled at least 24 hours before the end of the current billing period.
You can manage or cancel your subscription in your Apple ID Account Settings at any time.
Free trials convert to a paid subscription at the end of the trial period unless canceled beforehand.
A Few Things to Know
• Heat illness can occur at any temperature. Always have a plan in place to prevent, recognize, and respond to heat illness.
• Zelus may use your phone's last known GPS location. For the most accurate results, use saved locations.
• All environmental measurement systems can occasionally produce readings outside an expected range. Users should always apply their own judgment and follow applicable policies, procedures, and local conditions.
• Zelus WBGT may provide less accurate readings in certain environments, including enclosed tennis courts or large black surfaces such as parking lots.
• Lightning detection is not 100 percent. If you see lightning or hear thunder, take appropriate safety precautions immediately.
• Lightning detection is available in the United States. AQI monitoring is available where supported.
• Signup requires a name and email address.
Terms: https://zelusports.com/terms/
Privacy Policy: https://zelusports.com/privacy/
A Closer Look
- Fixed minor bug
The developer, Zelusports LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Zelusports LLC
- Size
- 91.3 MB
- Category
- Weather
- Compatibility
Requires iOS 15.6 or later.
- iPhone
Requires iOS 15.6 or later. - iPod touch
Requires iOS 15.6 or later. - Mac
Requires macOS 12.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Club $4.49
- Pro $19.99
- Monthly AllStar $29.99
- Club $49.99
- Pro $199.00
- Yearly AllStar $299.00
- Copyright
- © Zelusports LLC