Zelus WBGT 4+

Zelusports LLC

Designed for iPhone

    • 3.1 • 8 Ratings
    • Free
    • Offers In-App Purchases

iPhone Screenshots


The First of Its Kind App Designed to Accurately Give Wet Bulb Globe Temperature Readings in Seconds, NOW WITH LIGHTNING STRIKE WARNING CAPABILITY. Trusted by Schools, Universities, Police Departments, and the US Army Special Forces.

Keep track of the Wet Bulb Globe Temperature (WBGT) on some of the hottest days of the year to protect yourself from heat-related conditions, such as heat stroke, exhaustion, cramps, and heat rash.

Zelus goes beyond traditional WBGT readings by combining details of hyperlocal weather data, such as the relative humidity, solar radiation, angle of the sun, cloud cover, air temperature, and more, to provide the most valuable and accurate information. Receive precise data with the press of a button from anywhere.

Free Features:

• WBGT reading – WBGT reading at your phone’s last known GPS coordinates.
• Current Hyperlocal Weather Data – Numerous current weather data points.
• No Equilibration Needed - Get the valuable details you need in less time. The Zelus app doesn't require equilibration, so you can get temperature readings in mere seconds instead of waiting 15 minutes or more.
• Hassle Free – No more looking for batteries. No more calibration. No more running back to the office for a forgotten device.

Paid Features:

• WBGT Anywhere in the World – Obtain WBGT readings anywhere in the world.
• Save Locations – Save your most important locations for quick access at any time.

• All of Club Features
• Regular Temperature Threshold Alerts - Get instant alerts when the WBGT exceeds your threshold.
• Save Your Data in Seconds - Choose to save your readings with an electronic signature and time/date stamp at the press of a button.
• Automated Documentation – Carrying paperwork with you is no longer needed. Export your saved data to your email in seconds.

• All of Pro Features
• Lightning Strike Warning – Get alerted when lightning strikes near the locations you choose.
• Time Since Last Known Strike – Get alerted after time has passed since the last known lightning strike.
• Lightning Alerts Only Available in the United States

Whether you're playing football, soccer, basketball, or simply walking around outside, it's crucial to have an accurate WBGT reading. If the temperature is too high based on this reading, you're at risk of suffering from heatstroke and other heat related illnesses that put your life at risk.

Use Zelus to take daily measurements, keep track of data, and skip outdoor practice when it's simply too hot for training and other outdoor activities. Now, also be protected during lightning storms!

Terms at: https://www.iubenda.com/terms-and-conditions/72489665

Heat Illness can happen at ANY temperature. Always be prepared and have a plan in place to manage heat illness.
Even though it is very rare, all measurement devices will occasionally give readings outside of expected range. The operator should always use their best judgment on activity levels.
Zelus WBGT may give inaccurate readings in enclosed tennis courts or on large black surfaces such as parking lots.
Zelus WBGT uses the phones last known GPS location, this may not be the phone’s current location.
For most accurate results WBGT readings should be made with saved locations.
Over 99% of all lightning strikes will be reported, but it is not 100%. If you see or hear lightning take safety precautions as needed.

What’s New


- Fixed minor bug

Ratings and Reviews

3.1 out of 5
8 Ratings

8 Ratings

Joceebear❤️❤️❤️❤️❤️ ,

App is okay, but there’s something wrong.

The thought of the app was a good idea, but for some reason, when in reality it’s 100°F, IT SAYS ITS 90°F ON THE APP, MAKING IT OKAY TO PRACTICE???? That’s crazy. Crazy? I was crazy once. They locked me in a room. A rubber room. A rubber room filled with rats. The rats made me crazy.

ANYWAYS, something is wrong. Please fix it ASAP

Developer Response ,

Please note that the app gives WBGT readings. Air temperature and WBGT are completely different numbers.

merikus1 ,

Want to know the WBGT? This is the app for you.

This app is a great example of a tool that does exactly as advertised. Do you want to know the WBGT? This will give it to you. It will also allow you to see various scales for WGBT and their recommendations for outdoor activities.

As opposed to other apps, it’s clear you’re getting the WBGT here and not the Wet Bulb Temperature, which are (unfortunately) two different things.

And that’s enough. If you need the WBGT and know what that is, then this is the app for you. If you don’t, go google it and then come back and download this app. WBGT is quite useful, and this app usefully provides it.

ComoSteve ,

Quicker and more convenient than a handheld meter

I started using the app recently and it is a lot more convenient than carrying around a handheld. I checked the readings against a handheld and they are either identical or very close. So far, so good.

App Privacy

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

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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