Why I built it
Heat blocks without the phone.
I do heat sessions on the trainer before hot races. I wanted my core temp on my wrist without picking up my phone with sweaty hands every five minutes.
Nils
LiveHeat connects your Apple Watch straight to your CORE sensor and shows your body temperature every second. Your phone can stay in your bag, or at home.

Baseline, elevated, heat training and danger. A needle shows where you are inside the zone, not just which one.

See how long you've spent in each heat zone today, in minutes and percent. Built for heat acclimation blocks.

Set your own zone limits and HR thresholds. Celsius or Fahrenheit.

LiveHeat talks to your CORE sensor over Bluetooth directly from Apple Watch and updates every second.
Heart rate sits right under core temp, each with its own zones. Use a Bluetooth chest strap or the watch's own sensor.
Demo mode lets you see how it works before your sensor shows up.
Why I built it
I do heat sessions on the trainer before hot races. I wanted my core temp on my wrist without picking up my phone with sweaty hands every five minutes.
Nils
No. It connects to the CORE sensor directly from Apple Watch.
A CORE body temperature sensor. For heart rate you can use a Bluetooth chest strap or your watch's own sensor.
Training in the heat, or raising your core temperature on purpose indoors, so your body adapts before a hot race. Watching your core temp keeps those sessions in the useful range and out of the danger zone.
No. You buy it once.
Requires a CORE body temperature sensor. CORE is a trademark of greenTEG AG. LiveHeat isn't affiliated with or endorsed by greenTEG.