CT1 · Core Body Temperature Smart Band
Invisible heat. Visible warning.
Continuous core temperature, learned against your own baseline, expressed as a four-level colour alert you can read without looking at a screen.
US$199Free worldwide shipping
The problem
Two temperatures. Two very different risks.
Most bands report skin temperature. It is easy to measure, and almost useless at the moment it matters most: as sweat evaporates, skin temperature falls while core temperature keeps climbing. The most dangerous rise is exactly the one that gets hidden.
CT1 reports core temperature — the value that maps directly to heat-stress and fever risk. Wrist temperature is only one input; heart rate, HRV and ambient conditions feed the same estimate.
The signal
Know what your body is saying, without looking
Two emissive arcs sit above and below the dial. One value drives both colour and vibration, so your state is always at the edge of your vision.
Normal · Green
Low steady or slow breathing light.
Vibration: noneMild · Yellow
One short flash, then slow breathing.
Vibration: none · Consider hydratingModerate · Orange
Two short flashes, then medium breathing.
Double pulse, repeated · Stop and restSevere · Red
High-frequency flashing with continuous escalating vibration.
Stop immediately · Cool down · Seek help if needed
The method
Four signals. One personal baseline.
CT1 does not compare you to a population average. It learns your circadian temperature rhythm first, then judges what counts as abnormal — because the same reading can be perfectly normal for one person and drifting for another.
IR temperature
Wrist skin temperature — one base input.
Heart rate & HRV
PPG signal and RMSSD, reflecting cooling load.
Ambient conditions
Temperature and humidity rate heat exposure.
3-axis motion
Activity and wear state, used to reject noise.
All four feed one core-temperature algorithm, developed in joint R&D with a medical university.
One wear, three jobs
The same data serves three very different needs
Heat-stress protection
For outdoor and high-heat work — construction, sanitation, logistics, inspection. Heat load accumulates long before symptoms appear. CT1 tells you which level you are at, not just that you are hot.
Fever screening at home
For older adults, children in care and people recovering from illness. Fever usually shows up before symptoms do. You stop having to remember to measure.
Women's health
Long-term basal temperature rhythm, cycle prediction and ovulation windows, with the temperature curve laid over the calendar. The rhythm charts itself.
The numbers
Built for long wear
For everyone in the heat, a visible warning line.
Know where your body stands before it tells you the hard way.
Health reference and trend monitoring only — not a medical claim.