Cold Tracking on Apple Watch

TRACK
COLD.
LOG HEAT.

ThermaForge helps you track cold sessions on Apple Watch and log heat sessions on iPhone with temperature, duration, and heart rate data. Free — no account or subscription required.

Download Free See features ↓
ThermaForge showing cold session tracking on Apple Watch and session history on iPhone
COLD Apple Watch
4:12 Min : Sec Session time
Cold sessions on Apple Watch Heat sessions logged on iPhone

What it tracks

🌡

TEMPERATURE

Track session temperature on Apple Watch and add or edit sessions on iPhone with flexible manual entry.

⏱

DURATION

Start and time cold sessions from your wrist, then review session duration trends across days, weeks, and months.

❤️

HEART RATE

Capture live heart rate during Apple Watch-tracked cold sessions and keep everything synced to iPhone automatically.

ThermaForge Apple Watch app showing session setup, timer and heart rate for cold tracking

Apple Watch Native

START A
SESSION.

ThermaForge gives you a fast, clean session flow on Apple Watch with live heart rate and automatic sync back to iPhone.

Track both modalities

Cold session tracking with ThermaForge on Apple Watch and iPhone
Apple Watch + iPhone

COLD

Heat session logging and history in ThermaForge on iPhone
iPhone logging

HEAT

How it works

Cold workflow

TRACK ON
APPLE WATCH

Start a session from your wrist, monitor live heart rate, and let the session sync automatically to iPhone.

  • Start and run sessions on Apple Watch
  • See timer and heart rate live
  • Edit completed sessions on iPhone

Heat workflow

LOG AND
EDIT ON IPHONE

Add missed sessions manually, edit session details, and classify entries as cold or heat with full history and trend tracking on iPhone.

  • Manual add for missed sessions
  • Edit temperature, duration, and notes
  • Reclassify sessions between cold and heat

START
TRACKING.

Free on the App Store. Apple Watch native for cold sessions. No account. No subscription.

Download on App Store