HeatLab: Hot Workout Tracker

About this app

HeatLab is the heart rate and heat training app made for hot yoga, hot pilates, sculpt, and every heated workout in between. Track each class with your Apple Watch, then watch your body adapt to the heat over weeks and months. Generic fitness apps don't understand heated training. A 145 bpm average means something different at 105°F than at room temperature, and a basic "calories burned" stat tells you nothing about how your body is acclimating. HeatLab is built specifically for the heated workout community. TRACK WHAT MATTERS Tap to start on your Apple Watch - Vinyasa, Pilates, Sculpt, Bikram, Barre, or any custom class. Live heart rate, elapsed time, a rolling HR chart, and an ambient "Zen" visualization keep you focused mid-session. After class, capture the room temperature and your perceived effort. Workouts sync automatically to Apple Health and HeatLab on iOS. UNDERSTAND YOUR HEAT FITNESS • Heat Fitness Score - a composite score that builds with each heated session and reflects your real adaptation • Resting HR delta - proof the heat is working, tracked from your first heated session forward • Baseline comparisons - every session benchmarked against your personal baseline for that temperature • Zone analysis - time-weighted breakdown across HR zones 1–5, per session and per temperature bucket • Personal records - highest max HR, longest time in zone 4+, and more, by class type and overall • Trend charts and period-over-period comparisons by week, month, or year AI INSIGHTS, ON YOUR DEVICE HeatLab uses Apple Intelligence to generate session summaries and trend insights - all on-device. Your data never leaves your iPhone. On devices without Apple Intelligence, a powerful analysis backend drives the insights. BUILT FOR APPLE WATCH HealthKit-native workout sessions, dual-path background sync, always-on display, and device lock for sweaty sessions. Sessions arrive on your iPhone the moment you're back in range. DESIGNED FOR THE STUDIO • Filter by class type, temperature bucket, or date range • Edit class type, temperature, notes, or duration after the fact • Streaks, week-over-week comparisons, and weekly zone distribution • Smart claim flow for workouts you forgot to record on your Watch • Custom class types - add Hot HIIT, Heated Strength, or whatever you practice HEATLAB PRO Free tier includes core tracking, sync, and the past 7 days of history. Pro unlocks: • Unlimited session history • Apple Intelligence session summaries and AI insights • Heat Fitness Score and resting HR trend • Zone analysis and personal records • Full period-over-period comparisons Available as a monthly or annual subscription. Restore purchases anytime. PRIVACY Your health data stays on your device. AI runs locally through Apple Intelligence - your sessions, heart rate, and notes are never sent to a server. Built by a small team that practices what we ship. Questions? Email support@heatlab.app - we read every message. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Bugfixes

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Aug 12, 2026 · 3:24 AM Free