Deepinder Goyal's Temple wearable tracks head blood flow with Entropy metric

Temple, a head-worn health wearable from Zomato founder Deepinder Goyal, attaches to the temple and uses BrainFlow sensors to monitor blood flow, generating a proprietary Entropy score (1–250) for cognitive load and stress. Pre-orders are expected next week, with about seven days of battery life.

• Attaches to the temple with adhesive Grips, replaced every 2–3 days
• BrainFlow sensors sit over the superficial temporal artery, not the wrist
• Entropy metric ranges from 1 to 250 and updates continuously
• About 7 days of battery life, safe for swimming and workouts