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| The Temple health tracker has been available for pre-order worldwide since November 1, 2026. |
A new fitness tracker called Temple is betting that your temple — not your wrist — is the key to measuring your health. The device, backed by Zomato founder Deepinder Goyal, tracks blood flow to the brain and introduces a novel "Entropy" and "Span" health scoring system. But at roughly $1,000, early reactions are mixed.
The wearable health market has a new contender, and it's taking a decidedly unconventional approach. While most fitness trackers compete over wrist real estate or slip onto your finger, Temple attaches directly to the side of your head using disposable adhesive pads designed to last two to three days. Replacement pads are included in the purchase price for life.
Pre-orders for the device opened on November 1, 2026, according to the manufacturer's official site, temple.com, which touts the device as a way to measure "how hard your body is working to shed heat, read from your temple."
How Temple Measures Health
At its core, Temple offers the standard suite of health tracking features: heart rate monitoring, sleep tracking, step counting, calorie expenditure analysis, and recovery insights. But the company's pitch rests on two far more unusual capabilities.
The first is BrainFlow, which uses the temple-mounted sensor to monitor blood flow to the brain. The manufacturer suggests this could offer insights into cognitive performance or vascular health — though it remains unproven whether these measurements translate into genuinely useful health information.
The second is Temple's Entropy concept, which assesses physical strain through heat dissipation. The device tracks two key metrics:
- Resting Entropy — intended to reflect the body's strain at rest across multiple systems, including thermal, immune, digestive, cognitive, emotional, and recovery-related loads.
- Entropy Max — meant to indicate performance capacity during intense physical exertion near maximum heart rate.
These two measurements combine into Span, a single overall health score designed to reveal long-term changes in physical condition. According to temple.com, "Healthier bodies maintain low Entropy at rest," and Span is positioned as "the one number that shows you how well your body is doing across a wide range of systems."
Notably, however, the precise formula behind the Span score remains undisclosed.
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| Temple offers the gadget in six colors: True Gold, Rose Gold, Dark Mirror, Deep Blue, Real Jade and Purple Funk. |
Promising Early Data, With Caveats
Temple's internal testing offers some encouraging early signals. In a manufacturer-run study of 43 participants, the device demonstrated an average heart rate deviation of just 1.18 beats per minute — outperforming five competing products, including the Apple Watch Series 12 and Oura Ring 5.
However, the study came with significant limitations: it was conducted entirely by the manufacturer, restricted to treadmill exercise, and has not undergone independent peer review. Whether Temple maintains that accuracy in real-world daily use — and whether the health metrics it derives are actually meaningful — remains an open question. The study also offered no evidence regarding the effectiveness of the BrainFlow feature or the overall Span health assessment.
Pricing Raises Eyebrows
Temple is priced at approximately $1,000 in the US, €900 in Europe, and ₹85,000 in India. Devices are made to order, with an expected shipping window of three months.
The price point has drawn skepticism on Reddit, where users have questioned whether the device offers enough tangible benefits over a conventional fitness tracker to justify the premium. The health gadget is backed by Indian entrepreneur Deepinder Goyal, best known as the founder of food delivery giant Zomato — a detail that adds intrigue but does little to settle the value debate.
The Verdict? Not Yet Written
Temple is undeniably ambitious. Its temple-based placement taps into a well-perfused region of the body that could, in theory, yield more accurate readings than wrist-based sensors. And the Entropy-Span framework represents a fresh attempt to distill complex, multi-system health data into a single actionable score.
But the wearable's most headline-grabbing claims — brain blood flow monitoring and a proprietary overall health metric — lack independent validation. Until third-party studies confirm both measurement accuracy and the clinical relevance of its health scores, Temple remains a fascinating, expensive, and unproven experiment.
For those intrigued by the concept, temple.com is now accepting pre-orders worldwide. Whether it becomes a breakthrough in preventive health tracking or a cautionary tale about hype outpacing evidence, however, is a question only time — and independent science — can answer.