New health gadget tracks brain blood flow and claims to reveal how healthy you are for $1.000

At its core, Temple is a fitness tracker that monitors blood flow and uses the measurements to derive various health metrics. Unlike conventional wearables, however, the device isn't worn on the wrist or finger but attached to the temple. It uses disposable adhesive pads that are designed to last two to three days, with replacement pads included in the purchase price for life. The manufacturer believes that positioning the device on the well-perfused temple allows for particularly accurate measurements – and uses this placement to enable some unusual features.

Temple aims to “measure health” 

Temple offers the typical functions of conventional health trackers, including heart rate monitoring, sleep tracking, step counting and analysis of calorie expenditure and recovery. However, it also comes with some distinctive features. One of these is called "BrainFlow." The temple-mounted tracker is designed to monitor blood flow to the brain, potentially providing insights into cognitive performance or vascular health. However, it has yet to be demonstrated whether these measurements can actually provide meaningful health information.

Another unusual feature is Temple's so-called entropy concept, which aims to assess physical strain based on heat dissipation. The device measures two metrics: "Resting Entropy," which is intended to reflect the body's strain at rest, and "Entropy Max," which is supposed to indicate performance capacity during intense physical exertion. Temple uses these measurements to calculate an overall health metric called "Span," designed to reveal long-term changes in physical condition. However, exactly how this score is calculated remains unclear.

Initial results regarding measurement accuracy look promising. In an internal study involving 43 participants, Temple showed 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 was conducted by the manufacturer itself, was limited to treadmill exercise and has not yet undergone independent evaluation. Whether Temple can deliver similarly accurate measurements in everyday situations – and whether the health metrics derived from them are actually meaningful – remains to be seen. The study also provides no evidence of how well the BrainFlow feature or the overall health assessment works.

Price sparks debate

Temple has been available for pre-order worldwide since November 1, 2026. The wearable costs 85,000 rupees in India and €900 in Europe. The manufacturer had previously announced a US price of approximately $1,000. The health gadget is backed by Indian entrepreneur Deepinder Goyal, best known as the founder of food delivery service Zomato. According to the manufacturer, the devices are made to order and are expected to ship within three months. Initial reactions on Reddit have been rather skeptical, however. Users consider the price excessive and question whether the device offers enough benefits over a conventional fitness tracker to justify the cost.