Temple's heart rate tracker superior to wrist-based models: Deepinder Goyal
14 Apr 2026

Deepinder Goyal has shared research data on his start-up Temple's heart rate-tracking wearable.

The study, conducted during a badminton match, tested three devices: Temple's head-mounted heart rate (HR) tracker (Temple HR), a Polar HR device, and a popular screenless wrist fitness tracker.

The results showed that Goyal's Temple had closely matched the Polar system in recording heart rate beats per minute (BPM).

However, there was a stark contrast between performance of HR tracker and that of wrist-worn fitness device.

Temple HR significantly outperformed wrist fitness tracker
Performance comparison

While the Polar HR tracker, a highly accurate heart rate monitoring technology by Finnish sports training computer manufacturer Polar Electro, served as a 'gold standard' for tracking physical exertion, it was Goyal's Temple HR that closely matched its readings.

The wrist tracker lagged considerably behind with an average reading of just 120.5 BPM compared to Temple and Polar's 142.1 and 141.4 BPM, respectively.

Why Temple HR performed better than wrist device
Location advantage

Goyal attributed the superior performance of Temple's HR tracker to its unique placement on the forehead.

He explained that this area has thinner skin and is highly vascularized, meaning that it has many blood vessels. This allows the optical sensors to capture blood flow signals more clearly.

Plus, he said, this region moves much less than the wrist during physical activity.

Goyal hints at future capabilities of Temple HR tracker
Future potential

Goyal hinted at the future capabilities of Temple's HR tracker by saying, "Heart rate is just one of the simpler things. Temple sees more."

This suggests that the wearable gadget, which is being developed to measure the cerebral blood flow, could provide deeper insights into individual health.

The statement reflects a growing trend in the industry toward exploring new wearable formats beyond traditional wrist-worn trackers.