Temple's Deepinder Goyal Says Wearable Beats Apple Watch on Heart Rate Accuracy

Temple founder and CEO Deepinder Goyal said the company's wearable tracked heart rate more accurately than the Apple Watch in an internal study, and pre-orders opened on November 1. Goyal made the claim in a post on X, NDTV Profit reported.

How Temple Ran Its Heart Rate Study

Goyal said one of Temple's goals is to build the ultimate wearable for elite athletes, and that heart rate was the place to start. He said accurate tracking is harder than most people think, especially in Zones 4 and 5, the high-intensity zones professional athletes care about most.

For the test, Temple used a Polar H10 chest strap as its reference, taped to the chest because straps worn the usual way can lose contact during a sprint and miss beats, Goyal explained. Five flagship wearables were compared against that reference second by second, from rest to maximum effort: the Apple Watch, Garmin FR970, Fitbit Air, WHOOP MG and Oura Ring 5.

Charts shared by Goyal show Temple recording the lowest error at rest and in every heart rate zone. He said the Apple Watch Series 12 came closest among the other devices, and that the Oura Ring 5 showed the highest error throughout. Goyal also claimed Temple beat an untaped chest strap, which he called the industry benchmark, in Zones 4 and 5.

Goyal gave two reasons for the result. Temple sticks to the skin with an adhesive, so the way it was tested matches how people wear it, and users should see the same accuracy in real life, he said. The second is placement: the temple lies over a major artery, and it is the one area of skin where blood flow does not tighten up during hard exercise, Goyal said. The company tested the same sensor at four spots on the body, and the temple gave the most accurate readings.

Temple's Entropy Score and Early Device Batches

According to akta.pro company records, Temple announced its Entropy biomarker, a proprietary 1-250 real-time metabolic cost score, in June 2026 and opened it for beta testing as its core differentiator versus wrist-based wearables. In May 2026 the company signed manufacturing partnerships with Zetwerk for scale-up production and Ethereal Machines for precision sensor work, supporting an initial run of a few thousand units for India and US markets. The same records show Temple shipped its first 100 devices in May 2026 to an invite-only founding cohort of athletes, scientists, doctors and creators.

Athletes and Acquisitions Before the Launch

In October 2026, Shubman Gill wore the unreleased Temple AI fitness-tracking device during a practice session in Auckland, joining KL Rahul and Ishan Kishan, Gadgets 360 reported. TimesNow reported that month that pre-orders would open November 1 in six launch colours, including True Gold and Rose Gold. In September 2026, Temple acquired London-based longevity medicine practice Longevous, with founders Rob Mohr and Avi Roy joining full-time, NDTV Profit reported.

Independent Review of Temple's Data

Goyal said the full paper and data are available on the company's website, and that independent researchers are now running an extended study. Temple has invited others to replicate the findings under more conditions and said it will fund such work.