Want to pre-order the Temple wearable? Here are 5 things to know

Deepinder Goyal’s Temple wearable seems to be the biggest talking point in the wearable category. And why not, the device will sit against the side of your head and will monitor changes related with blood flow to the brain. The idea is to offer insights that conventional smartwatches and fitness trackers may not capture. With pre-orders expected to open soon and early-access waitlist members set to receive priority, interest in the device is growing. However, Temple is entering a category where the science matters as much as the hardware. Here are five things to know before considering a purchase.

✅ Thank you for completing the survey!

1. Temple is designed to track brain blood flow, not just everyday activity

The consumer wearables focus on familiar metrics such as heart rate, steps, sleep duration, calories burned and workout performance. Temple takes a different approach by placing its sensor near the temple, the area on the side of the head, to track signals associated with cerebral blood flow.

As per Goyal, the device uses photoplethysmography, or PPG, a light-based sensing method already found in devices such as smartwatches. PPG detects changes in blood volume by analysing how light interacts with tissue. While conventional wearables primarily use this information to estimate metrics such as heart rate, Temple’s BrainFlow system wants to track changes linked to blood flow in the brain.

READ: Amazon Great Indian Festival 2026: Ray-Ban Meta smart glasses, Apple Watch Series 11 and more wearables get discounts

Goyal, in multiple posts, has described the device as a way to collect physiological information that wrist-based trackers cannot easily provide. The longer-term ambition is to use these measurements to understand how the body responds to exercise, changes in posture, rest and other conditions.

Temple has also discussed a proprietary metric called Entropy, which is intended to help interpret physiological signals. However, buyers should not assume that a single score provides a complete picture of mental fatigue, concentration or overall brain health. The meaning of such metrics depends on how they are calculated, validated and interpreted.

But for now, Temple’s central proposition is straightforward: it wants to monitor a different part of the body’s physiology rather than compete with smartwatches on step counts alone.

1. The science is promising, but independent validation remains important

The biggest question surrounding Temple is not whether it can collect a signal, but how accurately that signal represents changes in the brain and what conclusions can be drawn from it. Goyal has shared early research examining Temple’s BrainFlow measurements against established research methods. In September 2026, he discussed a validation study involving 23 healthy adults that compared the device’s readings with transcranial Doppler measurements, a method used to assess blood-flow velocity in a major brain artery.

Another study, shared later that month, reportedly involved 60 participants and compared Temple’s readings with time-domain near-infrared spectroscopy, a technique designed to distinguish changes in brain tissue from signals originating in the scalp. The company reported correlations between 0.84 and 0.91 across three physiological tests. The findings were described as a preprint submitted for peer review, rather than an established clinical standard.

These results are relevant because measurements taken near the skin can be affected by superficial blood circulation, movement and other physiological factors. Establishing how reliably a wearable separates these signals is an important step in demonstrating that its readings are meaningful.

Medical experts have also cautioned against treating Temple as a diagnostic device. A measurement associated with brain blood flow does not, by itself, establish whether someone has a neurological condition, is experiencing cognitive decline or will develop a health problem in the future.

1. Price

Temple is not expected to compete with affordable fitness bands. Goyal has indicated that the launch device could cost around US$1,000, with reports placing the expected price in the region of Rs 80,000 to Rs 1 lakh. The final India price has not been officially confirmed, so prospective buyers should treat these figures as indicative rather than a confirmed retail price.

At that price, Temple would sit well above mainstream smartwatches like Apple Watch Ultra and smart rings. Buyers would be paying for a specialised sensor and a different approach to physiological monitoring, rather than a conventional fitness tracker with a screen and familiar workout features.

READ: Samsung Galaxy Watch 9 vs Apple Watch Series 12: Price, features and everything compared

The company has also discussed a pricing arrangement that includes access to its software platform, which processes the data collected by the device. Goyal has said that users will receive an unlimited supply of the adhesive Grips required to attach Temple to the skin, without a separate recurring payment for replacement tapes. The exact commercial terms should be checked when official pre-orders open.

1. It sticks to the skin using disposable adhesive Grips

As per Goyal, Temple does not use a conventional watch strap or ring. Instead, it attaches to the skin near the temple using specially designed adhesive patches called Grips.

According to details shared by Goyal, the device is designed to remain attached during everyday activities and workouts. It is also intended to be compatible with glasses, although the fit will naturally depend on a person’s face shape and eyewear.

Battery life is another factor to consider. The company has discussed a battery cycle of up to seven days, but actual endurance will depend on final hardware specifications and usage. Buyers should wait for confirmed specifications and independent testing before treating that figure as a real-world guarantee.

Temple’s compact form may make it less intrusive than earlier prototypes, but it will still be a visible device worn on the side of the head. That is a different proposition from a smartwatch hidden beneath a sleeve or a ring that blends into everyday accessories.

1. Pre-orders are expected soon, but early access is not proof of medical usefulness

Temple is preparing for a limited launch edition, with Goyal saying that pre-orders would open soon and that people on the early-access waitlist would receive priority. The company has also indicated that shipments are targeted before the end of 2026. Buyers can follow announcements through the official Temple website and its early-access mailing list.

The launch edition is expected to come in six colour options: True Gold, Rose Gold, Black Mirror, Real Jade, Deep Blue and Purple Funk. The smaller design is intended to make the wearable easier to use alongside glasses and during everyday activities.

READ: Buying a smart ring? Here are 5 things you need to know first

However, a limited launch and an exclusive early-access group should not be confused with evidence that the product is ready for medical use. Early buyers may help the company gather feedback and understand how the hardware performs outside controlled research settings. That can be useful for product development, but it does not replace independent scientific studies or clinical validation.

There is also a difference between collecting physiological data and knowing what to do with it. A wearable might detect a repeatable change in a signal without being able to explain whether that change reflects stress, fatigue, recovery or a more significant health issue. Such interpretations require evidence, not just a new metric in an app.