Archive · 6 Oct 2026
Temple Wearable Nears Launch With PPG Sensor Technology
Temple is a small wearable that sits near the side of the head.
Its sensor uses light to detect changes in blood volume, much like sensors in some smartwatches.
The company is developing a system called BrainFlow to track blood-flow changes linked to the brain.
A study with 60 people compared its readings with another measurement method and reported correlations from 0.84 to 0.91.
That study has not yet completed peer review.
More research is needed to know exactly what the readings mean.
Deepinder Goyal says pilots and air-force personnel could be possible users in the future.
Pre-orders are expected soon, but the price in India has not been confirmed.
Zomato founder Deepinder Goyal says Temple uses a photoplethysmography (PPG) sensor, like those in smartwatches.
Goyal says the sensor poses no risk to a developing brain, and sees little reason for under-18s to use it except for specialized training.
Temple’s BrainFlow system was tested with 60 participants, with reported correlations of 0.84 to 0.91 against time-domain NIRS across three physiological tests.
The validation study is a preprint submitted for peer review; broader claims about what Temple can measure require further evidence.
Goyal has cited pilots and air-force personnel as possible future users; pre-orders are expected soon, while Indian pricing remains unconfirmed.
- Who
- Deepinder Goyal, founder of Zomato, discussed Temple and its technology.
- What
- Temple is a wearable using a PPG sensor, with BrainFlow being developed to track brain-related blood-flow changes.
- When
- Goyal says pre-orders will open soon; no launch date is specified.
- Where
- The article discusses the expected price and availability in India.
- Why
- The device is intended to track signals associated with blood flow, with possible uses in personal tracking and, subject to validation, aviation and defence.
Potential Uses
Cautions and Evidence
Brain-related readings
Potential Uses
Temple’s BrainFlow system is being developed to track blood-flow changes associated with the brain, and a study reported correlations of 0.84 to 0.91 against time-domain NIRS.
Cautions and Evidence
The study is a preprint submitted for peer review, and further independent validation is needed to establish accuracy and what users can conclude from readings.
Aviation and defence applications
Potential Uses
Goyal suggested the device could be used to assess pilots’ fitness to fly and help identify air-force personnel fit for a mission.
Cautions and Evidence
Such high-stakes applications would require strong scientific validation; the article says it remains unclear how much Temple can directly measure broader functions.
Use by people under 18
Potential Uses
Goyal said the PPG sensor is like those in smartwatches and that there is nothing in it that can harm a developing brain.
Cautions and Evidence
Goyal said he sees little reason for people under 18 to use Temple unless they are training for something such as the Olympics.
- Sensor
- Photoplethysmography (PPG), a technology also used in smartwatches
- System under development
- BrainFlow
- Validation study
- 60 participants
- Reported correlations
- 0.84 to 0.91 across three physiological tests against time-domain NIRS
- Study status
- Available as a preprint and submitted for peer review, according to Goyal
- Possible applications mentioned
- Monitoring whether pilots are fit to fly and assessing air-force personnel for missions
- Price in India
- Not officially confirmed; some reports and leaks suggest close to ₹1 lakh
- Pre-orders
- Expected to open soon, with early-access waitlist members expected to receive priority