Deepinder Goyal defends wearable device Temple
Deepinder Goyal took to X on Thursday to counter Indian doctors who criticised his brain-monitoring wearable Temple.
Defending the science behind the device, he said, “First and foremost, a business lesson: if Temple were a scam, and any of what we said weren't true, people would know it in just a few days of using Temple.”
He also said the device features a 14-day no-question return policy. “If the product doesn't work, it fails out of the gate and the company dies before recovering a tenth of its R&D," he said.
In the post, Goyal also highlighted that $30 million was invested in building the device, of which he put in $20 million of his personal money.
Calling this as his purpose, he said that it's not about money. “I have enough of it to last for generations. My incentives are fully aligned with getting the science right. I am not staking a reputation earned over 20 years on making a quick buck.”
Goyal also compared Temple to Whoop, a fitness band launched in 2015. He argued that most wearable companies start with internal studies and that Whoop published its first validation a few years later. He also added that Temple had a higher standard.
"Pre-prints are a step prior to peer reviewed publications, and they are coming up."
Showing confidence in the product, he said, “We stand by our science and our methods. Each of our claims is easily verifiable by individuals and institutions alike, and you will see a lot of independent studies come up on their own when the device becomes available to use.”
Moreover, he added that this device is a fitness tracker, and wellness device, not a medical device. “If at some point, we clinically validate any of our metrics, we will let you know.”
Dear Concerned Indian Doctors,
— Deepinder Goyal (@deepigoyal) November 5, 2026
I see your rage against Temple on X. I have a few points
to make:
1. First and foremost, a business lesson: if Temple were a scam, and any of what we said weren't true, people would know it in just a few days of using Temple. We have 14-day,…
However, some doctors were not convinced with Goyal’s response.
On X, Dr Rishabh Jain responded saying Goyal shared financial and personal sacrifices but no scientific evidence. "Stop calling legitimate scientific scrutiny 'rage.'"
“You have responded to questions about medical accuracy with investment figures, return policies, personal reputation, and promises of future studies. None of these constitutes scientific validation.”
Criticising the return policy he said, "Subjective satisfaction cannot establish medical accuracy.”
Dr Jain further said that doctors are not against innovation. However the evidence needs to show it. "If Temple delivers what it promises, doctors will be among its biggest supporters."
He also said that science is not a popularity contest, and criticism is not “rage".
Dr Jain also asked for data that can be reviewed by independent researchers.
Dear Temple Team,
— Dr Rishabh Jain (@DrRishabhOnco) November 5, 2026
Doctors are asking for scientific evidence, not your financial history, personal sacrifices, or business credentials. Stop calling legitimate scientific scrutiny “rage.”
You have responded to questions about medical accuracy with investment figures, return… https://t.co/wh6N0zPypu
Temple is a wearable device that tracks blood flow and oxygenation inside the brain. Goyal has not disclosed the price of the device.
In May this year, Goyal announced that the first 100 devices were ready to be shipped to select founding users and was aimed at athletes, scientists, doctors, founders, creators, and others who could provide feedback on the device. The company has said that the device will be ready to be shipped before the end of this year.
In February this year, Temple raised $54 million in its first funding round from friends and family investors, at a valuation of about $190 million.
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