Temple, the wearable technology venture associated with Zomato and Eternal founder Deepinder Goyal, will open pre-orders for its first production batch on November 1, 2026. The device will initially be available in six colours, with orders accepted on a first-come, first-served basis. The company has informed people who registered for early access about the upcoming booking window, although it has not yet disclosed the final retail price, the number of units available or a confirmed delivery schedule.
Unlike conventional smartwatches and fitness bands, Temple is designed to attach to the side of the head near the temple. Its optical sensors track changes in cerebral blood flow, a measurement the company calls BrainFlow, while a second metric called Entropy is intended to represent physiological strain. The device is part of Goyal’s broader interest in longevity and human performance. However, its commercial launch will also bring questions about scientific validation, consumer pricing, everyday comfort and whether the measurements can deliver meaningful insights beyond existing wearables.
Key Takeaways
- Pre-order date: Temple bookings are scheduled to open on November 1, 2026.
- Six colours: True Gold, Rose Gold, Black Mirror, Real Jade, Deep Blue and Purple Funk.
- Initial production: The first batch will be made to order, with orders accepted on a first-come, first-served basis.
- Core technology: Optical sensors track changes in cerebral blood flow through the company’s BrainFlow measurement.
- Additional metric: Entropy is designed to reflect physiological strain associated with factors such as sleep, stress, exercise and caffeine.
- Pricing remains unconfirmed: The company has not announced the final retail price or a specific delivery date.
- Health caveat: Temple’s measurements should not be treated as medical diagnoses or proof of clinical benefits.
When Will Temple Pre-Orders Open?
Temple’s first pre-order window is scheduled to begin on November 1, 2026. According to reports based on communications sent to early-access members, the first production batch will be made to order rather than released through a conventional mass-market retail launch.
Orders will be accepted on a first-come, first-served basis. However, the company has not disclosed the total number of devices available in this initial batch or confirmed whether every person on the early-access list will receive a separate priority booking window.
The November 1 date gives prospective buyers a clearer timeline after months of updates about the device’s development and planned launch. Goyal previously said Temple had become considerably smaller than earlier prototypes and indicated that the limited launch edition was expected to ship before the end of 2026.
The exact delivery schedule remains uncertain. A pre-order opening date establishes when customers can attempt to place an order, not when they will necessarily receive the product.
Temple’s six launch colours
The company has confirmed six finishes for the launch edition.
| Colour | Launch status |
|---|---|
| True Gold | Launch edition |
| Rose Gold | Launch edition |
| Black Mirror | Launch edition |
| Real Jade | Limited edition |
| Deep Blue | Limited edition |
| Purple Funk | Limited edition |
Real Jade, Deep Blue and Purple Funk have been described as limited-edition variants. The company has not disclosed how many units will be available in each colour.
The range gives Temple a more consumer-oriented identity as it approaches launch. Nevertheless, the device’s primary proposition is its physiological monitoring technology rather than its appearance.
What Is Temple, and How Does It Work?
Temple is a compact wearable designed to sit on the side of the head, near the temple area between the forehead and ear. Its form factor differs from the wrist-based sensors used by products such as smartwatches and fitness bands.
The device uses optical sensing to collect signals from tissue and blood vessels near the temple. The company uses those signals to track changes in cerebral blood flow, which it calls BrainFlow.
Cerebral blood flow refers to the movement of blood through the brain. It is an important physiological process influenced by multiple factors, including the body’s regulatory mechanisms, physical activity and other conditions.
Temple’s stated goal is to make it easier to observe changes associated with this process during everyday activities. The company wants users to explore how factors such as sleep, exercise, meditation, posture and other lifestyle variables correspond with changes in the measured signal.
However, there is an important distinction between detecting an optical signal near the head and accurately measuring blood flow throughout the brain. Temple describes BrainFlow as a proxy for cerebral blood flow, and the reliability and interpretation of the measurement require appropriate scientific validation.
The device should therefore be understood as an emerging physiological-monitoring product rather than a substitute for clinical equipment or professional medical assessment.
What Is BrainFlow?
BrainFlow is the central measurement behind Temple’s proposition. The company presents it as a way to observe changes associated with blood flow to the brain and examine how the body’s physiological response varies with activity and rest.
For example, a user may want to compare measurements recorded during exercise with those observed during relaxation or sleep. Researchers may also be interested in studying how posture and gravity relate to circulation and other physiological responses.
Goyal has linked the product’s development to his broader Gravity Ageing Hypothesis, which explores whether gravity-related changes in circulation could contribute to aspects of ageing and cognitive decline.
That hypothesis is a research proposition, not an established explanation for ageing. Its broader implications require evidence from rigorous studies, and measurements collected by a wearable do not independently establish that a proposed mechanism is correct.
For BrainFlow to become a dependable consumer metric, researchers need to establish how closely the wearable’s measurements correspond to accepted reference methods, how consistently the device performs across users and activities, and what changes in the readings actually mean.
Until those questions are answered, users should avoid interpreting a particular BrainFlow reading as a direct measure of intelligence, cognitive ability or neurological health.
What Is the Entropy Score?
Temple also produces an Entropy score ranging from 1 to 250. The company describes this metric as an indicator of physiological strain and changes associated with the body’s response to activities and everyday conditions.
According to Goyal’s explanations, the score can vary with factors such as sleep, stress, exercise, caffeine intake and meditation. The company aims to help users observe how their physiological state changes as they move through their daily routines.
The name Entropy should not be confused with the technical concept of entropy used in thermodynamics or information theory. In Temple’s product, it refers to a company-defined measurement whose practical interpretation depends on its underlying methodology and validation.
A numerical score can make information easier to follow, but a number alone does not demonstrate that a measurement is clinically meaningful. Users need to know how the score is calculated, how repeatable it is and whether its changes correspond reliably to a useful physiological outcome.
The company has described research into this metric, including work examining meditation and physiological responses. The broader findings and their implications should be assessed when appropriate research methods, study details and results become available.
How Temple Differs From a Smartwatch
Most consumer wearables concentrate on measurements such as heart rate, movement, sleep patterns and, in some products, blood oxygen estimates or electrocardiogram readings.
Temple takes a different approach by placing its sensors near the head and focusing on signals associated with cerebral blood flow. This could make it useful for research questions that are difficult to explore using wrist-based measurements alone.
| Feature | Conventional smartwatch | Temple |
|---|---|---|
| Wearing position | Wrist | Side of the head |
| Primary focus | Activity, heart rate and sleep-related metrics | Changes associated with cerebral blood flow |
| Main measurement discussed | Varies by device | BrainFlow |
| Additional metric | Depends on product | Entropy score |
| Main consumer use | Fitness and general wellness | Experimental physiological monitoring and research |
| Medical diagnosis | Not a substitute for professional assessment | Not established as a diagnostic device |
This comparison describes broad product positioning, not a controlled test of measurement accuracy.
Temple’s different placement could be useful for studying physiological signals that wrist-based devices do not directly target. But a novel sensor location does not automatically make a product more accurate or more useful.
The relevant test is whether its measurements are reliable, whether users can interpret them correctly and whether they provide practical information beyond what existing devices already offer.
What About Comfort, Adhesives and Battery Life?
A head-mounted device must solve a different set of design challenges from a wristband. It needs to remain securely attached during everyday movement while being comfortable enough for regular use.
Temple uses adhesive attachments called Grips to hold the device against the skin. Goyal has said these are designed to keep the wearable in place during activities such as exercise, showering and swimming, subject to the product’s stated limitations.
The company has also discussed changing Grips regularly for comfort and hygiene. These consumables form part of the user experience and may affect the long-term cost of ownership if replacements are required.
Goyal has described a battery life of around seven days. That figure is a company-reported specification and should be evaluated under actual usage conditions once the product is commercially available.
Potential buyers will want to understand the included accessories, replacement Grip arrangements, software features and any subscription requirements before committing to an order. The complete pricing structure has not yet been confirmed.
How Much Will Temple Cost?
Temple’s official launch price has not been announced as of October 19, 2026.
Some media reports have cited estimates around ₹75,000–₹80,000, while other coverage has referred to an approximate price of $1,000. These figures are estimates and should not be presented as confirmed retail pricing.
The final cost will matter because Temple is entering a market where customers can already buy established smartwatches, fitness trackers and other health-oriented devices at a wide range of prices.
If Temple is positioned as a premium research-oriented wearable, its value proposition will depend on the quality of its measurements, the usefulness of its software and the experience of wearing it regularly.
Potential buyers should also consider any recurring costs for adhesives, subscriptions or other accessories once the company releases the complete commercial terms.
Until the official price and terms are available, it is too early to make a reliable assessment of the product’s value for money.
Scientific Validation Remains the Central Question
Temple’s proposed focus on cerebral blood flow makes scientific validation particularly important. A wearable can collect a signal without necessarily measuring the intended physiological variable accurately under every condition.
Researchers need to evaluate the device against appropriate reference methods, assess repeatability and determine how factors such as movement, skin characteristics, positioning and environmental conditions affect the results.
It is also important to distinguish measurement accuracy from clinical usefulness. Even if a device reliably detects changes in a physiological signal, that does not necessarily mean the readings can predict disease, diagnose a condition or improve health outcomes.
Independent testing and peer-reviewed research would help clarify what Temple can measure reliably and how users should interpret the data.
Until such evidence is available, Temple should not be treated as a replacement for medical tests or professional advice. People with symptoms or concerns about neurological health should seek appropriate clinical assessment rather than relying on a consumer wearable’s scores.
The Bigger Picture
Temple’s planned pre-order launch highlights a growing interest in wearable technology that goes beyond step counts and heart-rate tracking. By focusing on measurements associated with cerebral blood flow, Deepinder Goyal’s venture is attempting to explore a different category of physiological monitoring.
The commercial opportunity will depend on more than a distinctive design or a compelling scientific idea. Reliable measurements, clear explanations, comfortable hardware, transparent pricing and independent validation will all influence whether consumers find the product useful. Temple’s November 1 pre-order date is the next milestone, but its long-term credibility will depend on what the device can demonstrate in real-world use.
Looking Ahead
Temple’s first pre-order window is scheduled for November 1, with orders expected to be processed on a first-come, first-served basis. Buyers will need to wait for official confirmation of the price, batch size, delivery schedule and any recurring costs. The six-colour launch edition gives the company a more defined consumer offering, but the practical experience of using the device remains to be seen.
The more important milestone will be the evidence supporting BrainFlow and Entropy. If the company can demonstrate reliable measurements and explain their limitations clearly, Temple may establish a distinct role in the wearable market. Until then, its claims should be evaluated as an emerging technology proposition rather than proof that it can diagnose or prevent neurological conditions.
Frequently Asked Questions
1. When do Temple wearable pre-orders open?
Temple pre-orders are scheduled to open on November 1, 2026. The first batch will be made to order, with bookings accepted on a first-come, first-served basis.
2. What colours will Temple be available in?
The six launch colours are True Gold, Rose Gold, Black Mirror, Real Jade, Deep Blue and Purple Funk. The last three have been described as limited editions.
3. How much will Temple cost in India?
The official price has not been announced. Media reports have cited estimates, but buyers should wait for the company’s confirmed pricing and terms.
4. What does Temple measure?
Temple uses optical sensors to track changes associated with cerebral blood flow through a company-defined metric called BrainFlow. It also generates an Entropy score intended to reflect physiological strain.
5. Is Temple a medical device that can diagnose brain conditions?
The product is positioned around wellness and research, and its measurements should not be treated as established medical diagnoses. Independent validation and evidence of clinical usefulness are important before drawing medical conclusions from its readings.
6. When will Temple deliveries begin?
The company has not confirmed a specific delivery date for the first batch. Earlier statements indicated a target of shipping before the end of 2026, but buyers should wait for an official schedule.
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