Measure VO2max. Don’t estimate it.
An on-mask analyzer being built to turn breath into a clearer picture of your performance. Oxygen, CO₂ and airflow. A record behind every result.1
Not for sale. Pilot planned for 2027, subject to development and validation.
At a glance. VenTracer is a wireless VO₂max mask in development by Rapid Circuitry in Hyderabad, India. It is designed to measure oxygen, CO₂ and airflow on every breath, so athletes, coaches and labs can read VO₂max, VT1 and VT2 from measured gas exchange rather than a heart-rate estimate. Not for sale, not yet validated and not a medical device. Engineering prototypes are planned for 2027. Last updated .
Designed in India
Watch the film · 78 sBuilt in the open. Tested in stages.
- Current engineering buildOn the bench.
Supervised room-air recording, with the analyzer off-face. Wearer and exercise testing are not enabled.
- Next · reference testingCheck the measurement.
Flow and gas calibration, then agreement with reference equipment. No published accuracy result yet.
- Planned · 2027Test with partners.
Labs and clinics first. Wider access depends on the results. Read the validation plan.
One instrument. Different questions.
What VO₂peak and thresholds could add to the numbers you already train with.
Explore the athlete experience Coaches & teamsMake the retest count.Follow the evidence from one comparable test to the next training block.
See the coaching workflow Labs & clinicsHelp establish the evidence.Evaluate early units alongside your reference equipment in a planned pilot.
Explore the pilot programmeThe measurement starts at the breath.
A compact analyzer on an open flow tube. The design brings gas sensing and airflow together on the mask.1
- 01 · Sense
Oxygen, CO₂ and airflow.
The inputs needed to calculate oxygen uptake, aligned breath by breath.
- 02 · Keep
The signal behind the summary.
Raw observations, timing and processing details stay with the record.
- 03 · Review
Results with their limits.
Quality flags and reviewer decisions belong beside the number.
Watches estimate from heart rate and pace. Gas-exchange systems measure the air you breathe. VenTracer’s measurement accuracy remains unvalidated.
A number is only the beginning.
Explore the result, its boundaries and the evidence behind it. Three fictional scenarios, not measurements from a VenTracer unit.2
A peak, with context.
VO₂peak is the highest eligible oxygen-uptake value in a test. The report keeps the averaging window and confirmation status beside it.
In this example, VO₂max remains unconfirmed. The peak still has a name, a unit and a traceable source.
Understand VO₂peak and VO₂max52.8 ml/kg/min
- Averaging window
- 30 seconds
- VO₂max
- Unconfirmed
A fictional example, not a target or personal result.
Training domains, with a review trail.
VT1 and VT2 connect the gas-exchange curves to three intensity domains. Their source and review status matter as much as their position.
The planned workflow asks a reviewer to confirm or move VT1. VT2 can be overridden, with the original and final picks retained.
Understand the thresholds- VT1
- Reviewer confirmation required
- VT2
- Algorithm pick · can be overridden
Illustrative boundaries, not a training prescription.
Sometimes the useful answer is a limit.
An incomplete recording should say so. Missing intervals stay visible, rejected breaths remain in the export, and the report explains why a result is unavailable.
This scenario shows a withheld result. A polished chart cannot make an unusable test complete.
Inspect the data contractResult withheld
- Recording
- Incomplete
- Missing intervals
- Visible in the trace
- Rejected breaths
- Retained in the export
An example of reporting a limitation, not a device result.
Concept interaction only. Exercise testing is not enabled in the current engineering build. The current flow element is characterised to about 85–100 L/min; a high-flow element for maximal tests is in development and needs separate validation. Explore the planned app workflow.
Why breath. Why now.
The idea behind VenTracer, in just over a minute.
Narrated, with English captions. Charts are illustrative. The cited fitness and mortality study shows an association, not proof of longer life. Read the watch-accuracy evidence and fitness and longevity evidence.
What does VenTracer measure?
It is being designed to measure breath flow, oxygen and carbon dioxide on every breath, on the mask. From those it calculates VO₂, VCO₂, RER and ventilation, then VO₂max and the two ventilatory thresholds (VT1 and VT2) from a ramp test.1 See the outputs.
Is it accurate?
We don’t know yet, and we won’t guess. Early units will be tested side by side with laboratory metabolic carts at partner sites, and results published before any accuracy figure appears.3 Read the validation plan.
When can I get one?
Engineering prototypes are planned for 2027 (dates may change), followed by the validation pilot. Labs and clinics test first; athletes on the waitlist hear first when athlete units open. Pricing hasn’t been announced, and joining the waitlist costs nothing.
Help shape what comes next.
Join the waitlist, or discuss a reference-testing pilot for your lab or clinic. No purchase and no commitment.