Keto-Mojo Unveils Breathalyzer That Reads Ketones Without Fingerpricks

Keto-Mojo unveiled its next-generation Breathalyzer on November 14, 2026, at Hack Your Health 2026, a device that measures acetone in the breath to track ketosis without fingerpricks or disposable test strips. The Napa, California, company opened preorders the same weekend for a limited first release it calls the Founders' First Reserve. Limited production is expected to begin in January 2027, with devices delivered first-come, first-served.

The hardware works on a principle Alexander Graham Bell first described in 1880. The device uses UV-C photoacoustic spectroscopy: ultraviolet light targets acetone molecules in a breath sample, the molecules absorb the light, and the absorption generates tiny pressure waves the device measures to calculate acetone concentration. Acetone is a biomarker tied to ketone production and fat metabolism, so the reading tracks how a body responds to nutrition, fasting and exercise.

The trade the device attacks is real. Blood ketone testing is accurate, but it requires fingerpricks and a running supply of test strips. Urine testing skips the needle and returns a general range instead of a precise level. Existing breath monitors skip the blood, too, but they've historically struggled with sensor degradation and interference from other gases, which is the failure mode Keto-Mojo says its photoacoustic approach is designed to beat.

“We've always believed that you can only improve what you measure,” said Dorian Greenow, the company's founder and chief executive. “For too long, people have had to choose between the accuracy of invasive blood testing vs. the convenience of unreliable breath or urine testing. We developed UV-C photoacoustic technology so that people don't have to compromise.”

Keto-Mojo isn't a newcomer asking for trust. The company is best known for its FDA-cleared GK+ blood glucose and ketone meter, which has sold since 2017, and it runs the MyMojoHealth platform that connects readings with trends and health information. Greenow presented the device at Hack Your Health in a main-stage talk titled “Ketones on Demand: The Missing Control Lever in Human Optimization.” The conference, running since 2017, draws researchers, practitioners and metabolic-health hobbyists.

Two things the announcement doesn't carry: a price and an accuracy figure. The company hasn't published preorder pricing in the release or independent test results comparing the breathalyzer's readings against blood measurements, and those numbers will decide whether the device is a meter replacement or a supplement to one. A broader commercial launch is planned for 2027, when Keto-Mojo says it'll share more product details.

The audience is already trained to measure. Keto-Mojo's meter business grew on people who test blood ketones daily, log the readings and adjust meals against them, so a breath device that removes the strip cost from every reading speaks to an existing habit rather than inventing one. The question the launch leaves open is precision: a daily habit built on numbers will forgive a new device many things, but not readings its users can't trust against the meter on the counter.

Preorders for the Founders' First Reserve are open now. Production starts in January 2027, and the first devices go to the earliest buyers on the list.