Hilo G1 Review: 24/7 Cuffless Blood Pressure Monitoring

Classic home blood-pressure measurement is no more than a snapshot — whether your readings spike for the rest of the day stays hidden. The Hilo G1 promises a revolution: a blood-pressure monitor that measures continuously at the wrist, without ever inflating.

The danger it targets is called masked hypertension. Around 15 per cent of people are affected: normal readings at the doctor's, elevated pressure the other 179 days — undetected and untreated. Even where hypertension is diagnosed, roughly one in four people with the condition remains unaware of it.

The G1 box contains only the essentials: the Hilo band (pod and strap), a charging cradle, the Hilo cuff (a conventional upper-arm monitor used for calibration), a micro-USB cable — but no mains plug, so you supply your own — and a manual printed so small that anyone with imperfect eyesight needs a magnifier. The calibration cuff fits upper arms from 22 to 42 cm, covering most adults. The QR code to the app led nowhere and had to be found manually in the app store.

Both devices charge before first use: the band in its USB cradle (no mains adapter supplied), the cuff via dated-but-functional micro-USB. The band runs roughly 15 days per charge — tattoos, darker skin, dense arm hair or lots of movement can shorten that — while the cuff still showed 99 per cent after the entire test period. Build quality of both devices is very good; the cuff fits arm circumferences of 22 to 42 centimetres comfortably. The rubbery strap recalls a certain classic digital watch and attracts dust readily; nylon replacements are a paid extra. IP68 certification means hand-washing and swimming are no problem. Neither device has a display: everything runs through the Hilo app (iOS 16+, Android 8+).

The app starts with a user profile — age, weight, height — then delivers a dampener: a subscription is required. The first year is free; after that an annual membership is required to keep the band's readings active. Before the band can measure on its own it must be calibrated against the cuff: band on one arm, cuff on the other, measurement started — repeated on four further days, then monthly thereafter. Once calibrated, the band monitors around the clock, taking several readings an hour whenever the arm is still, using optical PPG (photoplethysmography) sensing rather than inflation. Readings sync to the app over Bluetooth and are stored, encrypted, on Hilo's own GDPR-compliant cloud servers in Europe.

Once calibrated, the band monitors around the clock, measuring several times an hour whenever the arm is still. It uses photoplethysmography (PPG), shining light through the skin to track blood-volume changes in the vessels beneath; the data goes to Hilo's servers, where algorithms compute the blood pressure. Only a blinking green light betrays that it is working. Hilo states the data lives on European cloud servers, GDPR-compliant, AES-256 encrypted at rest and TLS in transit. The G1 carries CE certification as a Class IIa medical device and is clinically validated on an ISO 81060-2 protocol adapted for cuffless devices.

The cuff's readings convince: the manufacturer claims average deviations under five mmHg for systolic and diastolic values, and comparison measurements — at least three per subject, five minutes apart, against a calibrated manual sphygmomanometer of the kind doctors use — bear that out. Spot checks of the band's automatic readings convinced too (they cannot be triggered manually). The manufacturer is clear that the band supports monitoring and replaces no medical diagnosis.

The app lists every reading from cuff and band, groups trends by day, week or month, computes day and night averages, classifies the result and exports a PDF report for doctor's visits. The band also records sleep, steps and heart rate — rough orientation values rather than fitness-tracker data — and explains how they interact with blood pressure.

The niggles are modest but real: the microscopic manual, the dust-attracting rubber strap with its paid nylon alternative, and above all the price — £199.98 for the device (check the price on Amazon) plus the obligatory annual subscription after the free first year. On the plus side it is rated IP68, so it can stay on in the shower or the pool — sensible for a monitor meant to be worn around the clock.

The Hilo G1 rethinks blood-pressure measurement. Because the band collects data continuously, it exposes dangerous spikes that doctor's visits and occasional home measurements never catch. For hypertensives, continuous monitoring genuinely pays off, revealing how sleep and inactivity drive readings. Young, healthy users will likely lose interest once everything reads "optimal" — for them, £200 plus an ongoing subscription is poor value. For anyone in a risk group, though: only those who know their hypertension can fight it.