How we test

Diffuser marketing is full of claims that are hard to check from a product page: coverage figures measured in empty showrooms, battery lives measured on the lowest setting, oils that last "up to" a month. Our process is built around checking them.

Real homes, real time

Every unit runs in a reviewer's own home for at least 2 weeks. That means kitchens that smell of last night's dinner, hallways with draughts, radiators that throw scent around in winter, and bedrooms where subtle matters more than strong. Showroom conditions flatter every diffuser; houses do not.

What we measure

• Running cost per hour of scent, from measured oil consumption at the settings we actually used
• Coverage in practice, against the brand's claimed figure
• Battery life at everyday intensity, not the lowest setting
• Noise, at night, from the distance of a pillow
• Build quality: seams, threads, switches, and what a year of refills would do to them

Scores

Products are scored out of 5. A 4.5 or above means we would buy it with our own money and expect to still be pleased a year later. A 3 means it does the job with caveats worth knowing. Below 2.5, we would spend elsewhere. Half the battle is refill economics, and a beautiful machine with punishing oil prices will lose marks for it.

Independence

This site is operated commercially and has a partnership with Magnifiscent. That relationship is disclosed on every page, sponsored pages are labelled, and our testing notes and conclusions are our own. When a Magnifiscent product has a weakness we say so in the review, and when a competitor deserves to win a category, it wins. See our full disclosure.