No, they are not the same, although the two end products are similar enough that people use the words interchangeably. Reverse osmosis pushes water through a membrane at pressure and leaves the rejected material behind in a brine stream. Distillation boils water into vapour and condenses it back, leaving whatever cannot evaporate in the boiling chamber.
Two different separations
A membrane separates by size and charge: dissolved salts, metals and larger organic molecules are rejected while water passes. Distillation separates by boiling point: anything that will not evaporate at the water's boiling temperature stays behind. That difference matters at the edges. Volatile organic compounds that boil below water can carry over in a still unless it vents them, while a membrane rejects a broad range of dissolved solids but is degraded by chlorine, which is why carbon sits in front of it.
How the results compare in practice
Both produce water with very low dissolved mineral content, so both taste flat and both leave no scale in a kettle. Distilled water is generally the lower of the two in dissolved solids, since a good still leaves essentially everything non volatile behind. A well maintained RO unit gets close, and a worn membrane does not, which is the crucial practical difference: RO performance degrades silently while a still either boils or does not.
How they differ to own
An RO system plumbs in under a sink, produces water continuously into a small tank, sends a reject stream to the drain, and needs prefilter and membrane changes. A countertop distiller sits on the bench, makes a batch at a time on a cycle measured in hours, uses electricity for every gallon, and needs the boiling chamber descaled by hand. For a household drinking several gallons a day, RO wins on convenience; for occasional small batches a still is simpler to own.
Which to buy for a household
If the goal is better drinking and cooking water at the kitchen sink, an RO system is almost always the practical answer because it delivers on demand and never asks you to plan ahead. Buy a distiller when you specifically need small volumes of very low mineral water and do not want plumbing work. Our best reverse osmosis water filter guide covers the stage counts and membrane ratings worth comparing.
Questions people ask about is reverse osmosis the same as distilled water
Which is purer, RO or distilled water?
Distilled is usually marginally lower in dissolved solids, but a well maintained RO system is close enough that the difference rarely matters at home.
Can I use RO water where distilled water is specified?
Often yes for appliances such as steam irons and humidifiers, but follow the maker's instructions where the specification is part of a warranty condition.
Do both remove minerals from water?
Yes. Both leave water low in calcium and magnesium, which is why both taste flat and neither leaves scale behind in a kettle.