Comparison · 2 models
Your shortlist side by side: today’s price, our score and every fact the maker states.
Prices updated at 08:46
Green is the best of these 2, also when they share the lead.
Drag a model by its header to move its column, or use the arrows.
| | | |
|---|---|---|
| Price and ranking | ||
| Lowest price | – | 132 €OTTO |
| Score | not in our ranking | |
| Rank | – | rank 1 of 1 for small rooms |
| Customer rating | – | – |
| Room size | ||
| Room size | open-plan spacesup to 80 m² | small roomsup to 30 m² |
| Size, noise and age | ||
| How tall the purifier is. It decides whether it fits on a shelf or under a window sill. In this comparisonWhen it matters
| 62 cm | 27.4 cm best |
| On the market since | November 2025 | August 2023 |
| Smart features and warranty | ||
| App control same on both | Wi-Fi | Wi-Fi |
| Matter is the standard that lets devices from different makers work together. With it you can run the robot outside the maker’s own app. Matter | no (assumed) | – |
| Cleaning performance | ||
| How much clean air the purifier delivers an hour, measured with smoke, dust and pollen. A higher figure cleans a bigger room or the same room faster. In this comparison | 600 m³/h | 140 m³/h |
| The room size where the purifier changes the air 4.8 times an hour under a 2.5 m ceiling, worked out from its CADR. We use it so every model is compared on the same rule. In this comparison | 50 m² | 12 m² |
| The room size the maker states. Makers use different rules, so we show it but never rank on it. In this comparison | 80 m² | 30 m² |
| The test the CADR comes from. AHAM AC-1 and the DOE test are independent and comparable. A maker's own test is not. CADR measured to | – | Not stated |
| Filter | ||
| How fine the filter is. True HEPA and H13 catch at least 99.97% of particles at 0.3 microns. HEPA-type is a weaker claim with no test behind it. HEPA filter class same on both | H13 HEPA | H13 HEPA |
| A filter of activated carbon that takes out smells and some gases. It does not catch particles. Activated carbon filter same on both | yes | yes |
| Whether the particle and carbon layers are one filter or separate ones. Separate filters let you replace only the part that is spent. Filter layout | – | One combined filter |
| Running costs | ||
| How long the maker says a filter lasts, in months of normal use. A filter that is spent cleans less. Filter life | – | 4 months |
| Noise and power | ||
| The power the purifier draws at its highest speed. In this comparison | 68 W | 22 W |
| The sound level at the lowest speed, as the maker measures it. Noise at the lowest speed | – | 10 dB |
| The sound level at the highest speed, as the maker measures it. Noise at the highest speed | – | 50 dB |
| Air quality sensing | ||
| What the purifier measures in the air. A particle sensor lets it speed up and slow down by itself. Air quality sensors same on both | PM2.5 | PM2.5 |
| The fan speed follows the air quality the sensor reads. Automatic mode | – | yes |
| Build | ||
| Shape | Floor box | Tabletop |
| Also works as | Humidifier | – |
| Width | 320 mm | 206 mm |
| Depth | 320 mm | 206 mm |
| What the purifier weighs. It counts most if you move it from room to room. In this comparison | 7 kg | 1.9 kg |
| Extras | ||
| An ioniser charges particles so they settle. Some also make a little ozone, which is why a switch to turn it off matters. Ioniser | – | Can be switched off |
| Warranty and certification | ||
| Maker model numbers | COP002398 | CA-503B Compact Smart; CA-503T Compact Smart |
| The warranty the maker gives in Germany. Consumer law here stands apart from it and can last longer. Warranty | – | 2 years |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
The score is out of 10: 60% measured facts and 40% shop ratings. A model is ranked only when its CADR is known. Method. Models whose CADR we do not hold yet, so they are not in our ranking. We do track their prices.
Lowest price at every shop that delivers to Germany, VAT and delivery included. * = delivery cost and VAT estimated for a foreign shop.
Robot vacuum market report, September 2026 A median price of – and 0 new models.
The models in our ranking run from about 189 € to 443 € today. We show the lowest verified price of the day per model, VAT and delivery included.
Match it to the size of the room. Each model in the ranking is grouped by the room size its maker states, and the lists keep a model out when it states none. A common rule of thumb is a clean air delivery rate (CADR) in m³/h of at least 12 times the room’s floor area in m², for a ceiling of 2.4 metres.
Both are high-efficiency filters. True HEPA is the American name for a filter that catches 99.97% of particles of 0.3 micrometres, and H13 is the European class for 99.95%. We read the class the maker states and do not treat a filter called HEPA-type or HEPA-like as either.
Some can, mostly models with an ioniser or a plasma feature. California limits ozone from indoor air cleaners to 50 parts per billion, and the CARB certification shows a model meets that limit. Our asthma filter leaves out models whose ioniser cannot be switched off.
Every day, at every shop we follow. We read the prices from the shops’ own product feeds and web shops. We check them for errors and keep them, so every product page shows what a price did over the last 90 days. We only call a discount real when the price also sits below the level of the preceding 30 days. We link to Amazon too, but show no Amazon price until we read it through Amazon’s own API. Until then the price is on Amazon itself. Per shop: how and how often
We read prices every day at most shops, from their product feed or web shop. We check them for errors and keep them, so you can see what a price did over the last 90 days. We link to Amazon too, but show no Amazon price until we read it through Amazon’s own API. Until then the price is on Amazon itself.
Beside each model we also show where these testers place it in their own lists, without counting it in the score:
How we combine measured facts and owners’ ratings into one score is on the method page.
Looking for a bargain? The air purifiers with a real price drop today →
Looking for something new? The air purifiers launched in the past year →
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