Not ranked
Comparison · 2 models
Comparing 2 robot vacuums
Your shortlist side by side: today’s price, our score and every fact the maker states.
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- Cheapest today
- Best on the most facts
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- Highest score
Prices updated at 08:46
Side by side
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 | 84 €OTTO best | 132 €OTTO |
| Score | not in our ranking | |
| Rank | – | rank 1 of 1 for small rooms |
| Customer rating | – | – |
| Room size | ||
| Room size | – | small roomsup to 30 m² |
| Size, noise and age | ||
| Height lower is better | – | 27.4 cm |
| On the market since | – | August 2023 |
| Smart features and warranty | ||
| App control | – | Wi-Fi |
| Cleaning performance | ||
| Clean air delivery rate (CADR) | – | 140 m³/h |
| CADR measured to | – | Not stated |
| Room size we compare on | – | 12 m² |
| Room size the maker claims | – | 30 m² |
| Filter | ||
| HEPA filter class | – | H13 HEPA |
| Filter layout | – | One combined filter |
| Activated carbon filter | – | yes |
| Running costs | ||
| Filter life | – | 4 months |
| Noise and power | ||
| Noise at the lowest speed | – | 10 dB |
| Noise at the highest speed | – | 50 dB |
| Power at the highest speed | – | 22 W |
| Air quality sensing | ||
| Air quality sensors | – | PM2.5 |
| Automatic mode | – | yes |
| Build | ||
| Shape | – | Tabletop |
| Width | – | 206 mm |
| Depth | – | 206 mm |
| Weight | – | 1.9 kg |
| Extras | ||
| Ioniser | – | Can be switched off |
| Warranty and certification | ||
| Warranty | – | 2 years |
| Maker model numbers | – | CA-503B Compact Smart; CA-503T Compact Smart |
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.
Frequently asked questions
How big an air purifier do I need?
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.
What is the difference between HEPA H13 and True HEPA?
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.
Can an air purifier make ozone?
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.
Where we check prices
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.
Whose tests we use
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.
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