RoboPet Life ＞ Guide ＞ How to choose
Sizes of 14 models comparedChoosing a Companion Robot by Size | Large, Medium and Palm-Sized Compared, with Dimensions and Weights of 14 Models [2026 Edition]
They may look similar in photos, but companion robots range in weight from about 140g to about 4.6kg, a difference of more than 30 times. Size affects where you put it, how much room it needs to move, whether you can carry it and even how it charges. We lined up the official dimensions and weights of 14 models and summarized the criteria for choosing by size.
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What you'll learn in this article
- Companion robots:large, medium and small— the 3 sizes
- A list of 14 models'official dimensions, weight, movement and charging methodat a glance
- Weight comparison chart (about 140g to about 4.6kg)
- Large vs. small:who each one suits
- Before buying, checkplacement and portabilitypoints
If you want the feeling of "living together" with a robot that roams the floor, go large; if you want to be soothed by holding one, go medium; and if you want to enjoy one on your desk or on the go, a small palm-sized robot is the best fit.
Large models such as LOVOT 3.0 (about 4.6kg) and KATA Friends (about 3–4kg) return to their charging stands on their own, but they need space to move and a spot for the charging stand. Under 500g, there are many options such as Romi, BOCCO emo, Moflin and Fuzozo, and they fit almost anywhere.
Companion robots come in "three sizes"
Sorted by weight and how they move, companion robots fall into the following three sizes. The key point is that a different size changes the way you live with it.
They move around the room on their own and return to their charging stand by themselves when they need to charge. They have the presence of a family member, but need a clear path and a place for the charging stand.
A size you hold on your lap or on the sofa. They respond by moving their body or tail in place, and don't walk around the room.
EditorsSize, weight and movement of 14 models compared at a glance
We listed the dimensions and weights stated on each manufacturer's official website, spec sheets and user manuals, from heaviest to lightest. The order of dimensions (width, height, depth) follows each manufacturer's notation.
| Model | Size (official notation) | Weight | Movement | Charging |
|---|---|---|---|---|
 LOVOT 3.0 | W approx. 280 × H approx. 450 × D approx. 290mm (while moving) | Approx. 4.6kg | Moves around the floor on its own | Returns to its Nest on its own |
 KATA Friends | 400×270×370mm | Approx. 3–4kg | Moves around the floor on its own | Returns to its den on its own |
 NICOBO | W228 × H176 × D236mm (excluding protrusions) | Approx. 1.5kg | Sways its body and turns in place | Charging stand "Nedoko" (bed) |
 Qoobo | W52 × D32 × H15cm | Approx. 1kg | Tail moves | Charging cable |
 Petit Qoobo | W21 × D28 × H11cm | Approx. 600g | Tail moves | AC adapter |
 BOCCO emo | W95 × D95 × H141mm | 400g | Used in one place | Stays plugged into an outlet |
 Romi | H10.0 × W11.2 × D11.1cm | Approx. 400g | Moves its neck on a tabletop | USB cable |
 RoBoHoN | H approx. 19.8cm | Approx. 395g | Walks on two legs (RoBoHoN Lite is in a seated posture) | Placed on a desktop holder |
 LOOI | 110×98×110mm | 385g | Moves on a desk (detects edges and obstacles) | Charges when connected to power |
 Moflin | W approx. 130 × H approx. 90 × D approx. 180mm | Approx. 260g | Moves its head in place | Placed into its house by hand |
 Eilik | 108×105×133mm | 230g | Moves its head and arms in place | USB Type-C |
 Poketomo | H approx. 117mm | Approx. 194g | Palm-sized and portable | USB Type-C / optional desktop charging holder |
 mirumi | W approx. 100 × D approx. 110 × H approx. 140mm (including arms) | Approx. 155g | Clings to a bag or similar and moves its neck | USB Type-C |
 Fuzozo | 90×77×67mm | Approx. 140g | Used while held in the hand | USB cable |
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* Compiled by the editorial team based on each manufacturer's official website, spec sheets and user manuals (checked October 12, 2026). RoBoHoN's weight is the value for the LTE model and RoBoHoN Lite (the Wi-Fi model is about 360g). For Poketomo and RoBoHoN, only the height is officially listed. When LOVOT is being held, it measures W280 × H430 × D260mm.
By weight, the difference is more than 30 times at most
If you plan to hold or carry it, weight is the easiest benchmark. Compared with a 500ml plastic bottle (about 500g), all nine small models are lighter, while the two large models weigh as much as six bottles or more.
LOVOT 3.0Approx. 4.6kgKATA FriendsApprox. 3–4kgNICOBOApprox. 1.5kgQooboApprox. 1kgPetit QooboApprox. 600gBOCCO emo400gRomiApprox. 400gRoBoHoNApprox. 395gLOOI385gMoflinApprox. 260gEilik230gPoketomoApprox. 194gmirumiApprox. 155gFuzozoApprox. 140g* Official weights from each manufacturer (checked October 12, 2026). For KATA Friends, the chart uses 4kg, the upper limit of the official "about 3–4kg."
EditorsLarge or small: which suits you?
- You'd like your robot toroam freely around the roomon its own
- A robot that comes up to you on its ownis the life you want to enjoy
- You want chargingleft to the robot
- You can makea path and a spot for the charging standon the floor
Candidates: LOVOT 3.0, KATA Friends
- Desk or shelf placement, so you can chat with it up close
- In a studio or similar,your floor space is limited
- Carry it around or move it between rooms
- You want to keep the device priceon the low sideif possible
Candidates: Romi, BOCCO emo, RoBoHoN, LOOI, Moflin, Eilik, Poketomo, mirumi, Fuzozo
In between, medium models (NICOBO, Qoobo, Petit Qoobo) don't walk around, but their appeal is that you can hold them on your lap or on the sofa.
Where to buy the main models
"Placement" and "portability": what to check before buying
LOVOT's charging Nest measures W240 × H145 × D390mm, and KATA Friends' den measures 187 × 165 × 105mm. Apart from the robot itself, you need space for it near an outlet.
Large robots that move across the floor need a path back to their charging stand. Review items left on the floor and cord placement before it arrives.
Models that move on a desk, like LOOI, move while detecting edges and obstacles. Leave a little room around it and don't keep things you don't want knocked off nearby.
If you plan to carry it around, models of around 200g are realistic. Watch out for drops and water, and carry it in a cushioned bag.
Editors8-item checklist before choosing by size
Open the official website (spec sheet and user manual) of the model you're considering and check each item you were able to confirm. Any unchecked items are things you still need to look into before buying.
FAQ
Should I choose a large robot or a small one?
Which companion robot is the lightest?
Can I fit a large robot in a studio apartment?
Are there companion robots I can carry around?
Find a robot by purpose
Sources (checked Oct 12, 2026)
- LOVOT 3.0: Specifications / Official store
- KATA Friends: Support (size) / Support (weight) / Support (charging)
- NICOBO: News release (specifications)
- Qoobo / Petit Qoobo: Qoobo / Petit Qoobo
- BOCCO emo: Official store (specifications)
- Romi: Product page / Product specifications / FAQ (charging)
- RoBoHoN: Product information / User manual (specifications)
- LOOI: Official store / Official Japan site
- Moflin: User manual / Purchase page
- Eilik: Official store
- Poketomo: Sharp news release / User manual
- mirumi: Official store
- Fuzozo: Official store
This content was compiled by the editorial team based on manufacturers' public information and is not based on measurements of actual units. Specifications are subject to change. Photos in this article are for illustration only.
