# Dreame D20 Air Plus vs Dreame L40s Ultra

As of Nov 4, 2026, the Dreame D20 Air Plus costs $350 and the Dreame L40s Ultra costs $500, so the Dreame D20 Air Plus is $150 cheaper. The Dreame L40s Ultra has a published review score and ranks #6 in our robot vacuums ranking; the Dreame D20 Air Plus is not scored yet. Pick the Dreame D20 Air Plus for hard floor homes on a budget that want auto empty. Pick the Dreame L40s Ultra for pet owners with carpet on a budget.

Prices checked Nov 4, 2026. HTML version: https://robotsforthat.com/vs/dreame-d20-air-plus-vs-dreame-l40s-ultra/

## Side by side

| | Dreame D20 Air Plus | Dreame L40s Ultra |
|---|---|---|
| Price | $350 | $500 |
| 3 year cost | $350 | $500 |
| Our score | Not scored yet | 8.8/10 |
| Rank in Floors | #53 | #6 |
| Status | on sale | on sale |
| Warranty | 3 years (Dreame US store) | 3 years (Dreame US store) |
| Suction | 20,000 Pa claimed (Dreame), with Quiet, Standard, Intense and Max levels (PCWorld) | 19,000 Pa claimed (Dreame); Vacuum Chef measured 490 FPM carpet airflow, well above average |
| Navigation | LiDAR with up to 4 saved maps, 3D map and no go zones (Dreame); Android Authority found it navigates well and rarely hit furniture | LDS LiDAR with Pathfinder, 4 maps (Dreame); Vacuum Wars measured 0.85 m2 per minute |
| Obstacle avoidance | No camera; LiDAR, front bumper and cliff sensors only (Android Authority, PCWorld). Android Authority saw it shove a plastic tub and fold a small mat | 3D structured light only, no camera or object count (Dreame); Vacuum Wars saw it avoid 7 of 24 objects |
| Mopping | Yes, flat pad with a 280 mL water tank (Dreame) and 32 water levels (Android Authority); no mop lift and no pad washing in the dock (PCWorld) | Dual spinning mops, 10.5 mm lift, extend and auto removal (Dreame); Vacuum Wars measured 0.95 g water left and a 259 combined mop score |
| Self empty | Yes, 4 L dust bag, up to 120 days per Dreame in house lab calculation | Yes, 3.2 L dust bag, up to 100 days (Dreame) |
| Dock features | Auto empty and charging only; small dock at 293 x 201 x 266.5 mm (Dreame) with a power switch on the back (PCWorld) | Auto empty, 167 F (75 C) hot water mop wash, hot air drying, self cleaning washboard, auto detergent and water refill, 4.5 L clean and 4.0 L dirty tanks; water hookup kit sold separately (Dreame) |
| Runtime | Up to 150 min from a 3,200 mAh battery, about 140 m2 in quiet mode (Dreame); Android Authority cleaned about 463 sq ft in about 57 min using 73% battery | Up to 220 min in quiet mode from 5,200 mAh (Dreame); Vacuum Wars estimated about 1,935 sq ft per charge |
| Dustbin | 220 mL robot bin (Dreame) plus 4 L dock bag | 310 ml robot bin plus 3.2 L dock bag (Dreame) |
| Height | 94.7 mm, about 3.7 in (Dreame; Android Authority also measured 3.7 in) | 3.82 in (Dreame) |
| Pet hair | PCWorld said it picked up its greyhound's hair; no review measured pet hair pickup | HyperStream Detangling DuoBrush (Dreame); Vacuum Wars measured 91% pet hair pickup, 92% carpet sand removal and 0% hair wrap |
| App | Dreame app with carpet settings, floor direction, 3D maps, zones and no go areas; works with Alexa, Google Home and Siri (Dreame) | Dreamehome app with third party voice assistants only (Dreame); Vacuum Chef notes no built in voice assistant or live video |
| Noise | No dB figure from Dreame; Android Authority and PCWorld both found it louder than average for a robot, and louder on carpet (PCWorld) | Vacuum Chef measured 78 dB at max suction |
| Threshold | n/a | 1.57 in double layer and 0.87 in single steps (Dreame) |
| Best for | hard floor homes on a budget that want auto empty | pet owners with carpet on a budget |
| Skip if | you need real mopping or camera obstacle avoidance | your floor often has cables, socks or toys |

## What reviewers found

### Dreame D20 Air Plus

- Android Authority: Tested at home over several runs: cleaned about 400 sq ft in 48 min on 80% battery, then about 463 sq ft in 57 min on 73%. Navigation was good, but it shoved angled leg items and folded a small mat. Mop works only as a damp touch up. Given the AA Recommended badge, no numeric score. [Source](https://androidauthority.com/dreame-d20-air-plus-review-3705125)
- PCWorld: Tested in a split level home on hard floors and rugs: good vacuuming for the price, picked up greyhound hair, cleaned under a low entertainment center and finished a downstairs area in about 33 min with 77% battery left. It repeatedly nudged a mat and the mop is basic. [Source](https://www.pcworld.com/article/3191770/dreame-d20-air-plus-review.html)

### Dreame L40s Ultra

- Vacuum Wars (3.51 Vacuum Wars stars): 92% carpet sand removal, 91% pet hair pickup and 0% hair wrap with the DuoBrush, about 1,935 sq ft per charge, but only 7 of 24 obstacles avoided. [Source](https://vacuumwars.com/dreame-l40s-series-review/)
- Vacuum Chef (95/100): Scored 95/100 in its real world cleaning tests, measured 490 FPM carpet airflow and 78 dB at max suction. Obstacle avoidance varied by floor and object. [Source](https://vacuumchef.com/dreame-l40s-ultra-review-powerful-suction-smart-mopping-real-world-performance-tested/?amp=1)

## Questions buyers ask

### Which is better, the Dreame D20 Air Plus or the Dreame L40s Ultra?

The Dreame L40s Ultra has a published review score and ranks #6 in our robot vacuums ranking; the Dreame D20 Air Plus is not scored yet. Pick the Dreame D20 Air Plus for hard floor homes on a budget that want auto empty. Pick the Dreame L40s Ultra for pet owners with carpet on a budget.

### Which is cheaper?

The Dreame D20 Air Plus at $350, versus $500 for the Dreame L40s Ultra, checked Nov 4, 2026. Over 3 years with running costs: $350 vs $500.

### What is the difference between the D20 Air Plus and the L40s Ultra?

Suction: 20,000 Pa claimed (Dreame), with Quiet, Standard, Intense and Max levels (PCWorld) on the D20 Air Plus, 19,000 Pa claimed (Dreame); Vacuum Chef measured 490 FPM carpet airflow, well above… on the L40s Ultra. Navigation: LiDAR with up to 4 saved maps, 3D map and no go zones (Dreame); Android Authority found… on the D20 Air Plus, LDS LiDAR with Pathfinder, 4 maps (Dreame); Vacuum Wars measured 0.85 m2 per minute on the L40s Ultra. Obstacle avoidance: No camera; LiDAR, front bumper and cliff sensors only (Android Authority, PCWorld)… on the D20 Air Plus, 3D structured light only, no camera or object count (Dreame); Vacuum Wars saw it avoid 7… on the L40s Ultra.

Full reviews: [Dreame D20 Air Plus](https://robotsforthat.com/robot/dreame-d20-air-plus/index.md), [Dreame L40s Ultra](https://robotsforthat.com/robot/dreame-l40s-ultra/index.md)