Home Robot Vacuum Cleaners Irobot Roomba 621 Vs. Irobot Roomba 981

Irobot Roomba 621 Vs. Irobot Roomba 981 Review

8 minute read   Last updated on Mar 5, 2024
iRobot Roomba 621

iRobot Roomba 621

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Key features of the iRobot Roomba 621

Overall Score 6.4

  • Can Clean All Floor Types
  • Has Included Washable Filters
  • Battery Power of 4500 mAh
VS
iRobot Roomba 981

iRobot Roomba 981

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Key features of the iRobot Roomba 981

Overall Score 5.9

  • Battery Power of 3000 mAh

A summary by feature comparison

Category Features iRobot Roomba 621 iRobot Roomba 981
COMMONLY ASKED FOR FEATURES can clean all floor types
has mapping and navigation
has an obstacle sensor
works with alexa
compatible with google assistant
number of cleaning modes 3only 4only
warranty period 1year 1year
DESIGN FEATURES has included washable filters
dustbin capacity 0.5L 0.5L
automatically adjusts its height
indicates when full
weight 4.3kg 4kg
width 340mm 351mm
height 92mm 92mm
CLEANING PERFORMANCE AND POWER FEATURES battery power 4,500mAh 3,000mAh
operating time 1.5h 2h
charge time 3h 3h
operating power consumption 33W
has overheating indicator
has auto-off
has dirt sensor
OTHER FEATURES has problem area cleaning
has carpet detection
support a mobile application
doesn't get stuck
has route mapping
has voice prompts
supports auto docking
has anti-fall sensor
can be scheduled
supports wi-fi
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Let's look at each feature category in detail

Commonly Asked For Features

Can Clean All Floor Types

iRobot Roomba 621 can clean all floor types, this comes in handy, as different rooms inside a home may have various types of flooring i.e. carpets. When a robot vacuum is advertised able to clean all types of floors, this means that the vacuum is capable to clean flooring materials without much significant issues.

Has Mapping And Navigation

A robot vacuum's ability to generate a digital map of its cleaning space is one of the commonly asked-for features. This map allows the robot to "understand" the layout of the space. Mapping and navigation can be used for different situations, e.g. the iRobot Roomba 621 having the mapping feature can dedicate efficient cleaning in the mapped-out areas without accessing those that are not.

iRobot Roomba 981 also has the mapping and navigation feature, navigation involves how the robot vacuum moves around the space. Mapping and navigation often go hand in hand to help the vacuum move to the mapped-out spaces to be cleaned ignoring those that aren't.

Has An Obstacle Sensor

iRobot Roomba 621 has an obstacle sensor, such a sensor serves the purpose of detecting and identifying objects in the robot's route, allowing it to navigate around them and avoid collisions.

Also, the iRobot Roomba 981 has an obstacle sensor, obstacle sensors work together to provide the robot vacuum with a better understanding of its environment, enabling it to navigate around furniture, walls, and other objects when cleaning a room thus preventing damage to both the robot and its obstacles.

Works With Alexa

Most modern robot vacuum cleaners such as the iRobot Roomba 981 are designed to work with Amazon Alexa, which means that they can be integrated with the Amazon Echo ecosystem and programmed using voice commands.

Compatible With Google Assistant

The iRobot Roomba 981 is compatible with Google Assistant, allowing you to control it using voice commands through Google Home devices or the Google Assistant app found on smartphones and tablets.

Number Of Cleaning Modes

The iRobot Roomba 621 has 3 cleaning modes, the number of cleaning modes offered by robot vacuum cleaners can vary widely depending on the design of the robot vacuum.

The iRobot Roomba 981, having only 4 has more modes than the iRobot Roomba 621 with a difference of 1 Robot vacuum manufacturers offer different cleaning modes to provide users with flexibility and adaptability to different cleaning scenarios.

Warranty Period

iRobot Roomba 621 has a period of 1 year, this typically range from 1 year to 2 years, but some higher-end brands may offer longer warranties.

The iRobot Roomba 981, at 1 year has the same warranty period as that of iRobot Roomba 621. When considering a robot vacuum cleaner, it's important to read and understand the warranty terms and conditions, alongside any limitations or exclusions that may apply.

iRobot Roomba 621
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Design Features

Has Included Washable Filters

The iRobot Roomba 621 has washable filters, these are designed to capture dust, dirt, and fine particles during the cleaning process and can be easily removed and washed to maintain the vacuum's performance.

Dustbin Capacity

iRobot Roomba 621's dustbin capacity is at 0.5L, dustbin capacity indicates how much dust, dirt, and pet hair the robot vacuum holds before it requires to be emptied.

The iRobot Roomba 981, at 0.5L has the same dustbin capacity as the iRobot Roomba 621 The dustbin capacity can vary widely among robot vacuum models, and the size you choose should depend on your cleaning needs and the size of the area you want to clean.

Automatically Adjusts Its Height

Different floor types require a robot vacuum to be at a given ground clearance so as to optimize performance. The iRobot Roomba 621 can adjust its height to match this demand, for example, it may raise itself slightly when transitioning to a carpet to enable effective suction, and then lower itself on hard floors to ensure the brushes make good contact.

Indicates When Full

Most robot vacuum cleaners are equipped with sensors and indicators to notify users when the dustbin is full and needs to be emptied. iRobot Roomba 981 supports this feature, which prevents the robot vacuum from getting clogged which means performance will be maintained as soon as the bin is emptied.

Weight

The iRobot Roomba 621 weighs 4.3kg, robot vacuums are generally designed to be lightweight and compact to easily get around and portability.

iRobot Roomba 981, at 4kg is lighter than the iRobot Roomba 621 with a difference of 0.3kg. It's advisable to take in consideration the weight of the robot vacuum when selecting a model, and that's if you plan to carry it up and down stairs

Width

iRobot Roomba 621 has a width of 340mm, aslo known as its cleaning path width, is the width of the area that the robot vacuum can effectively clean in one go. The width of a robot vacuum is key as it can affect its efficiency and the time it takes to clean a space

The iRobot Roomba 981, at 351mm measures more in width than the iRobot Roomba 621 with a difference of 11mm. A wider cleaning path can cover more ground in a single pass, reducing the time it takes to clean a room.

Height

iRobot Roomba 621's height measures 92mm, here you are looking at the measure from the bottom of the robot vacuum to its highest point. Height is a key consideration, especially if you have obstacles with low clearance in your home.

iRobot Roomba 981, at 92mm has the same height as that of iRobot Roomba 621. When choosing a robot vacuum, ensure that the robot vacuum can go under the furniture and navigate effectively in your living space without getting stuck or causing damage.

Cleaning Performance And Power Features

Battery Power

The battery power of a robot vacuum cleaner is important as it determines how long the vacuum can operate on a single charge. Battery capacity is measured in milliampere-hours (mAh), iRobot Roomba 621's battery power is 4,500mAh

iRobot Roomba 981, at mAh3,000 has less battery power than the iRobot Roomba 621 by only A bigger capacity implies longer battery life which can be of advantage if you have a large home or if you would like the robot vacuum to complete operations with fewer interruptions to recharge.

Operating Time

The operating time of the iRobot Roomba 621 refers to the amount of time the vacuum can clean continuously on a single charge before it needs to return to its charging dock for recharging. iRobot Roomba 621's operating time is 1.5h

The iRobot Roomba 981, at 2h lasts more than the iRobot Roomba 621 with a difference of 0.5h Always plan cleaning cycles around the vacuum's operating time to maximize efficiency and prevent "incomplete work" between charge intervals.

Charge Time

iRobot Roomba 621 has a charge time of 3h, the charge time of a robot vacuum cleaner refers to the amount of time it takes for the vacuum's battery to recharge fully after it has been depleted during a cleaning cycle.

The iRobot Roomba 981, at 3h has the same charge time as the iRobot Roomba 621. Charge time is an important factor to consider when choosing a robot vacuum, as it determines how long you'll need to wait before the vacuum begins its next cleaning cycle.

Operating Power Consumption

This is the amount of electrical power the vacuum uses while it's actively cleaning your home. iRobot Roomba 621 has a power consumption of 33W, power is measured in watts (W) and can vary among different robot vacuum models based on several consuption factors.

Has Overheating Indicator

An overheating indicator in a robot vacuum serves several key purposes, making it a valuable safety feature. It helps protect the iRobot Roomba 621 from damage by detecting when key components, such as the motor or battery, are operating at temperatures that could cause harm.

Has Auto-Off

This feature is designed to automatically turn off the vacuum after it has completed a cleaning cycle or when specific conditions occur. iRobot Roomba 621 has an auto-off feature, which is useful for energy efficiency and battery preservation.

Also, iRobot Roomba 981 supports this feature, overall, the auto-off feature in a robot vacuum is a key addition that in a way promotes energy efficiency, prolongs the vacuum's lifespan, enhances safety, and adds convenience to the cleaning operations.

Has Dirt Sensor

iRobot Roomba 621 has a dirt sensor, dirt sensors are designed to detect the concentration of dirt, dust, or debris in the space being cleaned and based on their readings adjust the vacuum's cleaning behavior during operation.

iRobot Roomba 621
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Other Features

Has Problem Area Cleaning

This feature allows you to instruct a robot vacuum to focus on cleaning a specific spot in your home, the iRobot Roomba 621 supports this, which can be particularly useful for dealing with localized messes or busy areas.

Has Carpet Detection

iRobot Roomba 621 has carpet detection, which allows the vacuum to detect and adjust to different floor surfaces, to be specific recognizing when it transitions from hard floors like tile to carpets.

Support A Mobile Application

iRobot Roomba 981 supports a smartphone app, through which you can control and monitor the vacuum without getting to it physically but through your smartphone or tablet.

Doesn't Get Stuck

This feature in robot vacuum cleaners is intended to reduce the likelihood of the robot vacuum getting stuck during cleaning. Robot vacuums such as the iRobot Roomba 621 are equipped with various sensors and technologies to move around obstacles and avoid getting trapped, but the effectiveness of this feature varies among different models.

Both the iRobot Roomba 981 and iRobot Roomba 621 have the "anti-stuck" feature, but clearing clutter, ensuring proper cable management, and creating clear paths for the vacuums can help further reduce the chances of becoming stuck during cleaning.

Has Route Mapping

iRobot Roomba 621 has a route mapping feature which enables it to generate a map of your home and schedule efficient cleaning routes. This mapping capability improves the vacuum's ability to clean effectively and systematically.

Route mapping is an important feature as it makes it possible for robot vacuums such as the iRobot Roomba 981 to adapt to the layout of your space to work more efficiently and minimize the possibility of missing certain spots.

Has Voice Prompts

Voice prompts refer to notifications that the vacuum states to give you information on the different states of the vacuum. iRobot Roomba 981 supports this feature

Supports Auto Docking

Auto-docking is a feature that refers to the vacuum's ability to autonomously return to its docking station when certain conditions are met such as done with cleaning, battery running low, or any malfunction.

Both iRobot Roomba 981 and iRobot Roomba 621 support this feature, considered a convenient feature because it makes sure that the robot vacuum keeps its charge and readiness for cleaning without requiring manual intervention.

Has Anti-Fall Sensor

Most robot vacuum cleaners such as iRobot Roomba 621 come equipped with an "cliff detection" feature. This feature is designed to save the robot vacuum from falling off stairs, ledges, or other elevated surfaces, hence its safety during operation.

This safety feature that is also available on the iRobot Roomba 981 is key in avoiding accidents and protecting the robot vacuum from damage. It gives you peace of mind by ensuring that the vacuum will not fall down a flight of stairs during its cleaning cycle.

Can Be Scheduled

iRobot Roomba 621 has this convenient feature, which allows you to set certain days or times of day for the robot vacuum to start working.

This feature in robot vacuums is particularly useful in keeping a consistently clean space with little or no manual intervention. iRobot Roomba 981 too allows scheduling.

Supports Wi-Fi

iRobot Roomba 981 supports Wi-Fi, Wi-Fi-enabled robot vacuums offer several advantages and features, such as remote control, mobile app integration, voice assistant compatibility, and remote monitoring.

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