Home Robot Vacuum Cleaners Irobot Roomba 976 Vs. Irobot Roomba 621

Irobot Roomba 976 Vs. Irobot Roomba 621 Review

8 minute read   Last updated on Mar 5, 2024
iRobot Roomba 976

iRobot Roomba 976

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Key features of the iRobot Roomba 976

Overall Score 6.7

  • Can Clean All Floor Types
  • Has Included Washable Filters
  • Battery Power of 2130 mAh
VS
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

A summary by feature comparison

Category Features iRobot Roomba 976 iRobot Roomba 621
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 3only
warranty period 2year 1year
DESIGN FEATURES has included washable filters
dustbin capacity 0.6L 0.5L
automatically adjusts its height
indicates when full
weight 4kg 4.3kg
width 350mm 340mm
height 92mm 92mm
CLEANING PERFORMANCE AND POWER FEATURES battery power 2,130mAh 4,500mAh
operating time 1.25h 1.5h
charge time 3h 3h
operating power consumption 33W 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
supports virtual barriers
has route mapping
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 976 cleans all floor types, this feature is essential, since different rooms within your home may have various types of flooring i.e. carpets. When a robot vacuum is said to be able to clean all floor types, this means that the vacuum is designed and equipped to clean flooring materials without much significant issues.

iRobot Roomba 621 can also clean all floor types, meaning it is built to be versatile, providing effective cleaning results on either carpets or hard floors found in most homes.

Has Mapping And Navigation

A vacuum's ability to create a digital map of its cleaning area is one of the commonly asked-for features. The map it creates allows the robot to keep a record of the layout of the space. This 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.

Has An Obstacle Sensor

iRobot Roomba 976 has an obstacle sensor, this serves the purpose of detecting and identifying obstacles in the robot's way, this allwos it to navigate around them thus avoiding collisions.

Also, the iRobot Roomba 621 has this sensor, obstacle sensors work together to provide the robot vacuum with a comprehensive understanding of its environment, making it possible to navigate around furniture, walls, and other objects when cleaning a room thus avoiding damage to both the robot and its obstacles.

Works With Alexa

Most modern robot vacuum cleaners such as the iRobot Roomba 976 are built to work with Amazon Alexa, which implies that they can be integrated with the Amazon Echo ecosystem and programmed using voice commands.

Compatible With Google Assistant

iRobot Roomba 976 is compatible with Google Assistant, enabling you to control it using voice commands through Google Home devices or the Google Assistant app installed on smartphones and tablets.

Number Of Cleaning Modes

The iRobot Roomba 976 has 3 cleaning modes, the cleaning modes offered by robot vacuum cleaners can vary widely depending on the design of the robot vacuum.

The iRobot Roomba 621, having only 3 has the same number of cleaning modes as the iRobot Roomba 976 Robot vacuum manufacturers may offer different cleaning modes to provide users with flexibility and adaptability to various cleaning challenges.

Warranty Period

iRobot Roomba 976 has a period of 2 year, warranty periods typically range from 1 - 2 years, however some higher-end models may give longer warranty periods.

iRobot Roomba 621, at 1 year has a shorter warranty period than the iRobot Roomba 976 by 1 year. 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 976
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Design Features

Has Included Washable Filters

iRobot Roomba 976 has washable filters, these are designed to capture dust, dirt, and fine particles during the cleaning process and can be easily removed and cleaned to maintain the vacuum's performance.

iRobot Roomba 621 comes with washable filters, the advantage of washable filters is that they can be cleaned and reused multiple times, reducing the ongoing cost of replacing disposable filters, plus it's also good environmentally.

Dustbin Capacity

The iRobot Roomba 976's dustbin capacity is at 0.6L, dustbin capacity determines how much dust, debris, and pet hair the vacuum holds before it can be emptied.

iRobot Roomba 621, at 0.5L carries less dirt than the iRobot Roomba 976 with a difference of only 0.1L The dustbin capacity varies widely among robot vacuum models, and the capcity 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 adjusts 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 make sure the brushes make good contact.

Indicates When Full

Many robot vacuum cleaners are equipped with sensors and indicators to alert users when the dirt collection container is full and needs to be emptied. iRobot Roomba 976 supports this feature, which prevents the robot vacuum from getting clogged thus performance will be maintained as soon as the bin is emptied.

Weight

iRobot Roomba 976 weighs 4kg, robot vacuums are generally designed to be lightweight and compact for easy maneuverability and carrying around.

iRobot Roomba 621, at 4.3kg weighs more than the iRobot Roomba 976 by 0.3kg. It's advisable to consider the weight of the vacuum when getting a model, especially if you plan to carry it up and down stairs

Width

iRobot Roomba 976 has a width of 350mm, often referred to as its cleaning path width, is the width of the area that the robot vacuum can properly clean in one go. The width of a robot vacuum is important as it can affect its efficiency and the time it takes to clean a room

iRobot Roomba 621, at 340mm measures less in width than the iRobot Roomba 976 with a difference of 10mm. A wider cleaning path can cover more ground in a single pass, shortening the time it takes to clean a room.

Height

iRobot Roomba 976's height measures 92mm, here you are considering the measure from the bottom of the robot vacuum to its highest point. Height is an important consideration, especially if you have obstacles with low clearance in your home.

The iRobot Roomba 621, at 92mm has the same height as that of iRobot Roomba 976. When selecting 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 a crucial factor that determines how long the vacuum can run on a single charge. It is measured in milliampere-hours (mAh), iRobot Roomba 976's battery power is 2,130mAh

iRobot Roomba 621, at mAh4,500 has more battery power than the iRobot Roomba 976 by A bigger capacity implies longer battery life which can be beneficial if you have a large room or if you prefer the robot vacuum to complete operations without frequent interruptions to recharge.

Operating Time

The operating time of a robot vacuum cleaner refers to the time the vacuum can clean continuously on a single charge before it needs to be recharged. iRobot Roomba 976's operating time is 1.25h

The iRobot Roomba 621, at 1.5h lasts more than the iRobot Roomba 976 with a difference of 0.25h Always plan cleaning cycles around the vacuum's operating time to maximize efficiency and prevent "incomplete work" between charge intervals.

Charge Time

iRobot Roomba 976 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 621, at 3h has the same charge time as the iRobot Roomba 976. 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 is ready for its next cleaning cycle.

Operating Power Consumption

The operating power consumption of a robot vacuum cleaner refers to the amount of electrical power the vacuum uses while it's actively cleaning your home. iRobot Roomba 976 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.

iRobot Roomba 621, at 33W has the same power consumption as that of iRobot Roomba 976. Lower power consumption is more energy-efficient and cost-effective over time, but it may also affect cleaning performance, especially on carpets.

Has Overheating Indicator

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

Has Auto-Off

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

Has Dirt Sensor

iRobot Roomba 976 has a dirt sensor, dirt sensors are designed to detect the concentration of dirt, dust, or debris in the room being cleaned and based on their readings adjust the vacuum's cleaning behavior during cleaning cycle.

You may want to consider buying either the iRobot Roomba 621 or iRobot Roomba 976 If you value the ability to automatically adjust the cleaning modes of the robot vacuum based on the level of dirt and debris in your room.

iRobot Roomba 976
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Other Features

Has Problem Area Cleaning

This feature allows you to program a robot vacuum to focus on cleaning a specific spot in your home, the iRobot Roomba 621 supports this, which can be really useful for dealing with particular area messes or high-traffic areas.

Has Carpet Detection

iRobot Roomba 976 has carpet detection, which allows the vacuum to identify and adjust to different floor surfaces, to be specific recognizing when it transitions from hard floors like tile to areas with carpets.

This feature is intended to improve cleaning performance and also ensure that the vacuum adjusts its settings appropriately when cleaning carpeted areas. Robot vacuums with a carpet detection feature such as the iRobot Roomba 976 and iRobot Roomba 621 use sensors to detect surfaces, allowing them to make required adjustments for efficient cleaning.

Support A Mobile Application

iRobot Roomba 976 supports a smartphone app, through which you can control and monitor the vacuum remotely through your smartphone or tablet.

Doesn't Get Stuck

This feature in robot vacuum cleaners is designed to reduce the chance of the robot vacuum becoming stuck during cleaning. Robot vacuums such as the iRobot Roomba 976 are equipped with various sensors and technologies to navigate around obstacles and avoid getting trapped, however the effectiveness of this feature varies among different models.

Both the iRobot Roomba 621 and iRobot Roomba 976 have the "anti-stuck" feature, however clearing clutter, ensuring proper cable management, and creating clear paths for the vacuums can help further eliminate the chances of becoming stuck while cleaning.

Supports Virtual Barriers

Virtual barriers are set up and managed via the robot vacuum's mobile app, similar to no-go zones, these barriers are designed to enable you control and restrict where the robot vacuum can and cannot go during cleaning.

Has Route Mapping

iRobot Roomba 976 has a route mapping feature that enables it to create a map of your space and plan 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 621 to adapt to the layout of your space to work more efficiently and minimize the possibility of missing certain spots.

Supports Auto Docking

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

Both iRobot Roomba 621 and iRobot Roomba 976 support this feature, considered a convenient feature because it ensures that the robot vacuum maintains its charge and readiness for cleaning with little or no manual intervention.

Has Anti-Fall Sensor

Most robot vacuum cleaners such as iRobot Roomba 976 come having an "anti-fall" feature. This feature is designed to prevent the robot vacuum from falling off stairs, ledges, or other elevated surfaces, hence its safety while cleaning.

This safety feature that is also available on the iRobot Roomba 621 is key in mitigating accidents and keeping the robot vacuum from damage. It gives you peace of mind knowing that the vacuum will not fall off a ledge during its cleaning cycle.

Can Be Scheduled

iRobot Roomba 976 has this convenient feature, which allows you to set specific days or times of day for the robot vacuum to start cleaning your space.

The scheduling feature in robot vacuums is particularly useful in maintaining a consistently clean home with little or no manual intervention. iRobot Roomba 621 too can be scheduled.

Supports Wi-Fi

iRobot Roomba 976 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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