Hi there! We're here to help you decide between the Britax Poplar and the Diono Radian 3RXT Safe+.
Our goal is to provide you with the information you need to feel confident that you're choosing the optimal car seat for your family's needs and budget. Let us know if you have any other questions!
At A Glance
Britax Poplar | Diono Radian 3RXT Safe+ | |
Type |
Convertible Rear-Facing Forward-Facing |
Convertible Rear-Facing Forward-Facing High Back Booster Backless Booster |
Current price |
Currently unavailable
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Currently unavailable
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Rating | 4.68 | 4.58 |
Our Thoughts
The Britax Poplar and the Diono Radian 3RXT Safe Plus are both versatile convertible car seats, designed to provide comfortable and secure transport for your child as they grow. However, each has its own strengths, considerations, and unique features that may suit different family needs and preferences.
The Britax Poplar earns praise not only for its robust safety features, but also for its user-friendly design, notably the ClickTight installation system. This system trades the normal struggle of securing the car seat into a vehicle for a relatively simple process, which busy parents will certainly appreciate. With a reputation for safety, comfort, and quality, the Poplar ensures your child's journey is enjoyable, whether it's a short ride to the grocery store or a long road trip. It's particularly useful for families with compact cars due to its slim profile. However, this model does have a weight limit to consider; it supports rear-facing use up to 50 pounds and forward-facing use up to 65 pounds.
On the other hand, the Diono Radian 3RXT Safe Plus reveals its advocates among larger families and those with multiple children. Its narrow design allows up to three seats to fit across in most vehicles—no simple feat. Practicality is paired with impressive safety features, including a steel-reinforced frame and comprehensive protection measures for any potential collision. Notably, this car seat offers an extended weight limit; it can be used rear-facing up to 50 pounds, forward-facing up to 65 pounds, or as a booster seat up to 120 pounds. This broad range signals the Radian 3RXT Safe Plus's longevity—it can grow with your child for years. However, some parents found that the installation and reassembly of the seat, especially after cleaning the cover, can be a bit challenging.
In the end, your choice between the Britax Poplar and the Diono Radian 3RXT Safe Plus may come down to the specifics of your family's situation. If convenience in installation and a more space-efficient design are among your top needs, the Britax Poplar could serve you well. Alternatively, if you're seeking a car seat that can accommodate your growing child for a longer period and handle the demands of a full car's worth of child seats, the Diono Radian 3RXT Safe Plus may be the way to go. Both seats showcase significant merits in comfort, safety, and adaptability, promising high-quality transportation for your child.
Key Details
Poplar | Radian 3RXT Safe+ | |
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Brand | Britax | Diono |
Type |
Convertible Rear-Facing Forward-Facing |
Convertible Rear-Facing Forward-Facing High Back Booster Backless Booster |
Weighted Rating | 4.68 | 4.58 |
1 yr Price Range | $299.99 - $299.99 | $259.99 - $349.99 |
Current price |
Currently unavailable
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Currently unavailable
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Value |
![]() Offers a robust set of features at a competitive price point, balancing quality and cost effectively. |
![]() Offers robust safety features and long-term usability, justifying its price. |
Safety |
![]() Safety is a hallmark of Britax, and the Poplar is no exception, with its sturdy construction and reliable performance in safety tests. |
![]() Steel-reinforced frame and comprehensive protection measures are a standout. |
Features |
![]() With its convertible design and user-friendly installation, the Poplar stands out in its category. |
![]() The 12-position headrest and machine-washable cover add notable convenience. |
Installation |
![]() The ClickTight system is frequently praised for its simplicity and effectiveness, making installation a breeze. |
![]() Installation and reassembly, especially of the seat cover, are noted as challenging. |
Cleaning |
![]() The seat is designed with easy-to-remove fabrics for convenient cleaning, which is a boon for busy parents. |
![]() The machine-washable cover is practical, but reinstallation can be cumbersome. |
Size |
![]() The slim profile of the Poplar is advantageous for fitting into compact cars without compromising on comfort or safety. |
![]() Its narrow design is ideal for fitting multiple car seats in a vehicle. |
Review | Click here | Click here |
Comparison of Specifications
While features and reviews provide a sense of real-world use, the specs offer quantifiable details on sizing, limitations, and more. Comparing key measurements and ranges side-by-side is crucial for ensuring you choose a seat properly fitted for your child and vehicle.
We've compiled the weight limits, height limits, dimensions, and other vital statistics for the Britax Poplar and the Diono Radian 3RXT Safe+. This data will confirm whether each seat can accommodate your child's current size and projected growth. Specs like seat depth and width are also important for assessing fit with your car's backseat.
Review the following key measurements for both seats. Pay special attention to the height and weight limits to ensure your child falls within the safe ranges.
Height and Weight Limits
Rear-facing
Britax Poplar | Diono Radian 3RXT Safe+ | |
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Height Range | 0 - 49 inches | 18 - 44 inches |
Weight Range | 5 - 50 pounds | 4 - 50 pounds |
Forward-facing
Britax Poplar | Diono Radian 3RXT Safe+ | |
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Height Range | 0 - 49 inches | 30 - 57 inches |
Weight Range | 22 - 65 pounds | 22 - 65 pounds |
Booster
Britax Poplar | Diono Radian 3RXT Safe+ | |
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Height Range | 40 - 57 inches | |
Weight Range | 40 - 120 pounds |
Dimensions and Weight
Britax Poplar | Diono Radian 3RXT Safe+ | |
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Width | 17.0 inches | 17.0 inches |
Height | 20.5 inches | 28.5 inches |
Depth | 23.5 inches | 16.0 inches |
Weight | 27.2 pounds | 30.6 pounds |
Core Specifications
Britax Poplar | Diono Radian 3RXT Safe+ | |
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Model Year | 2023 | 2018 |
Made In | USA | China |
Frame Material | Reinforced Steel | Reinforced Steel |
Safety and Compliance
Britax Poplar | Diono Radian 3RXT Safe+ | |||||||||||||||||||||||||||||||
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Federal Safety Standards | Does not meet standards | Meets all standards | ||||||||||||||||||||||||||||||
Configurations FAA-Approved for Airplanes |
Forward-Facing Rear-Facing |
Forward-Facing Rear-Facing High Back Booster Backless Booster |
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NHTSA Ease-of-Use Ratings | Not rated by NHTSA. |
Rear-Facing Mode
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Previous Recalls | This car seat has never been recalled. | This car seat has never been recalled. |
Features
Britax Poplar | Diono Radian 3RXT Safe+ | |
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Attachment Methods |
LATCH Seatbelt |
LATCH Seatbelt |
Harness Type | 5-Point | 5-Point |
Cup Holders | Has cup holders. | Has cup holders. |
Warranty and Durability
Britax Poplar | Diono Radian 3RXT Safe+ | |
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Manufacturers Warranty Length | 1 year | 1 year |
Lifespan | 10 Years | 10 Years |
Additional Links
See all Britax car seats | See all Diono car seats |
Full review of the Britax Poplar Full review of the Diono Radian 3RXT Safe+ |