Hi there! We're here to help you decide between the CYBEX Sirona S and the Nuna aace.
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
CYBEX Sirona S | Nuna aace | |
Type |
Convertible Rear-Facing Forward-Facing |
High Back Booster |
Current price |
Currently unavailable
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Currently unavailable
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Rating | 4.03 | 4.57 |
Our Thoughts
When it comes to selecting the most suitable car seat for your child, safety, comfort, convenience, and cost-effectiveness are key considerations. With that in mind, let's compare the CYBEX Sirona S, which is a convertible car seat, to the Nuna AACE, a high-back, and backless booster car seat.
The CYBEX Sirona S is known for its innovative 360° swivel feature, a convenience that makes placing and removing your child from the car effortless - a huge advantage particularly in tightly parked spaces. But its most significant value lies in its advanced safety technologies. It's equipped with SensorSafe technology that provides real-time updates about your child's well-being—like if the safety harness becomes unbuckled unexpectedly—right to your smartphone. It also impresses with its high weight capacity, which, for reference, accommodates up to 65 pounds in forward-facing mode. However, it loses points for its complex installation process and its larger size, which may not be best suited for compact cars.
On the other hand, the Nuna AACE is acclaimed for its longevity. Designed to grow with your child, it transitions comfortably from a high-back to a no-back booster, perfect for children aged four and above who have outgrown the initial standard car seat phase. It flaunts sophisticated safety features such as advanced side-impact protection and a belt positioner for enhanced security. Plus, it's praised for its easy installation and machine-washable fabric for conveniently keeping it clean. But do bear in mind that it's not suitable for children under two or those under 40 pounds, as this seat doesn’t offer a rear-facing configuration, which is the safest position for these younger passengers.
In terms of recommending between the two, the choice is conditional. If you're starting from infancy and need a car seat that offers versatile weight accommodation, the CYBEX Sirona S is a stellar option. It offers remarkable safety alerts with its SensorSafe technology and a unique swivel feature for your convenience. However, if your little one has already transitioned from an infant car seat, the Nuna AACE could be a more fitting choice. It's a top-tier booster that can serve your child for several years, and it emphasizes ease of installation and cleaning.
Remember, the best car seat depends on your child's current weight and age, your budget, and the features you deem most important. Both car seats promise safety, but each offers unique strengths that may better suit your particular needs.
Key Details
Sirona S | aace | |
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Brand | CYBEX | Nuna |
Type |
Convertible Rear-Facing Forward-Facing |
High Back Booster |
Weighted Rating | 4.03 | 4.57 |
1 yr Price Range | $439.96 - $549.95 | $250 - $250 |
Current price |
Currently unavailable
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Currently unavailable
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Value |
![]() Offers advanced features and long-term use from infancy to toddler years, making it a cost-effective option despite its higher price point. |
![]() The AACE, while on the pricier side, offers exceptional durability and quality, justifying its cost with long-term usability and high resale value. |
Safety |
![]() Integrated with SensorSafe technology and enhanced side-impact protection, providing top-tier safety for children. |
![]() This seat boasts advanced safety features like energy-absorbing foam, side-impact protection pods, and a belt positioner, ensuring enhanced security. |
Features |
![]() The 360° swivel design, magnetic buckle holders, and adjustable recline options set it apart from standard car seats. |
![]() Its 3-D growth system, multiple recline options, and no added fire-retardant chemicals mark it as a feature-rich option. |
Installation |
![]() Installation can be challenging, with some parents finding it complex and time-consuming. |
![]() Users find the installation process straightforward, thanks to its adjustable latch connectors and clear instructions. |
Cleaning |
![]() The seat cover is removable and machine washable, simplifying the cleaning process. |
![]() The seat's machine-washable fabric and easy disassembly for cleaning add to its practicality. |
Size |
![]() While it’s not the most compact, its design accommodates growing children, balancing size with comfort and safety. |
![]() While not the smallest booster, its design is space-efficient, offering ample room for growth without being overly bulky. |
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 CYBEX Sirona S and the Nuna aace. 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
CYBEX Sirona S | Nuna aace | |
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Height Range | 17 - 49 inches | |
Weight Range | 4 - 50 pounds |
Forward-facing
CYBEX Sirona S | Nuna aace | |
---|---|---|
Height Range | 28 - 49 inches | |
Weight Range | 22 - 65 pounds |
Booster
CYBEX Sirona S | Nuna aace | |
---|---|---|
Height Range | 38 - 60 inches | |
Weight Range | 40 - 120 pounds |
Dimensions and Weight
CYBEX Sirona S | Nuna aace | |
---|---|---|
Width | 20.0 inches | 22.5 inches |
Height | 25.5 inches | 33.0 inches |
Depth | 25.3 inches | 15.0 inches |
Weight | 30.4 pounds | 15.6 pounds |
Core Specifications
CYBEX Sirona S | Nuna aace | |
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Model Year | 2021 | 2021 |
Made In | China | China |
Frame Material | Reinforced Steel | Plastic |
Safety and Compliance
CYBEX Sirona S | Nuna aace | |||||||||||||||||||||||||||||||
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Federal Safety Standards | Meets all standards | Meets all standards | ||||||||||||||||||||||||||||||
Configurations FAA-Approved for Airplanes |
Rear-Facing Forward-Facing |
High Back Booster Backless Booster |
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NHTSA Ease-of-Use Ratings |
Rear-Facing Mode
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Booster Mode
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Previous Recalls | This car seat has never been recalled. | This car seat has never been recalled. |
Features
CYBEX Sirona S | Nuna aace | |
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Attachment Methods |
LATCH Seatbelt |
Seatbelt |
Harness Type | 5-Point | N/A |
Cup Holders | Has cup holders. | Has cup holders. |
Warranty and Durability
CYBEX Sirona S | Nuna aace | |
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Manufacturers Warranty Length | 2 years | 2 years |
Lifespan | 10 Years | 10 Years |
Additional Links
See all CYBEX car seats | See all Nuna car seats |
Full review of the CYBEX Sirona S Full review of the Nuna aace |