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Best All in One Car Seats 2023

November 24, 2022 By Kristian

If you are looking for a car seat for your baby or older child, you will need first decide which type of seat is likely to be most suitable for you and your budget. One of the options available is an all-in-one car seat. Within this post, I aim to help you identify the best all in one car seats available to buy in the USA and Canada in 2023.

One of the big advantages of choosing an all-in-one car seat rather than an infant car seat for a baby is that you can save a lot of money in the long run.

All of the car seats mentioned below can be used from birth right up to the point when your child has outgrown child car seats altogether, which is why they are called “all in one” seats.

This longevity of use is what makes all-in-one child car seats such a good option for those on a tight budget. They could well be the only car seat that you ever need to buy for your child.

If, instead, you choose to start out with an infant seat, to be replaced after a year or so by a convertible car seat, and finally a booster seat, you’re going to end up paying a lot more overall than if you buy an all-in-one car seat from the start.

Ideally, if you want to maximize costs savings, you should buy an all-in-one car seat for your baby to use from birth. However, if you have started with an infant seat, an all-in-one seat can also make a sensible upgrade rather than a convertible car seat. If you choose a convertible seat instead, you will have to upgrade to a booster seat in the future, and this will involve extra expense.

I only ever recommend high quality premium child car seats and all of the products reviewed below come within that description. If you are buying an all-in-one car seat, you definitely need to ensure that you choose a premium product as it will need to remain in good condition for many years.

So, in no particular order, here are my Top 4 All in One Car Seats available in 2023.

#1 Diono Radian 3Q Range

There are 3 seats to choose from in the Diono Radian 3Q Series of all in one car seats.

From the bottom to the top of the range, they are:

  • Diono Radian 3QX
  • Diono Radian 3QXT
  • Diono Radian 3QXT Plus

Although there are some significant differences between these seats, all of the Diono Radian seats are just 17 inches wide!

I have already written several detailed comparison reviews of the latest Diono Radian car seats.

You can read those reviews by clicking the following links:

Diono Radian 3QX vs 3QXT

Diono Radian 3QX vs 3QXT Plus

Diono Radian 3QXT vs 3QXT Plus

Here are some video reviews of the latest Diono Radian All in One Car Seats.

You will note that these videos describe the Diono Radian seats as convertible car seats. Whilst it is true that they can function in the same way as convertible car seats (4 – 65 pounds weight limits), they can also be used as harnessed booster seats, and then belt-positioning booster seats. As a result, they are properly categorized as All in One car seats.

The Diono Radian seats could be the only seat that you need to buy for your child as they are useable from birth right up to 120 pounds in weight or 57 inches in height.




Diono Radian All in One Seats – Key Features:

  • Weight Range – 4 to 120 pounds
  • Rear-facing up to 50 pounds
  • Maximum Height – 57 inches
  • SuperLATCH
  • Steel Frame & Anti-rebound bar
  • Side Impact Protection
  • 12-Position headrest
  • Recline options
  • 17 inches wide

If you have already read enough about the Diono Radian seats and are almost ready to make a purchase, you can check the best prices and/or read more user reviews by following the links below.

Check Best Prices of Diono Radian 3QXT Seats

Read User Reviews

Find the Best Canadian Prices and User Reviews

#2 Britax One4Life ClickTight

Unlike the Diono Radian “range” of seats, there is only a single Britax all-in-one car seat available to buy in the USA and Canada. That seat is called the Britax One4Life ClickTight.

The reason that the Britax One4Life ClickTight seat carries the “ClickTight” label is due to one of the unique ways in which the seat can be installed in your vehicle.

As the product names suggests, the One4Life ClickTight seat comes fitted with the Britax ClickTight Installation System.

Although the seat can be installed in a traditional manner using the lower LATCH connectors, it also comes with the added option of being installed using the Britax ClickTight Installation System.

So, what is the Britax ClickTight installation system?

The ClickTight installation system involves a simple 3-stage process. You open the compartment, you feed the seat belt through the appropriate route, and then you close the compartment until you hear the “click”.

Watch this video to see how easy it is to install a car seat using ClickTight.

CHECK OUT THE BRITAX ONE4LIFE CLICKTIGHT COLOR OPTIONS HERE


Here is a video review of the Britax One4Life ClickTight:


Britax One4Life ClickTight – Main Features:

  • Weight Range – 5 to 120 pounds
  • Rear-facing up to 50 pounds
  • Height limit of 63 inches
  • 2 layers of side impact protection
  • Patented V-Shape Tether
  • High Strength Steel Frame
  • Safecell Cumple Zone
  • 15-position headrest & Harness adjustment
  • 9 recline options
  • 2 x drinks/snacks holders – removeable and washable
  • Certified for Aircraft Travel
  • 10-year seat expiration

The Britax One4Life ClickTight is an all-in-one car seat comes with a great many safety and convenience features, as you would expect from a top-of-the-range premium car seat.

It is a particularly good option for any child that is likely to grow to be taller than average due to its very generous maximum height limit of 63 inches, which compares very favorably with the 57-inch height limit on the Diono Radian seats.

Check Best Price of Britax One4Life ClickTight

Read User Reviews of Britax One4Life ClickTight

Check Best Price of Britax One4Life ClickTight in Canada

#3 Chicco Fit4 Adapt

The Chicco Fit4 Adapt is their top-of-the range all-in-one car seat and comes with the most safety and comfort features.

It is quite a compact seat compared with some of the other all-in-one car seats mentioned within this post and this makes it an excellent option for those with smaller vehicles.

It’s not actually as narrow as the Diono Radian range of seats, but its other dimensions are smaller. So, if you are more worried about being able to fit 3 seats side-by-side, the Diono Radian Seats are a better option. But, if you have a smaller car and don’t have to fit 3 in a row, the Chicco Fit 4 Adapt is definitely one to put at the top of your shortlist.

The smaller size of the Chicco Fit4 Adapt seat does come with one downside though. The maximum height limit on this seat is 57 inches (like the Diono Radian), but its maximum weight limit is just 100 pounds, which is 20 pounds lower than the Diono Radian and Britax One4Life ClickTight seats.

The Chicco Fit4 Adapt seat also has a lower maximum rear-facing weight limit of 40 pounds rather than 50 pounds.

Aside from this lower maximum weight limit, the Chicco Fit4 Adapt seat comes with all of the premium features that you would expect from one of their all-in-one car seats.

Here is a video review of the Chicco Fit Adapt seat.

Note: Although the video describes the Chicco Fit4 Adapt as a convertible car seat, it definitely qualifies as an all-in-one seat since it has a booster seat mode up to 100 pounds and/or 57 inches.

Chicco Fit4 Adapt – Main Features:

  • Weight Range – 4 to 100 pounds
  • Rear-facing up to 40 pounds
  • Height limit of 57 inches
  • 2 layers of side impact protection
  • SuperCinch LATCH
  • High Strength Steel Frame
  • 4-Stage FitKit System
  • 10-position headrest & Harness adjustment
  • 9 recline options with ReclineSure
  • 2 x drinks/snacks holders – removeable and washable
  • Certified for Aircraft Travel
  • 10-year seat expiration

Check Best Price of Chicco Fit4 Adapt

Read User Reviews of Chicco Fit4 Adapt

Find Chicco Fit4 Adapt in Canada

#4 Cybex Eternis S

The Cybex Eternis S is the only all-in-one seat currently available from this well-known and respected company.

It comes with the usual range of safety and convenience features and has comparable height and weight limits to the Diono Radian seats.

There are 2 notable safety features that are unique to the Cybex Eternis S all-in-one car seat.

Firstly, it boasts an adjustable linear side impact protection system that is said to absorb 25% more crash forces in certain types of side impact collision. There is also a headrest that comes with adjustable recline options in addition to the usual height adjustment options. This feature is designed to keep your child’s head in a safer position and prevent it from flopping forwards when they fall asleep.

Secondly, the patented SensorSafe technology connects your seat to a mobile application, which can alert you to potentially dangerous situations, such as your child being in the seat for too long, when it is too hot, or if they unbuckle themselves.

This video from Cybex provides more information on these unique features.

Here is a video review of the Cybex Eternis S car seat.

Again, this is definitely an all-in-one car seat and not just a convertible seat!

Cybex Eternis S Seat – Main Features:

  • Weight Range – 4 to 120 pounds
  • Rear-facing up to 50 pounds
  • Height limit of 57 inches
  • Adjustable Linear side impact protection
  • High Strength Steel Frame
  • Unique 3-recline position headrest
  • 12-position adjustable headrest
  • 6 Seat Recline options
  • SensorSafe 4-in-1 SafeKit
  • 2 x drinks/snacks holders – removeable and washable
  • Certified for Aircraft Travel
  • 10-year seat expiration

Check Best Price of Cybex Eternis S

Read User Reviews of Cybex Eternis S

Find Cybex Eternis S in Canada

Safety Information


After purchasing any child car seat, you should always read the User Manual thoroughly before using it. It is also advisable to visit your local Fire Department or NHTSA Child Car Seat Inspection Centre to ensure that the seat is definitely suitable for your child’s specific requirements and that you have installed it correctly. These services are usually provided free of charge.

You can find your nearest NHTSA Centre here.

Get in Touch


If you have any comments to share or questions to ask about my Best All in One Car Seats 2023 review, please leave them below and I will get back to you as soon as possible.

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