Viofo A329S 3CH review: A flagship three-channel dash cam for full coverage

You might already be familiar with the Viofo A329 – it’s a flagship dash cam that we awarded the full five stars to in 2025 – and now there’s a new version, called the A329S.

The biggest difference is this being a three-channel system, with forward, rearward and interior cameras all bundled into one kit. The standard A329 was a two-channel system that lacked an interior camera.

That interior camera looks good, too. It records infrared 2K video at 30 frames per second through an ultra-wide 210-degree fisheye lens. Not everyone needs a dash cam with an interior view, but for professionals like taxi drivers this extra view can be enormously helpful.

The rest of the system comes out swinging too. There are dual Sony Starvis 2 imaging sensors that promise strong low-light performance, Wifi 6, and support for recording directly to portable SSDs up to 4TB in capacity. The forward facing camera records 4K at 30 fps, or 60 fps when the interior camera isn’t in use.

At $470 the Viofo A329S is a seriously expensive dash cam, but all that money it promises to deliver a high-end three-channel system that leaves little on the table. Is it worth it? Read on to find out.

Viofo A329S: Specifications

Viofo A329S: Price

At £430 in the UK and $472 in the US, this is certainly an expensive dash cam kit. You get a lot for your money, but you should ask yourself if you really need everything the A329S has to offer before placing an order.

It’s more expensive than rivals like the Garmin X310 and Nextbase 622GW, but boasts features they miss, like an especially wide interior camera that could be invaluable to those who need it, such as taxi drivers.

Viofo A329S: Design & Handling

Much like other Viofo’s dash cams, the A329S has a small display and five buttons on the rear, a microSD card slot and connections for the rear and interior cameras on the right, and a USB-C port on the left.

A polarising lens filter for the front-facing camera is included in the box, along with a 12-volt lighter socket power adapter, a cable installation tool, and a set of three windscreen static stickers for sticking the cameras in place in a way that makes them both secure but also easily removable.

Every component feels like a high-quality item, with a premium aesthetic (as far as dash cams go, anyway).

But there are some important design constraints to be aware of before you install the A329S, especially if you live in a right-hand-drive country like the UK. Since the dash cam is removed by sliding it to the left from its mounting plate, make sure you don’t fix it just to the right of your central mirror housing (as I did), as there won’t be enough room to remove it.

Also make sure to mount the interior and rear cameras the right way up, which is easier said than done given their cylindrical design. If you don’t, like me, the video stream will be upside-down – something that’s quickly fixed in the Viofo smartphone app.

Viofo uses coaxial cables for connecting secondary cameras to the main unit, instead of the USB-style cables often used by rivals. This is welcome, since Viofo’s cables are thinner and therefore easier to tuck behind interior trim.

Each component of this three camera kit is relatively small, but in a compact car the main unit and interior camera still take up quite a lot of windshield space.

Viofo A329: Performance

Above: sample video shot with the Viofo A329S 3CH dashcam

A look at the specification sheet might already be enough to portray the A329S’ capabilities. It’s a flagship dash cam that can record in 4K, has three cameras, and captures excellent video from all of them.

This is fundamentally true of the standard A329 too, which I reviewed in 2025. The primary difference here is how the S model comes with an interior camera. This records at 2K resolution, with infrared night vision that automatically switches on in low light, and through a 210-degree lens. This is extremely wide for a dash cam – wider than I’ve ever seen on a dash cam, in fact – and captures a field-of-view that’s far larger than the rear camera (160 degrees) and front camera (140 degrees).

The result is a camera that doesn’t just capture the interior of your car (and your occupants, if you’re a taxi driver), but also a view through the side mirrors too. This gives the A329S the potential to capture evidence of a side impact, or an altercation that occurs alongside your car, or through the window.

Video quality is excellent from all three cameras, with the front-facing unit producing especially good footage with its 4K sensor. There’s very little grainy noise, as you often get from dash cams, and even at night recordings remain decent. You often can’t read a number plate in full darkness, but other details like street signs remained legible with very little illumination.

The rear-facing camera is less impressive, with passable daytime footage but fairly grainy results when recording at night. That said, it’s about on par with other high-end dash cams, and at 160 degrees has a wide field of view.

Naturally, an interior camera won’t be for everyone. Private motorists are unlikely to need footage of themselves driving and passengers, even family members, might well object to being recorded on every journey. But for taxi and ride-share drivers an interior view can be useful. And, where some cabin cameras are of fairly low quality, with middling resolution and a regular lens, the Viofo A329S performs brilliantly.

Viofo A329: Verdict

There’s very little to fault with this three-channel dash cam system. The front-facing camera’s 4K footage is excellent both during the day and in the dead of night, while the rear camera is passable and the interior view is extremely wide. This will only likely appeal to a few people – taxi drivers, mostly – but for them the very wide cabin view, with infrared night vision, will likely put the Viofo A329S above most, if not all, rivals.

The system is fairly easy to install, set up and use. But the nature of a three-channel dash cam means there are lots of cables to deal with, and this can be especially noticeable in smaller vehicles. You’ll need to spend time planning where to route them to keep the installation as tidy as possible.

Alternatives

Viofo A329
Essentially the same dash cam, but a two-channel system that foregoes the cabin camera on the A329S

Vantrue N4 Pro
Another high-end, three-camera system, this dash cam combines a 4K front-facing camera with rear and cabin camera that shoot at 1080p.