Apple has updated its media-streaming box at the company's 12 September event, and it comes as no surprise to learn it now supports 4K and HDR streaming (downloads are still HD).

More surprising is the fact Apple has no intention of charging you extra for the privilege of watching high-res content. Indeed, the company has confirmed it will upgrade all existing iTunes purchases to 4K where it's available - for free.

When is the new Apple TV 4K release date?

You can now buy Apple TV 4K, which came out on 22 September.

Apple TV 4K

How much does the new Apple TV 4K cost?

The new box is available in 32- and 64GB capacities, priced at £179 ($179) and £199 ($199) respectively at Apple's online store

The fourth-gen Apple TV remains on sale at £149 ($149).

Compare this to the Roku 3, which does not support 4K but is available a lot cheaper.

Apple TV 4K

What is the difference between Apple TV (fourth-gen) and Apple TV 4K?

At first glance, there is very little separating the design of the fourth-gen Apple TV and new Apple TV 4K. There's a new white ring around the menu button on the remote. Yep, that's it.

It's the functionality that has changed, and this is key when it comes to a box intended for media streaming. Apple has caught up with its rivals by adding support for 4K and HDR with HDR10 and Dolby Vision. That means you'll get sharper images (more pixels) with enhanced colour (better pixels).

Of course you'll still need a 4K TV to enjoy the new 4K content. But if you do have such a set, you'll also be pleased to know all your existing HD purchases will be upgraded to 4K for free.

The Verge has pointed out, however, that Apple TV 4K supports three major hardware-accelerated video codecs: H.264, HEVC (H.265) and MP4. That means it does not support the VP9 format favoured by 4K YouTube streams, and any content from that platform will be upscaled from 1080p on the box.

In terms of hardware the Apple TV 4K now features the Apple A10X Fusion chip, which is the same processor as seen in the iPad Pro. It means the new Apple TV is two times faster and offers four times better graphics than the fourth-gen device.

By the end of the year we'll finally see the new TV app come to the UK, and we will benefit from 4K content from both Netflix and Amazon Prime Video (when it becomes available). The Apple TV 4K will also integrate with iPhones and iPads, allowing you to stream your photos and video to the box.

For more on tvOS see our sister site Macworld.