As noted by Variety, “Shudder, which is run by AMC Networks, launched in beta last summer. The service is available on the web as well as on mobile devices and on Roku streaming devices, and costs consumers $4.99 per month. Shudder is also available through Amazon Channels, the subscription video services platform operated by Amazon, as well as Ellation’s recently-launched video subscription bundle VRV.”
You can find out more about the devices that support Shudder here: http://support.shudder.com/customer/en/portal/topics/781890-devices/articles
Shudder is currently available in the US, Canada and the UK with plans to expand worldwide.