Second TV in Switzerland: how Swisscom, Sunrise, Salt and Zattoo handle more than one TV

As read from the providers' own pages; the current prices are on each page:

What limits you is how many TVs show a programme at the same moment, not how many TVs you own. Two TVs that are never on at the same time need one stream; a family with a TV in the living room, one in the bedroom and a laptop in the evening needs three. Zattoo makes this explicit with its per-plan stream limits, and Sunrise states five. For Swisscom, the TV-Box limit and the Multiroom Max add-on do the same job.

A second room does not always need a second box. Swisscom says its blue TV app runs on most smart TVs and on Apple TV 4K, with limits such as no radio, teletext, HbbTV or subtitles through the app on those devices, and its Apple TV page says the app runs on Apple TV from the 2015 models and that you order an additional stream for it. Sunrise's Up TV M gives the app only. A box is the better choice where you want the full operator experience; an app is enough where you want live TV and replay.

Every extra TV is another stream on your home network. Sunrise says its TV Box can use Wi-Fi but recommends a cable because it is more stable, and Zattoo calls a LAN cable the most stable option for a TV. Swisscom's Apple TV 4K can connect over Wi-Fi, by Ethernet cable or with a powerline connection kit. If the second TV is far from the router, a cable or powerline link usually beats a faster plan; see fixing TV buffering.

A practical order:

See also Do you need a TV box?, Replay and recording compared and Swisscom blue TV explained. For the whole picture, start from IPTV Switzerland: licensed providers compared.