Do I have to sign in to use the Lifetime app? No, you don't have to sign in to use the Lifetime app. There will always be lots to watch for viewers who don't sign in. Related articles What's the difference between watching while signed in and watching while not signed in? Can I use the Lifetime app if my TV provider doesn't support it? Where can I get the Lifetime app? Where do I get my TV provider information? What is the Lifetime app?