[Kisil]

Services make sense when you add value on an ongoing basis. Since it's not only possible but pretty simple to build this as an app, it makes much more sense to sell it as an app.

More importantly, anything that depends on having active service is much less reliable, and an alarm clock should be reliable above almost all other factors.

[svmegatron]

That's a very good point. Really the only benefit I can think of to providing it over the phone is that it would work with any (well, almost any - it wouldn't work with a rotary phone) phone, not just a smartphone.

Thanks for the feedback! I will get started now :-)