Simple. Sleek design.
I use this with my iPhone when I see massage therapy clients. I put my phone into my portable speaker, turn on music, then turn on this app for a clock. The clock has a sleek design that isnt "clocky" or obtrusive, so if a client looks at it they dont feel panicked at the time, they just zone back out. Its bi enough so I can see it all over the room. Running music + this clock means your battery does go faster because of screen brightness, but that is to be expected. I cant rate the alarm feature as I prefer the iPhone alarm and only utilize the clock feature. I did turn off the red alarm nag button but the nag wont go away. Thats my only beef!
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Big Clock - Alarm and Weather