A heart rate monitor would have to be some kind of bracelet, unless you want to be wearing a chest strap all day, no?

An unobtrusive bracelet, paired with a a great app, that I could wear on my right wrist (watch on the left) would be ideal. I wouldn't mind an un-obnoxious vibrate option that lets me know I have a notification or that I need to wake up. At $49 that would be a day 1 buy for me.

Xiaomi Mi Band, It's 25 dollars and does exactly what you want it to do with a 30 days battery life.

The downside? Instead of only the American government tracking you, the Chinese government now also knows if you're out of shape!

Thanks! Almost exactly what I described. Appreciate the direction.

I continue to want a fitness monitor that's just a nice-looking watch strap, that I can put on my watch that I already like. I suppose that would be a pretty niche market, though.

there isn't any way for a clip to measure your heart rate. previously you needed a strap around your chest with wet contacts. now you need a light sensor pressed against your wrist. but no one has done it with a clip on your clothes device

I had a nephew who got excited when he saw HR done on watches. We did some research into accuracy and were surprised to find that the light-based tech used in many devices does not give you accuracy when you are running or generally moving fast. No idea about the fitbit devices but I am vary.

I assumed (incorrectly) that you just needed skin contact measure an electrical pulse (like an EKG machine).

However, that appears not to be the case. Even the wrist based optical ones are often times inaccurate.