[icodestuff]

The pulse is probably doable but difficult, at least on an iPhone. The noise in the accelerometer data from just holding it is pretty substantial.

[gms7777]

Pulse is pretty trivial with another sensor on pretty much every smart phone out there: the camera

I've been using pulse apps for probably at least a decade

[TedDoesntTalk]

I’ve compared iPhone pulse apps to my Polartec H10 chest strap and they are wildly different many times. More than 10% difference easily.