It does what it claims

Update: this app is one of a suite of apps, all 3 of which I paid for. Rather then rewarding me for continually buying their new apps, Argus has now decided to go to a monthly fee for their "premium" version of the app. When I purchased this app, I thought I was done paying. Now the vendor wants me to pay every month, forever. No thank you.

Update, just had physical, app measures very close to nurse and docs measurements.

Update. Works great on iPhone 5 too.

This app does what it claims to do. I use an iPhone 4S, so it has a built-in light for the camera. I suspect earlier versions of the iPhone may work best in bright light. If you have a flash on your phone you should be fine, and my experience has been very accurate readings. Kudos to the developers. For $.99, this is an easy purchase.

Dallas iPhone about Instant Heart Rate+ HR Monitor