Instant Heart Rate - quick way to measure your heart rate with iPhone

Instant Heart Rate is the most accurate heart rate monitor app for iPhone and it does not need any external hardware. Independently tested by nurses, MDs, EMTs and fitness coaches.
Easy to use: takes less than 10 seconds from opening the app to getting a reading.

Place your finger gently over the camera. Hold it steady for at least 10 seconds. Your current heart rate will be shown on the display.

It works by tracking color changes in the light that passes through your finger.

This app constantly evolves and in process improves on ease of use and adds new features.

With over 4M downloads and more then 40k five star reviews. 

Features:

♥ Heart rate measurement;

♥ Heart rate recovery measurement;

♥ History of measured results; (Google health sync will be available soon)

♥ Target heart rate zone calculation and display;

♥ Real-time PPG (EKG-like graph);

♥ Charts (turn your iPhone on its side);

♥ Sharing to Twitter, Facebook and other social networks.

Users review:

Perfect - ★★★★★

by JohnBOhio - Version 1.0.1 - 13 October 2010

Works great, does just what it say it will do. Very accurate.

Works great - ★★★★★

by ADD boy - Version 1.0.1 - 12 October 2010

Just make sure you are not using a case that keeps your finger off the camera lens. It didn't work for me until I took my "incase" case off. Now it is surprisingly accurate.

Compared directly with Polar - ★★★★★

by Xterra411 - Version 1.0.1 - 11 October 2010

Remarkably accurate. Just make sure you relax and follow instructions. Give it a little time to stabilize. Well done!

Very cool - ★★★★

by Todd Casil - Version 1.0.1 - 11 October 2010

A very cool app. Seems to be pretty darn accurate.

a genius concept! - ★★★★★

by jdandik - Version 1.0.1 - 11 October 2010

great both for novelty to show off your phone and for practical use. I've been getting accurate and consistent reads... definitely recommend!!!!

Unbelievable! - ★★★★★

by VisualSmith - Version 1.0.1 - 11 October 2010

Saw this on a blog and figured I'd try it out. It works! It takes a second to figure out the placement but after you relax and stay still, you get a good readout. Nice innovation!

Impressive!! - ★★★★★

by Muscledennis - Version 1.0.1 - 08 October 2010

A very impressive app. This is by far the best heart rate app I've seen. It's very user friendly with nice graphics.

Download link;
File size: 4.38MB

Download here

iTunes link;
iTunes link