Good heartbeat apps?

Question

I have an iPhone and don't really wanna pay 4.99 for an app I'll only use a couple times! Is there any free apps to pick up the baby's heartbeat that actually work?

Answer

I bought a feral Doppler, it was only $50 and I got it 2 days after ordering!!! It works great. Picked up the baby's heartbeat at about 10 weeks at home.