Heart
25–200 Hz
The low thump of each beat, with chest and room noise above it filtered out.
Stethoscope for iPhone
Your iPhone,
listening in.
Place the microphone against your chest and hear your heart through headphones. Watch it as a live spectrogram, switch filters for breath and bowel sounds, and keep the last fifteen seconds after something catches your ear.
Free to listen · iPhone
HEART · 25–200 Hz
Listening presets
Tuned for what you're listening to.
Each preset filters what you hear, never what's recorded. Your saved audio keeps every original sample.
Breath
50–2,500 Hz
The rush of air on each breath in and out. Wide detail opens it up to 5 kHz.
Bowel
50–1,500 Hz
The irregular gurgles of digestion, easy to miss without the right filter.
Also included: Body sounds (50–1,000 Hz) and Full range. Spectrograms here use the app's own renderer with synthetic audio.
Built around listening
Catch the moment after it happens.
The last fifteen seconds BUFFER
Heard something unusual? Tap review, trim the part you want and save it. The app is always holding the most recent audio.
Record whole sessions 30 MIN
Lossless recordings up to thirty minutes, saved to a searchable Library with names and notes.
Play back with any filter PLAYER
A full-screen player with spectrogram, zoom and trim. Change the preset and hear the recording the same way you did live.
Stays on your iPhone PRIVATE
No account, no cloud, no analytics. Recordings leave your phone only when you share them.
How to listen
Three things make the difference.
Connect headphones
Live listening plays through headphones only. Start with the volume low, then turn it up gradually.
Position the phone
Remove the case and gently place the bottom microphone against bare skin. Don't press hard or cover it with clothing.
Keep still
Choose a quiet room. Hold still, and move slowly between nearby positions to reduce rubbing noise.
Pricing
Listening is free.
Recording Plus adds recording and saving from the buffer. Your existing recordings always stay playable.
Listen
Free
Live listening, every preset, the live spectrogram, and reviewing the last fifteen seconds.
Recording Plus · Monthly
$1.00 / month
Record sessions and save from the buffer. Cancel anytime in your Apple Account settings.
Recording Plus · Lifetime
$5.99 once
The same features with a single payment. Costs the same as six months.
Prices in US dollars; the App Store shows your local price. Payment is handled by Apple.
Please read
Not a medical device.
Stethoscope is for personal listening and education. It doesn't diagnose or assess health, and its experimental heart-rate estimate is not clinically validated. Don't use it for pregnancy monitoring or medical decisions. If you have a health concern, see a professional, whatever you hear.