Your phone is already
a stethoscope. We just helped it listen.
No doppler. No probe. No batteries. Cudly is a passive recording — your phone, against your bump, in a quiet room. Here's exactly what's happening.
- 01
Download the app and tell Cudly your due date
Cudly is free on iOS and Android. We don't ask for an email until you're ready to back up your journal. No accounts, no ads, no "would you like to share data?" pop-ups.
- 02
Find a quiet room — the quieter the better
Phone microphones are sensitive but they pick up everything. The fridge, the dog, your own breathing. Lie down somewhere quiet. Lower the lights. Take a breath.
- 03
Place your phone on your lower bump
Lie flat. Place the phone screen-down on your lower abdomen, just above the pubic bone, microphone end pointing down. Hold still for 60 seconds. Try slightly different positions if you hear nothing.
- 04
Cudly amplifies and isolates the heartbeat sounds
We process the recording in real time on your device (nothing is sent to a server) to amplify the low-frequency thumps and filter out high-frequency room noise. You'll hear a soft, fast galloping pattern when you've got it.
- 05
Save the recording with a date, a week, and a note
Every recording becomes a journal entry. Add a sentence about how the day felt. Add a photo. Add a voice memo for the baby. Build the keepsake while you're living it.
The honest stuff.
When can you realistically hear something?
Most users start catching audible sounds between weeks 16 and 22. Before 16 weeks, the baby is simply too small and too deep in your pelvis for a phone microphone to reach. Be patient.
Why is it harder some days than others?
Baby position, your position, room noise, and especially anterior placenta all affect what gets through. A successful capture on Monday doesn't mean Tuesday will work. That's normal.
What if I never hear anything?
Many users with anterior placenta never get a great recording. That doesn't mean anything is wrong — your OB's office doppler uses ultrasound and is far more powerful than a phone mic. Cudly is a keepsake, not a diagnostic. Use the journal even if the heartbeat capture never works.
Is Cudly making medical claims?
Explicitly no. We are not a medical device. We are not FDA-cleared. We are not a substitute for prenatal care. If you have any concern about your baby, call your OB. Cudly's purpose is bonding and remembering — not diagnosis.
What to expect, honestly.
Cudly works differently at each stage. Here's a quick map.
Heartbeat is essentially undetectable on phones. Use Cudly for journaling and weekly milestones — wait on heartbeat recording.
First captures usually start. Some days yes, some days no. Don't panic if nothing works — try again tomorrow.
Heartbeat recordings become reliable for most users. Partners can often hear it too. Build a sound library — record one a week.
Ready to start?
Free on iOS and Android. No accounts. No ads. No data sales. Just you, your bump, and a quiet room.