Feel the calm
CardiCalm turns your phone's vibration into a slow, heartbeat-like pulse that gently helps you relax. No screens. No noise. Just feel it.
Free on Android and iPhone · No account · Collects no personal data
The moment you open CardiCalm, it shows the whole idea in a breath — then tells you where to hold it: in your hand, on your chest, in your pocket, or on the mattress. Nothing to read, nothing to watch.
How it works
Many people find their body settles toward a steady rhythm they can feel — the idea behind tactile entrainment.
A heartbeat
The phone's vibration motor recreates a slow, heartbeat-like pulse. Held in your hand or on your chest, your body gradually takes on the calmer rhythm.
Calms the body and mind
A slow, steady pulse gives your breath something calm to follow. Set it slower than your resting heart rate, breathe along, and let a racing mind ease down.
CardiCalm is a wellness aid, not a medical treatment. Its approach draws on research into slow, rhythmic stimulation and slow breathing for relaxation — see, for example, Azevedo et al., 2017 (Scientific Reports) and Haynes et al., 2022 (PLOS ONE).
Simple, yet powerful
Free
- Heartbeat vibration with adjustable tempo (BPM)
- Intensity control and a timer you can set to the minute, from 1 to 60
- Real heartbeat sound, dark mode, runs in your pocket
- Vibration calibration: sound and vibration arrive together, on any phone
Pro one-time
- Biosync Android — measures your pulse with the camera and gently guides it down to calm
- Personalised tempo iPhone — reads your resting heart rate from Apple Health and suggests a starting tempo just below it (needs an Apple Watch)
- Custom wind-down — you choose where it starts, where it lands and how long it takes
- Breathing modes (4-7-8, box, coherent)
- One-tap presets & your own saved rhythms
- A single purchase — yours forever
Four ways to use it
In your hand
The fastest way to settle
On your chest
Slows your breathing
In your pocket
Discreet calm among people
On the mattress
For drifting off to sleep
Questions, answered
Does phone vibration really help you calm down?
Many people find a slow, steady pulse relaxing. Research on slow, rhythmic stimulation and slow breathing suggests it can lower felt tension and help you settle. CardiCalm is designed as a calming aid, not a medical treatment.
What is tactile entrainment?
It's the idea that your body tends to settle toward a steady external rhythm you can feel. CardiCalm gives you a slow, heartbeat-like pulse to breathe and relax along with.
Do I need an internet connection or an account?
No. CardiCalm works offline, needs no account, and collects no personal data — everything runs on your device.
How is it different from a breathing app?
Instead of watching a screen, you feel the rhythm. You can hold the phone in your hand, on your chest, in a pocket, or on the mattress — eyes closed.
Is it safe to use at night or for sleep?
It's designed to help you wind down. CardiCalm is a wellness tool, not a medical device. If you have a pacemaker, a heart-rhythm condition or epilepsy, talk to your doctor first, and don't use it while driving.
Does the vibration feel the same on every phone?
Phone vibration motors differ a lot: some have a precise linear motor, others a rotating one that takes longer to spin up. CardiCalm detects which one it is dealing with and adapts the length of each beat, so it stays a clear double thump instead of blurring into a single buzz. It also measures and corrects the delay between the sound and the vibration so they land together. If your ear says otherwise, you can fine-tune it by hand under Settings → Vibration & sound.
What do I get with Pro?
Pro is a one-time purchase that unlocks the custom wind-down (you set the starting tempo, the target and the duration), breathing modes (4-7-8, box, coherent) and saved presets — yours forever. On Android it also unlocks camera-based pulse measurement (Biosync); on iPhone it unlocks a personalised starting tempo read from your Apple Health resting heart rate (this needs an Apple Watch).
Your calm is private
CardiCalm collects no personal data. The camera pulse measurement runs entirely on your device, in real time — nothing is recorded, nothing leaves your phone.
Good to know
A few safety notes before you begin.
- CardiCalm is a wellness tool — not a medical device — and does not provide medical advice.
- If you have a pacemaker, a heart-rhythm condition or epilepsy, talk to your doctor first.
- Don't use it while driving or operating machinery.
- If you feel any discomfort or dizziness, stop right away.
- For children, use only with adult supervision.
Who makes CardiCalm
CardiCalm is made by Bitagent Kereskedelmi és Szolgáltató Kft. (Hungary), an independent, privacy-first studio. We built it because calming down shouldn't require another subscription, another screen, or another gadget — just a rhythm you can feel. Questions? support@cardicalm.com