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First aid · DK

Hjerteredder

Keeps the rhythm during CPR, so you can concentrate on the person in front of you.

Android Get it on Google Play iPhone Download on the App Store

What it does

Hjerteredder counts 30 compressions at a steady beat, calls out the rescue breaths, and starts over. A click, a buzz and a Danish voice keep the rhythm, and the emergency number is always one tap away. Works offline and collects nothing.

  • 30/2 rhythm, per Danish first-aid guidelines
  • 100, 110 or 120 BPM
  • A click and a buzz on every compression
  • Danish voice — male or female
  • Emergency button always on screen
  • Works without a connection

Hjerteredder is not a substitute for CPR training. In a cardiac arrest, always call the emergency services first. The app keeps the beat — it does not assess the person's condition.

How it works

The rhythm, when you cannot count yourself

In a cardiac arrest every second counts, and CPR has to be given at a fixed rhythm: 30 compressions, 2 breaths, repeat. It is not hard to learn — but it is very hard to hold when it happens for real. Hjerteredder counts for you.

01

Four steps, before anything else

The app does not open on a metronome. It opens on the four steps of first aid, in the order they must happen: make the scene safe, assess the person, call for help — dial 1-1-2 — and only then give first aid.

Step three is marked in red, because that is the one people skip or postpone. The screen carries a 112 button in the corner the whole way through, including while the rhythm is running, so calling never means leaving the app.

If you know the routine, the screen can be switched off with a tick — but it is there by default, every time.

The four steps of first aid. 112 is marked red, because that is the step that gets skipped.
The four steps of first aid. 112 is marked red, because that is the step that gets skipped.
02

30 compressions, 2 breaths, repeat

Press START and the app begins to keep time: a click through the speaker and a knock in the phone for every compression, and a spoken count so you can hear how far you are. The number in the middle counts to 30 while the ring around it closes.

At 30 the screen changes colour — from red to blue — and says INDBLÆS, 1 of 2. Then a new series begins and the cycle counter ticks up. The timer at the top runs throughout, so you know how long you have been going when the ambulance arrives and asks.

You do not have to watch the screen. The whole rhythm is sound and vibration, because your hands are busy and your eyes are on the person on the ground.

  • A click and a vibration for every compression
  • A spoken count, so you can follow without looking
  • The screen changes colour at the switch between compressions and breaths
  • Timer and cycle counter run throughout
27 of 30 compressions, second cycle. The ring shows how far the series has come.
27 of 30 compressions, second cycle. The ring shows how far the series has come.
At 30 the screen turns blue and says INDBLÆS — breath 1 of 2.
At 30 the screen turns blue and says INDBLÆS — breath 1 of 2.
03

The tempo is yours — within the recommended range

The official guidance says 100 to 120 compressions per minute. The app offers exactly those three: 100, 110 and 120, and nothing else. You cannot wind it down to 60 or up to 160, because then it no longer keeps its promise.

The voice that says 'breathe' comes as male or female — press the button and you hear it at once, so the choice is made on the sound rather than the label. Vibration can be switched off if you would rather have sound alone.

The app is free and carries no advertising. There is no account, no tracking and nothing to download along the way: it works with no network connection, which is the whole point of an app you need to trust in a basement or a gravel pit.

100, 110 or 120 compressions per minute — the three that sit within the guidance.
100, 110 or 120 compressions per minute — the three that sit within the guidance.
Ready to start. The 112 button stays in the corner.
Ready to start. The 112 button stays in the corner.

About the basis

The app is a timing instrument, not a reference work. It follows the commonly accepted guidance for adult cardiopulmonary resuscitation.

30:2
Thirty compressions followed by two breaths — the standard ratio for adults
100–120 compressions per minute
The recommended range; the app offers only tempos inside it
1-1-2
The call button stays on screen, including while the rhythm runs
Works offline
No account, no network connection, no advertising