You can do heart coherence with your kitchen timer. Or with a dedicated app. Here's the real difference between the two, and when one wins over the other.

The minimum to practice

Heart coherence is a breathing rhythm (5 seconds in / 5 seconds out) held for 5 minutes. That's it.

You can do this with:

  • A plain timer set to 5 minutes.
  • A metronome or counter.
  • A watch with a counter.
  • A dedicated app.

All of these work. But they don't have the same friction.

What the timer does

You start a 5-minute timer, you count mentally (1, 2, 3, 4, 5) on the inhale, the same on the exhale. You loop until the timer rings.

Pros:

  • Free, already on your phone.
  • No app to install.
  • No dependency.
  • Quick to launch.

Cons:

  • You have to count mentally, which takes attention.
  • No visual to guide you, so harder to hold.
  • No progress indicator.
  • Tendency to drift off the rhythm without noticing.
  • The timer sound at the end wakes you up instead of calming you, especially at bedtime.

What a dedicated app does

You pick your rhythm and duration, you launch. A visual rises (inhale) and falls (exhale). At the end, the screen tells you.

Pros:

  • No need to count (the visual guides).
  • Stable rhythm held effortlessly.
  • Clear, visual ending (not a buzzer).
  • Often: different modes (5-5, 4-6, 4-7-8).
  • Often: dark mode for bedtime.

Cons:

  • An app to install.
  • Often freemium or with ads.
  • More friction than opening a clock.

The real differentiator: cognitive load

With a timer, your brain does two things: count and breathe. With a visual app, you do only one thing: follow the visual and breathe along with it.

For an activity meant to switch off the mind, this difference is huge. That's why apps with a visual have a stronger effect than the timer practice, at equal duration.

When the timer is enough

The timer is fine when:

  • You've been practicing for a long time and know the rhythm by heart.
  • You're doing 1-2 minutes only, not 5.
  • You're practicing while walking or in a context where you can't look at a screen.
  • You don't have a smartphone nearby.

When the dedicated app makes a real difference

The app pulls ahead when:

  • You're starting and can't hold the rhythm.
  • You practice at bedtime (a soft visual is better than a buzzer).
  • You want to vary rhythms (5-5 during the day, 4-6 in the evening).
  • You want the mind completely unloaded during the session.

Free apps that do the job

  • Respirelax+ — Ball going up and down, free, choice of rhythm.
  • Apple Health — Pulsing circle, built into iOS.
  • Dioboo — Animated journeys, no voice, designed for bedtime (iOS).
  • iBreathe — Several techniques, free.

All of these apps do better than a timer for heart coherence. Pick the one that suits you aesthetically.

What I do personally

I used a timer for the first two weeks. Then I built Dioboo because I wanted something more immersive and the existing apps didn't suit me for bedtime.

The app has an advantage the timer can't: you no longer have to count. For an evening practice where the goal is to switch off the mind, that's a key factor.

But the timer is still usable. If you're starting out and want to test before installing an app, do it. It works too.

The compromise: one app, for a while

If you're still hesitating, here's a fair compromise: install one free app, use it for 4 weeks, and judge.

If you feel the practice has become automatic and the app doesn't add anything anymore, go back to the timer. You'll have internalized the rhythm.

If the app keeps adding value (stable rhythm, clear ending, visual atmosphere), keep it.

In summary

  • Timer: works, free, but harder to hold the rhythm and quiet the mind.
  • App: install friction, but more effective practice at equal duration.

For evening practice specifically, the app makes a real difference. For 5-minute daytime practice, both work.