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Card 281 of 9992026-08-30 issue

Observed arrival · 2026-08-30

4–6, the resonance-breathing coach

foursix.app Observed source
Editorial interest 84/100 Selection signal · not a rating of the site

An iPhone breathing app that finds a user’s strongest heart-rate response, guides practice with sound, and explains what to change after each session.

Landing page captured for the 2026-08-30 issue.

Field notes

The product combines paced breathing with session interpretation: it searches for the breathing rate that produces the strongest heart-rate response, then compares later readings with personal reference ranges. The example uses the last 30 sessions, reports a sample size of 24, and flags a 0.10 Hz peak as exactly matching the paced rate. Its audio cues separate inhale and exhale, allowing practice without watching a screen.

Observed signals

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Editorial observations of this landing page, not a rating.

OpenPublic substance visible
PrettyNotable craft visible
ProPolished or operationally mature
NicheUnusually specific use

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Landing page observed 2026-08-30. The live site may have changed.