Breathe CLI – Paced resonance breathing in the macOS terminal
I built a terminal app that paces slow breathing at 6 breaths per minute for vagal tone training. It's a single Python file, stdlib only, no dependencies — just run breathe and follow the bar.I'm a cardiology patient (HFrEF). Slow breathing at resonance frequency is one of the few non-pharmacological interventions shown to improve cardiac vagal tone and baroreflex sensitivity (Bernardi et al., Circulation 2002; Lancet 1998). I wanted a frictionless daily habit tool — no app store, no account, no subscription, just open terminal and go.Design constraints, all grounded in the clinical literature:- No breath retention — Valsalva risk in cardiac patients- No rapid breathing — minimum 8-second cycles- Exhale ≤ 2x inhale — no evidence for extreme ratios- Immediate exit, always — q or Ctrl+C restores the terminal even on crashThe README includes a resonance frequency measurement protocol for anyone with a chest-strap HRV monitor who wants to find their individual optimum instead of using the 6 bpm default.macOS only (uses afplay for audio cues). MIT licensed.pip install breathe-cliorbrew tap marekkowalczyk/breathe && brew install breathe.
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A minimal macOS terminal app that guides users through paced resonance breathing to improve cardiac vagal tone without dependencies or friction.
The pain
The gap
Build angle
Strengths
- Clinically grounded design constraints tailored to cardiac safety
- Extremely low friction: no accounts, no subscriptions, no app store
- Open source and MIT licensed, encouraging trust and transparency
- Simple installation via pip or Homebrew
- Supports resonance frequency customization for advanced users
Risks
- Limited to macOS, excluding a large potential user base on Windows/Linux/mobile
- Terminal-based UI may intimidate or deter non-technical users
- Niche market: primarily cardiac patients or biohackers familiar with HRV concepts
- No direct monetization or clear business model
- Unclear user retention or engagement without additional features or incentives
Fly Labs Method
Is the pain real, is there a gap, is it the right time, can one person build it.
Value Equation
Dream outcome and how likely it feels, against the time and effort it costs.
One-Person Business
Curiosity pull, identity fit, and a path from free value to paid for a solo creator.
Viral Frameworks
Hook strength, shareability, and how cheaply it can be tested.
Builder Lens
Evidence the problem exists, timing, defensibility, and a model that fits on a napkin.
Five lenses, one composite. How scoring works
The angle
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