BreatheSafe
Don't just read AQI, Recover too
What it does
AQI 400+ can reduce lung function within hour. Most people still go out unprotected. I built a simple tool that: → Calculates real health impact → Recommends proper mask type
Does the same job
all alternatives →- IMI'm a doctor and made a responsive breathing app for stress and anxiety2023 · lungy.app · ▲666
Hey HN! Some more info: I’m an NHS doctor and the founder of Pi-A (https://www.pi-a.io) which developed Lungy (https://www.lungy.app). Lungy is an app (iOS only for now) that responds to breathing in real-time and was designed to make breathing exercises more engaging and beneficial to do. It hopefully has many aspects of interest to the HN community – real-time fluid, cloth and soft body sims running on the phone’s GPU. My background is as a junior surgical trainee and I started building Lungy in 2020 during the first COVID lockdown in London. During COVID, there were…
- MCMy city makes me smoke 40 cigarettes per day2024 · air.nmn.gl · ▲20
My city is dying and no one cares. I live in Delhi and it recently hit AQI 1000 - equivalent to smoking 40+ cigarettes daily. Yet people around me still believe you can "build immunity" to air pollution. Frustrated by this dangerous misconception, I built an open-source tool that translates abstract AQI numbers into metrics people viscerally understand: cigarettes you're unknowingly "smoking" and hours of life lost each day. Features: - Real-time conversion of AQI to cigarette equivalents - Daily life expectancy impact calculation - Location-based tracking Live demo:…
- EBEvery Breath You Take – Heart Rate Variability Training2023 · github.com · ▲348
Through controlled breathing it is possible to regulate your body's stress response. I've built an app to measure and train this effect with a Polar H10 Heart Rate monitor. With every breath you take, you can set the pace of your breathing rate, measure your breathing control with the chest accelerometer, and see how heart rate variability responds.
- BCBreathe CLI – Paced resonance breathing in the macOS terminalMay 2026 · github.com · ▲132
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…
BioBreathe: Breath & Pelvic Trainer2025 · ▲118Not AI-powered. Built for my wife. Simple & Science-backed.
More life & fun this month
the category →- TL
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Your multimedia mentor that takes you from mid to great
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Launched alongside, March 2026
the whole month →
Switch from ChatGPT to Claude with import memory feature
AI · Mar 2026 · claude.com
