Peak Flow Log: Asthma Diary
Yoshifumi Sato · Health & Fitness
Independent analytics for this App Store listing. AppTracker is not affiliated with Yoshifumi Sato.
Chart standing · US
What changed · US
Listing changes AppTracker has observed for this app in this storefront — new versions, price moves, rating shifts, and store copy.
Thank you for your feedback — this update fixes the problems you reported. • Fixed: Pro couldn't be purchased in some countries, including the US. It can now be bought everywhere the app is available. • New for Pro: Trigger & reliever insights in History — your most common triggers with the average % of personal best on those readings, and reliever use by time of day. • Buying Pro is more reliable: the App Store product is retried if it doesn't load the first time, and the message now explains what to do. • Your history is safer: a single damaged entry can no longer hide your other readings, and an unreadable data file is kept aside instead of being overwritten. • Deleting a reading now asks for confirmation. • Changing the Green zone cutoff no longer resets your custom Yellow cutoff to the default. • Japanese: messages and alerts are now translated.
In-app purchases · US
No in-app purchases.
Screenshots
About
Peak Flow Log turns your daily peak-flow reading into a clear picture you and your doctor can act on. Blow into your own peak-flow meter, type in the number, and the app instantly shows your zone as a percentage of your personal best: - GREEN, YELLOW or RED at a glance, based on your own numbers - Log reliever (rescue) inhaler puffs, symptoms and triggers in one tap - See your trend over time with clear color-coded zone bands - Track more than one person, so parents can follow their child too - Create a clean PDF report to share at every appointment Built to be trustworthy: - Works fully offline. No account, no sign-in. - Your data stays on your device. Nothing is uploaded. - Export and import a backup so you never lose your history when changing phones. - One-time purchase to unlock Pro. No subscription. Free to log and see your zones. Pro unlocks the doctor PDF, unlimited profiles, full 90-day and all-time trends, and custom zone thresholds. Peak Flow Log records and visualizes readings you take with your own meter. It does not diagnose, treat, or provide medical advice, and it is not a medical device. Zones are based on a percentage of your personal best that you or your clinician set. Always follow the asthma action plan given by your doctor, and seek medical help in an emergency.
What's new · 1.0.1
Thank you for your feedback — this update fixes the problems you reported. • Fixed: Pro couldn't be purchased in some countries, including the US. It can now be bought everywhere the app is available. • New for Pro: Trigger & reliever insights in History — your most common triggers with the average % of personal best on those readings, and reliever use by time of day. • Buying Pro is more reliable: the App Store product is retried if it doesn't load the first time, and the message now explains what to do. • Your history is safer: a single damaged entry can no longer hide your other readings, and an unreadable data file is kept aside instead of being overwritten. • Deleting a reading now asks for confirmation. • Changing the Green zone cutoff no longer resets your custom Yellow cutoff to the default. • Japanese: messages and alerts are now translated.
Details