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Peak Flow Log: Asthma Diary

Peak Flow Log: Asthma Diary

Zones, reliever log & PDF

1 ratings
1 review
💪 Health & Fitness
Free

Details

  • Released
  • Updated
  • August 5, 2026
  • September 11, 2026

Features

Developer

Yoshifumi Sato
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About

Record your daily peak-flow readings to visualize your asthma zones and track symptoms. Log reliever inhaler use and triggers with a single tap. Generate PDF reports for your doctor and monitor trends over time.

✓Visualize peak flow zones (Green, Yellow, Red)
✓Log reliever puffs, symptoms, and triggers
✓Track trends over time with color-coded bands
✓Support for multiple user profiles
✓Generate shareable PDF reports
✓Offline functionality with no account required
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What's New in Peak Flow Log

1.0.1

September 11, 2026

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.

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User reviews

Most RecentHighest RatedLowest Rated

Meh

Was working great but then stopped and it won’t let me purchase the pro version.
Was A Fan of AppWas A Fan of App

Response from developer

Thank you for the feedback, and we are sorry for the trouble. We found the cause: the Pro upgrade was mistakenly available only in some regions, so it could not load for you. This is now fixed on our side, and no app update is needed. Please try upgrading to Pro again from the app. Your readings are safe, and recording always stays free. An update with further improvements, including new trigger and reliever insights for Pro, is also on the way.

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FAQ

What is Peak Flow Log used for?

Peak Flow Log helps you record your daily peak-flow readings, visualize your asthma zones (Green, Yellow, Red), log symptoms and reliever inhaler use, and generate PDF reports for your doctor. It aids in managing your asthma by providing a clear overview of your respiratory health.

Does Peak Flow Log require an internet connection?

No, Peak Flow Log works fully offline. It does not require an account or sign-in, and your data stays on your device. This ensures privacy and accessibility even without an internet connection.

What features are unlocked with the Pro version?

The Pro version of Peak Flow Log, available as a one-time purchase, unlocks the doctor PDF report feature, unlimited profiles for tracking multiple individuals, full 90-day and all-time trend views, and custom zone threshold settings. The free version allows logging and zone visualization.

Can I track my child's asthma with Peak Flow Log?

Yes, the app supports tracking more than one person, allowing parents to monitor their child's peak flow readings and symptoms. This feature is particularly useful for managing pediatric asthma.

How is my data protected in Peak Flow Log?

Your data is kept private and secure as it stays on your device. The app does not upload any information, and you can export and import backups to prevent data loss when switching phones. No account or sign-in is necessary.

What is the update frequency for Peak Flow Log?

Peak Flow Log was last updated on September 11, 2026, with version 1.0.1. While specific update frequency isn't detailed, this indicates ongoing development and support for the application.

Is Peak Flow Log a medical device?

No, Peak Flow Log records and visualizes readings from your own peak-flow meter but is not a medical device. It does not diagnose, treat, or provide medical advice. Always follow your doctor's asthma action plan and seek medical help in emergencies.

What devices does Peak Flow Log support?

Peak Flow Log is currently supported on iPhone devices. The app is designed for iOS users who want to manage their asthma tracking on their mobile phones.