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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
In-App Purchases

Details

Released
August 5, 2026
Updated
November 1, 2026

Features

Developer

Yoshifumi Sato
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About

Record your peak flow readings and visualize your asthma zones. Log reliever puffs, symptoms, and triggers to track trends and generate PDF reports for your doctor. Your data stays private and works offline.

✓Visualize asthma zones (Green, Yellow, Red)
✓Log reliever puffs, symptoms, and triggers
✓Track trends over time
✓Create shareable PDF reports
✓Offline functionality
✓Multi-user support
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What's New in Peak Flow Log

1.1.0

November 1, 2026

New in 1.1: • Morning & evening reminders — skipped automatically once you've logged that half of the day. • Apple Health — write your peak flow and reliever puffs to Health (one profile, write-only). • Enter three blows and the best one is recorded. • Every save and delete now shows a short confirmation. New in Pro: • Morning vs evening variability, in History and on the doctor PDF. • Your action plan — write what to do in each zone and see it when a reading lands there. • Reliever doses left — your canister counts down from the puffs you log, with a low warning. • Home-screen widget with your latest zone and today's status.

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Subscriptions & In-App Purchases

$3.99

Peak Flow Log Pro

Unlock the doctor PDF, unlimited profiles and more.

User reviews

Most RecentHighest RatedLowest Rated

Meh

Was working great but then stopped and it won’t let me purchase the pro version.
WAWas 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 from your own meter. It visualizes your readings into asthma zones (Green, Yellow, Red) and allows you to log reliever puffs, symptoms, and triggers to track your condition over time.

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, ensuring privacy.

Can I share my data with my doctor using Peak Flow Log?

Yes, Peak Flow Log allows you to create clean PDF reports of your readings, symptoms, and triggers. This feature is available in the Pro version and can be shared at your appointments.

How does Peak Flow Log handle user data privacy?

Your data stays on your device and is never uploaded. The app does not require an account or sign-in, and you can export and import backups to prevent data loss when changing phones.

What features are unlocked with the Pro version of Peak Flow Log?

The Pro version, available as a one-time purchase, unlocks the doctor PDF report, unlimited profiles, full 90-day and all-time trends, and custom zone thresholds. The free version allows logging and zone visualization.

Is Peak Flow Log a medical device?

No, Peak Flow Log records and visualizes readings from your own meter. It does not diagnose, treat, or provide medical advice, and it is not a medical device. Always follow your doctor's asthma action plan.

How often is Peak Flow Log updated?

The latest version, 1.0.3, was last updated on October 29, 2026. The app was initially released on August 5, 2026.

What devices does Peak Flow Log support?

Peak Flow Log is currently supported on iPhone devices.