Peak Flow is a free Android app that helps you record your daily peak flow readings and keep track of your asthma. With the ability to record peak expiratory flow (PEF) and specify if a reading is taken pre or post medication, this app is a great tool for managing your asthma symptoms. You can also record comments against your readings and view your most recent readings at a glance or scroll through your entire history.

One of the most useful features of Peak Flow is the ability to plot your results as weekly or monthly graphs. This allows you to see trends in your readings and identify any potential triggers or changes in your asthma symptoms. The app also automatically calculates and plots your green, yellow, and red zones along with your personal best, making it easy to see if your asthma is under control.

In addition to its tracking features, Peak Flow also allows you to share your graphs over services such as email, Bluetooth, and instant message. You can also export your data to the SD card or upload it to a storage service such as Google Drive. Peak Flow supports both English and German languages.

One thing to note is that the app requires permission to access photos, media, and files in order to export data to local storage. Overall, Peak Flow is a great tool for anyone looking to manage their asthma and track their peak flow readings.