Peak Flow allows you to record your daily peak flow readings and helps you to keep track of your Asthma. Features - Record peak expiratory flow (PEF). - Specify if a reading is taken pre or post medication. - Record comments against your readings. - View your most recent readings at a glance or scroll through your entire history. - Plot your results as weekly or monthly graphs. - Automatically calculate and plot your green, yellow and red zones along with your personal best. - Share your graphs over services such as Email, Bluetooth and Instant Message - Export your data to SD card or upload it to a storage service such as Google Drive. - Support for English and German languages. Required Permissions - Photos / Media / File - This permission is required to allow Peak Flow to export data to local storage.