Peak Flow

Peak Flow is a manual journal for readings from your peak flow meter.

Enter the meter value and the personal best you want to use. The app remembers your current best for the next entry. Every saved reading keeps its own personal best and percentage, even when your current best changes.

Add optional Before medication or After medication context and a note. Leave timing unspecified when it does not apply. Edit the measured date, time or a saved reading when needed.

REVIEW YOUR RECORDS
Choose 7 days, 30 days or all history, then filter by medication timing. Review the same selection as a list, an average/range summary, a dated L/min graph or a CSV report. The graph shows up to the latest 30 readings and labels the recorded times. Historical personal-best values stay attached to their original readings.

YOUR DATA AND RECOVERY
• Your journal stays on this device
• No account is required
• Android may back up the local journal to your Google account when device backup is enabled and your device has a screen lock; Google controls when backups run
• Export a JSON backup from Settings for a copy you control, and import it later to merge or replace the local journal
• Backups from earlier versions remain supported

FREE WITH A SIMPLE UPGRADE
The free app includes advertising. A one-time purchase removes ads permanently. All logging, history, graphs and recovery features remain available without that purchase. There is no subscription.

Peak Flow does not measure anything itself and is not a medical device. Percentages and recorded bands are calculations from the personal best you enter, not a diagnosis, action plan or medical advice.

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