Lortu ("Achieve" in basque) allows users to visualize their data as plots. Import, export, and traverse your plots to understand your data.
If you like to measure and track your data, this app is for you. Be it your weight, the time it takes you to do 100m swimming, or the kilometers you run each day, this is the right app to track your progress.
The data is stored locally, but can be brought to a different device by creating a backup and then restoring it in the second device.