HbA1c Logbook allows you to enter HbA1c (Glycated hemoglobin) measurements over time and displays the readings on a graph. You have the option to store multiple people on a single device. There are no adverts and data is only stored locally on the device with an option to export data.
This app will always be free and contains no paid features, but please consider making a small donation to Life for a Child an International Diabetes Federation programme, whose aim is that no child should die of diabetes because of lack of access to insulin.