A free program for Android, by RodXander.

This is a blood pressure (BP) app that helps you track and log your BP. The app supports all the major BP ranges (from normal to very high or low BP). It also provides an extensive database of information about the normal BP ranges for different age ranges and sex.

It supports many different blood pressure measurement devices, including sphygmomanometers, electronic weighing scales, and pulse oximeters. The app also supports many different tags and provides you with several different ways of logging your measurements, like by date, time, tag, or simply the reading itself. You can also add your own notes to each measurement.