"Run PB Free" is the free version of 'Run PB'. The difference between the apps is that the full version gives additional functionality (i.e. plots of runner's times and the ability to email times). The full version also doesn't display ads."Run PB" is used to keep a historical record of a runner's (or a group of runners') times - results for distances from 50m to 10km (including hurdles and steeplechase) can be stored.When a time for a race (e.g. 50m, 100m, 100m hurdles etc) is entered for a runner, the app compares the time to the one previously stored for this race and informs the user if the time is faster, slower or no previous time exists for this race.In addition to the list of all the runner's times, a list of the runner's current Personal Best times for all races can be shown.Runners and races in the runner's historical list can also be re-ordered and deleted if required (using the 'edit' button).