Film Developer Timer Pro
It seems to be a well constructed app, especially the timer. However, I am worried abou tthe accurarcy of the data. For example, to develop Ilford HP5+ in Ilfosol 3 at 20ºC the timer specifies 3mins 15 secs with agitation every 30 seconds. The app says that this is based on data from Ilford. . I checked other sources including Ilford on line and the recommended time is 6 mins 30 secs. This calls into question the accruracy of all of the times.