Ouija calculator plus gives more option to calculate bit hydraulics comparing to Ouija calculator (unit sets - imperial, metric, mixed), which makes it easier to use on different rigs with different inputs. And also there is an option of 3 different nozzle sizes.
Note that the keyboard will be dismissed on the drag gesture (drag finger across the screen).
Toolfaces are in the range -180/180.
If there is an interest in hole hydraulics (sufficient cleaning) you might want to check "Drill Hydraulics" (free).