Could be better
There is no provision to input stud dimension's eg 4”x 2” or 90mm x 45mm, 70mm x 35mm. As this will make a difference to the number of studs in the wall.
Whilst using the app, if I put in a wall length of 4m and a stud spacing of 0.5m, the app says i need 94 studs. This is very clearly wrong !
More thought need to be put into this app development ! Maybe consult with a qualified licensed builder or a civil engineer.