My favourite calculator

I wasnt expecting much when I picked this up, but its now become my favourite calculator on my iPhone and my iPad when I want to keep track of several calculations and variations. I still use the Apple calculator for quick one-off calculations, because Calculus Doodlus remembers all calculations, and as far as I can tell theres no way to delete a single page or calculation -- the only option is to delete all pages. I wish I could edit a previous calculation by positioning the cursor on a number and changing one digit, with the result of the calculation changing, as I sometimes make mistakes and would prefer to correct the calculation than type it all over again.

Drdul about Calculus doodlus, v1.0.1