[vegesm]

As others said, the active number of downloads is way lower (50k). Even then, I'm pretty bad at marketing and have no idea how to grow it or optimize the monetization.

It seems from 10 ideas 9 doesn't work and even the 10th brings only modest results.

[jack_pp]

Probably because the user base is by definition pretty small. I never used a graphing calculator and neither see any use for it but those who do use it and know what it is have probably found it already. Seems to me marketing for such a niche product has very fast diminishing returns.