IDE Recommendations???

Hi,

I just got accepted into an accelerator where I have to build a mobile app in 45 days for a school project.

Recommend any app, webapp, IDE that I can use to get a crazy good MVP in a very short period of time (I also plan to put in not less than 20 hrs a week into this project).

So, lay your recs in the comments, thank youuuuuuuu.