Calculator App IOS/Android

I'm a guy that wants to raise money to create a ONG that helps childrens with disabilities around the world, i'm on the start of this journey and i'm trying different options to make this possible...i started from working for persons around me and raising some money...to makeing poket callendars and trying to spread them around my city for some donations becouse its extremly expensive to create the ONG legal...and without the legal papers i can't organize no charity events to make my wish of helping childrens possible! so i ask a freelancer that knows how to build an app (calculator app, i have the plans allready in a folder) becouse i think it will get me a step closer to my wish, is a probono (free work if somebody wants to help me)! if a free lancer is interested in helping me, you can send me a message regarding the info's about the app i have in mind that i think with put me a step cloaser to my wih of creating the ONG! https://wearepeople.business.blog/ this is the site i maked in web press and the tiktok page is the same wearepeopleong