I already wrote about AppInventor being fun even for absolute beginners in programming (perhaps not even knowing the meaning of this word): it’s like using Scratch (from MIT) supercharged — your mobile doing the things you want to (and mobiles can do a lot of things!). As for myself, I like the democratic project goal very much too.
AppInventor only being available for Android was some annoyance (in fact mainly for me as I am using an old 4s). As MIT started a crowdfunding to start developing ending 2017 I was thrilled and donated a small amount. The team thought they could do it until mid of 2018 but this was too optimistic.
Now there is a new release date — early 2019! You can watch their progress here!