Character builders

Sly flourish talking char builders and

https://www.levelup5e.com/news/announcing-level-up-gateway

And roll20 has one. Not for phones?
Dnd beyond. 
Foundry … his fav but clunky  
Shard, v good  

Try google 5e char builder. 
Slyflourish says pen n paper..
9:47!seconds to build a lvl 1 fighter.