My experience with Stashaway is that it has a great UI, and it works. I think it's a great option for young investors or young working adults who like to have a hassle-free choice to park and grow your money. (Read on to know more)
From memory, the onboarding process was not a hassle and everything was fairly streamlined.
The app ask for your goals so they can set up a portfolio for you and also assessed how risk-adverse(or lack of) that you are so they can create one that is in-line with your goals and the amount of risks they think you should undertake.
They care for the users such that if your level of risk you want to undertake is not recommended by the app, you would have to go through some short videos... to undertake the relationship between risks and returns, investment timeline etc and contact the customer support to UP the risk of the portfolio in return for more potential returns. (Prompt Customer Support done via Whatsapp/Phone/Email channels)
The concept of risks is normally a turn-off for newbies to investment but Stashaway does a great job packaging it in it a palatable way and appealing to freshcomers to investing and growing money outside of a bank's very poor annual interest.
Like with all investments, please Do Your Own Diligence and do not expect overnight returns rather, expect better gains when holding and investing in the portfolio as time goes by!