I’ve been using https://www.budgetwithbuckets.com/ for a couple of years.
It’s very similar to YNAB and has a full-featured, indefinite free trial. (And the paid version is one-time ~$60, if you want to support the developer.)
It also has optional bank syncing for $1.50/month.
Here’s the writeup from GiveDirectly itself: https://www.givedirectly.org/2023-ubi-results/
You can also donate to them. They provide direct cash transfers to the worlds’s poorest communities, as well as ongoing research into the effects of things like UBI.