Wonderful idea, it looks great so far.
I appreciate that the list of charities one can donate to is relatively restricted since this prevents people from publicly donating to highly political charities for signalling purposes.
I also like that there is a dashboard showing how your donations are being spent.
One thing I find a little strange is the “lives saved” total (whereas the “CO2 Reduced” total seems perfectly normal to me). I don’t have a good reason for this, its just a personal feeling. Perhaps instead show the total spent or fraction spent on different causes areas rather than assert the overall impact of the donations?
Which of your writings (including things like blog posts) do you consider most important for making the world a better place? Assuming many people agreed to deeply consider your arguments on one topic, what would you have them read?