thoughts.page costs $5/month for anyone making more than $40,000 USD/year (after taxes), and is free for everyone else.
this is an attempt to make thoughts.page accessible to people regardless of whether they have a job/live in a place with a globally strong currency/etc. it obviously isn't perfect — there are people making more than $40,000/year for whom $5/month is an undue burden, and there are people making less than $40,000/year who can easily afford $5/month. but it's not like i'm checking, it's basically pay-what-you-want with $40,000 as a suggested cutoff for paying.
you're welcome to try it out for a week or so without paying, if you want to see what it's like :)
you can adjust your billing plan in your settings.