What this website does with your visit
Nothing. There is no analytics script, no cookie, no tag manager, no embedded video, no web font served from somebody else's domain, and no form to fill in. The page you are reading is static HTML and CSS, and it makes no requests to any host but this one.
That is not a promise about intent — it is a property of what shipped. The site's
Content-Security-Policy sets script-src 'none' and
connect-src 'none', so a script or a network call added by accident would
not run quietly; it would visibly fail.
What the host can see
The site is served by a hosting provider, which — like every web server — records the requests it answers, including IP addresses, in its own logs. That is the ordinary operation of a web server rather than a choice made here, and there is no way to serve a page without it.
The apps are covered elsewhere
This page is about the website. What each app stores, and what leaves your phone, is a longer and more important question, and it is answered where it belongs: on couchtime.app for CouchTime, and on trovva.app for Trovva. Restating them here would create a second copy to go stale.