You'd be wrong.
To my knowledge, no simple tool of this kind exists. There are countless complex apps that want something from you and your collaborators — a subscription fee, registration, an email address, your smartphone's private data, permission to send you notifications, and everything in between.
So I built something my elderly father, wife, kids, and less tech-savvy co-workers can use instantly, without explanation from their phones.
The solution is deliberately minimal: just a URL per collaborator, opened in their browser (desktop or mobile) — no new tools, no new habits. The list is the single source of truth; ongoing communication happens through whatever channels they already use: chat, Messenger, email…
I built https://dotolist.eu for myself as a proof of concept — but friends quickly adopted it, and you're welcome to use it for free. It is NOT vibe-coded. It is love-coded in Clojure.
Let me know if you find it useful. :)