Cloud Outliner
7.7#4 in study timer apps$4.99 one-timeFree planiOSmacOS
VisitNo prices published.
Cloud Outliner suits people who want structured notes for plans, projects, or ideas on iOS or macOS. It may also fit users who need search, filtering, exports, or outline syncing, though Pro is needed for some sync options.
You want what its maker publishes above — check its page for the details.