Agenda vs flatnotes

Agenda is a date-focused note-taking application for macOS, iOS, and iPadOS developed by Momenta B.V. It organizes notes along a timeline linked to calendar events, combining note-taking with scheduling and task management. The app syncs via iCloud or Dropbox and supports rich text, attachments, tags, and collaboration.

flatnotes is a note-taking tool that self-hosted markdown note-taking app that stores notes as plain files with no database required. It is open source software.