Simplenote

Simplenote is a free note-taking app developed by Automattic. It allows users to create and manage plain text notes across multiple devices. Notes are synced in real time through the cloud and can be accessed via mobile apps (iOS, Android), desktop apps (Windows, macOS, Linux), or a web interface.

Key features include tagging, note version history, markdown support, and full-text search. Simplenote does not support rich text or file attachments, focusing instead on speed, simplicity, and reliability.