Google Keep is a free note-taking app known for its integration with the Google ecosystem, supporting voice notes, drawings, and reminders with a minimalistic design. MS OneNote allows users to create Notebooks for effective categorization of notes and is also available for free. ColorNote features color-coding for easy note organization and offers online syncing and note locking with a Google account, and is free to download. Evernote supports various formats like standard notes, sketches, and audio recordings, and offers a free plan with limitations, along with a paid Personal plan for more features. Notion is a comprehensive note-taking solution that allows for detailed notes with icons, attachments, and sub-pages, available for free but may require a learning curve due to its extensive features.