Alternatives

HackMD vs Skiff

Both use Markdown which have more functionality than doc based files.
Skiff has better security
- Multi-factor authentication
- End-to-end encryption
Skiff can import multiple files from the local computer.
Skiff has a better UX
- Skiff has a GUI to handle Markdown.
- Auto-light/dark modes based on settings.
Skiff has more investment and resources to build from $14.2mm of fundraising.
HackMD has better publishing tools.
- Custom urls
- Upload to Arweave
HackMD has better version control with GitHub.
HackMD has better export all files feature.

HackMD is more decentralized
- HackMD allows for an easy download of all notes in .md file format.
- The .md file format is preserved when downloaded and can be hosted publicly easier than Google's downloaded universal .docx files.
HackMD .md files have more native functionality
- Code blocks
- Embed
  - GitHub Gists
  - Figmas
  - PDFs
  - Mathematical equations
- Quoted text sections
- Set browser behavior: Supported YAML metadata
HackMD has better version control with GitHub integrations

This is not technical advice. Always read the official documentation and do your own research.