The most common free options are:
| Method | Platforms | Difficulty |
|---|---|---|
| iCloud Drive | Mac + iOS | Easy |
| Dropbox / Google Drive | All (iOS has limitations) | Easy |
| Syncthing | All (self-hosted) | Medium |
| Git + Obsidian Git plugin | All | Medium |
Third-party sync can cause conflicts if you edit on two devices at the same time. Obsidian Sync, which costs $8/month, handles conflicts more gracefully and includes end-to-end encryption.