Keep Apple Notes as is and just add Noti on top.
Your original is untouched. 3 steps, done in minutes.
Migration steps
1
Export your notes
In the Notes app, copy the text or use Share → Save to Files (.txt) to export it.
2
Folders = lists
Recreating your Apple Notes folder structure as Noti lists keeps your categorization intact.
3
Paste into Noti
The moment you paste, expressions like "5월 24일" or "내일 3시" are recognized as event candidates and Noti suggests creating them.
Sync. There is no real-time sync with iCloud Notes itself; you move the text over and then manage it in Noti.
Frequently asked questions
Do checklists carry over?
Checklist text can be organized into to-do items. Formatting is simplified.
Can I use it on my iPhone?
It's a PWA, so adding it to your home screen from Safari lets you use it like an app.