Really as similar as possible but I guess the must haves for me are:
- Dark theme
- Swipe to type ability (I usually tap but definitely want swiping as well)
- Searchable emoji’s
- Word suggestions
Nice to have:
- Text editing tools for moving cursor just one character at a time through button presses
- Clipboard button
- Copied text automatically becomes next suggested word the first time the keyboard is invoked after copying the text
- Suggested next word.
You could install TrackerControl and just block internet access to your keyboard.