Korean

Switch on 한국어 and the keys show Hangul jamo in the two-set layout (두벌식), where a Korean keyboard has them:

 ㅂ ㅈ ㄷ ㄱ ㅅ ㅛ ㅕ ㅑ ㅐ ㅔ
  ㅁ ㄴ ㅇ ㄹ ㅎ ㅗ ㅓ ㅏ ㅣ
   ㅋ ㅌ ㅊ ㅍ ㅠ ㅜ ㅡ

Each tap types exactly its jamo. Korean has no autocorrect.

• Flick up for the doubles, where a Korean keyboard uses shift: ㅂ ㅈ ㄷ ㄱ ㅅ give ㅃ ㅉ ㄸ ㄲ ㅆ, and ㅐ ㅔ give ㅒ ㅖ. They are drawn small at the top of those keys. Holding the key offers the double too.
• Flick down for the digit or mark drawn under the key, as in every language.
• Syllables build as you type: ㅎ ㅏ ㄴ → 한. A vowel after a final consonant takes it over: 한 + ㅏ → 하나. Compound vowels and double finals build from pairs.
• Deleting removes one jamo at a time while you're typing a word.
• The strip completes the word you're typing. Tap one to type it with a space.

Korean has no next-word predictions, no capital letters and no text shortcuts. Everything runs on your phone.