The Ancient Greek Keyboard allows you to enter ancient Greek characters and diacritics.

Main features of the app are typing ancient Greek diacritics, reference and editorial marks (Ͻ, Ͼ, Ͽ, ※, ⸖), composite or decomposed characters, word suggestions, validate diacritic entries, light and dark themes.

Also contains numerals and other extra characters that can be accessed by long-pressing keys. Κ contains ϗ and Ϙ. Υ⁶ contains Ϝ and Ϛ. Ο⁹ contains Ϟ, Ϡ and Ͳ. Π⁰ contains numeral signs ʹ (Keraia) and ͵ (Left Keraia).

Once installed, enable the new keyboard via the prompt, or in the System Languages Settings. Go to Languages & input > On-screen keyboard > Manage On-screen keyboards. To switch between keyboards long press on the space bar, or press the keyboard icon in the action bar.

The word suggestions are from source material. There are over 160,000 words including their various inflections.