DoubleKeys

Save reusable snippets and customize your keyboard toolbar. Optional AI tools add typo correction, voice input, and handwriting-to-text.

DoubleKeys is a Japanese and English keyboard designed for comfortable input from either side. Choose Japanese Roman-letter or flick input, configure each side, and select a color theme.

EVERYDAY TYPING Ordinary typing and Japanese conversion run on device. Options include flick-only entry, voiced and small kana, next-character and reverse-cycle controls, and an emoji panel on either side.

SNIPPETS AND TOOLBAR Save frequently used text in the separate Snippets tab and insert it from the keyboard. The Toolbar tab lets you add, hide, and reorder shortcuts. Overflow scrolls horizontally while More remains available. Actions include Paste, movement to the start/end of a newline-delimited line within host-provided context, snippets, and undoing the last eligible DoubleKeys typo correction.

OPTIONAL AI Enable typo correction, voice input, and handwriting separately. Draw with a finger or supported Apple Pencil. Convert sends only the drawing image to OpenAI; review the result and press Input to insert it. Pen, eraser, stroke undo, clear, and cancellation are available.

AI features require your own OpenAI API key. OpenAI API fees are separate from the app purchase and ChatGPT subscriptions. Keyboard AI networking, Paste, and haptics require Full Access. Ordinary typing and Japanese conversion remain usable without AI or Full Access.

The clipboard is read only after an explicit Paste tap. Pasting or inserting a snippet does not itself send content externally; a later explicit AI correction may send that text as its target. The app does not keep handwriting image or recognition history. Saving voice transcripts is optional, and audio files are not kept as history.

The app interface is mainly Japanese. The keyboard supports Japanese and English; it does not provide Korean input. Available operations depend on the device, host app, and permissions.