How to add the OnKey keyboard

Adding a keyboard on iPhone takes a few taps in Settings. The OnKey app walks you through it, and this is the same path.

Steps

Install OnKey and open it. Open the app and tap Add the keyboard. It takes you to Settings.
Go to OnKey in Settings. In Settings, open OnKey. If you are in the Settings app already, scroll down the main list to OnKey, or search for it.
Tap Keyboards. Open the Keyboards row.
Switch OnKey on. Turn on the OnKey switch, then come back to the app. The app notices as soon as the keyboard is on.
Try it. Tap a text field, hold the globe key and pick OnKey.

You can also add any keyboard from Settings, General, Keyboard, Keyboards, Add New Keyboard, and choose OnKey from the list.

Do I need Full Access to add it?

No. Typing works without Full Access. You need it for AI actions. See the Full Access guide.

I cannot see OnKey in the list.

Make sure the OnKey app is installed, then open Settings again. If it is still missing, restart your iPhone.