<i>ykDroid</i> is a USB and NFC driver for Android that exposes the

challenge-response feature of YubiKeys for use by other Android apps. Both

USB and NFC (YubiKey NEO required for NFC) are supported on compatible

devices.

Apps supporting it include e.g. Keepass2Android and

<a href="https://github.com/noliran/ykpass">ykpass</a>.

Creator