One-time password (“OTP”) generation on a smartwatch is provided. OTP generation may include communication between an application on a smartwatch and an application on a smartphone. The request for an OTP may be received at the smartwatch. The smartwatch application may communicate with the smartphone application. An OTP may be generated within a third-party library within the smartphone application. The generated OTP may be transmitted from the smartphone application to the smartwatch application. The OTP may be displayed on the smartwatch.