Reply was an app by Area 120, Google's experimental workshop and google alpha dev team member Mohit Sahu (mhtshu), released in beta in 2018,[1] (from feb 2018 - 11 oct 2018) (now the experiment has ended) which lets users insert Smart Replies (pre-defined replies) into conversations on messaging apps on their phone such as Facebook Messenger, Slack and Hangouts.[2] Reply suggests various responses to questions or statements that the user's conversation partner make. The suggested replies may vary according to the type of incoming message (detected by the tone, which may trigger "Vacation responder" or "Urgent" types of replies). Or based on the phone accelerometer, Reply can determine if the user is in a vehicle or biking and can auto-respond appropriately. It can also reply appropriately when the user is sleeping.[2] The user can see the suggested responses in their notifications and decide if they want to send one of them from the notification without having to open the app in which the response is sent.[3]