Heymarket offers the ability to schedule messages from the Android and iOS Mobile app.
How to schedule a message - iOS
Scheduling a message to send at a later date through the Heymarket iOS mobile app is easy — to get started, touch the plus sign to the left of the text field to open up the message options menu.
Then, select Schedule Message.
You can use the date and time wheel to pick the date and time you wish to send the message. Once you’ve set selected the desired date and time, click schedule message.
You can confirm that the message has been successfully scheduled directly below the conversation. To update the scheduled date and time, or to make edits to the message, select see message.
If you wish to delete the schedule message, click the trash icon to the right.