Pony Express HQ is a text message marketing platform that allows small businesses, clubs, non-profits, dispensaries, and communities to send and receive messages. It offers features such as cross posting, contact syncing, group SMS, real-time messaging, MMS, scheduling, message templates, URL link tracking, integrated forms, and customization. Users can segment their audience by creating keywords and setting up automated responses. The platform allows users to add subscribers by syncing contacts or uploading a CSV file with existing applications such as Outlook or Gmail.