August 5th, 2025

Enhanced STO Support for WhatsApp

We’re excited to announce enhancements to Send Time Optimization (STO) with newly added support for the WhatsApp channel, expanding on our existing capabilities for Email and App Push Notification (APN). These improvements enable better targeting across revenue-critical channels and empower marketers with more precise control.What’s New

  • WhatsApp Channel Support: STO is now available for WhatsApp campaigns, in addition to Email and APN.

  • Revamped Models for Email & APN: We’ve enhanced our STO engine for Email and APN to deliver more accurate predictions and improved results.

  • Smart Timing: Messages are sent during each user’s highest engagement window within a 24-hour period, increasing opens and conversions.

  • Predictability-Based Segmentation: Segment users into predictable and unpredictable groups using time bucket analysis to design more effective journeys.

To learn more, refer to our STO documentation