Klaviyo: Klaviyo offers Personalized Send Time, a feature that uses reinforcement learning to automatically deliver each marketing message — email, SMS, push, or WhatsApp — at the individual time when that specific recipient is most likely to open and engage. It was confirmed generally available as of Q4 2025. | AI Trace
Productivity AutomationVerified
Klaviyo offers Personalized Send Time, a feature that uses reinforcement learning to automatically deliver each marketing message — email, SMS, push, or WhatsApp — at the individual time when that specific recipient is most likely to open and engage. It was confirmed generally available as of Q4 2025.
Details
Rather than sending a campaign to the entire list at a single fixed time, brand marketers enable 'Personalized Send Time' and Klaviyo's model determines the optimal delivery window for each individual subscriber based on their historical open and engagement behavior. The feature uses reinforcement learning, which means it updates its predictions as it receives new engagement data over time. According to Klaviyo's AI overview page, the system is one of the platform's longest-standing AI features, predating its generative AI capabilities by several years.
