Send Time Optimization is an Iterable AI tool that helps you send email and push notifications right when your contacts are most likely to open and read them. For each of a campaign's recipients, it uses machine learning to analyze historical engagement behavior and select an optimal, per-person send time.
For email campaigns, Send Time Optimization attempts to maximize the Email Open Rate (Unique Email Opens or Clicks / Total Emails Delivered) and Email Click Rate (Unique Email Clicks / Total Emails Delivered) metrics.
For push notification campaigns, it tries to maximize the Push Open Rate (Unique Pushes Opened / Total Pushes Delivered) metric.
Overview
As you're using Send Time Optimization, remember that:
- STO optimizes send times based on project-specific data. It does not analyze cross-project data for the same contact.
- Optimized send times always fall at the top of the hour.
- STO uses a 50/50 control/variation split for Send Time Optimization experiments. This is not adjustable.
- For users with insufficient historical project data from which to derive optimized send times, Iterable sends campaigns at their configured send times (even if you've enabled Send Time Optimization).
- Iterable updates its Send Time Optimization machine learning models once per week, using the newest available data for each project and weighting recent data more heavily. All models are updated over the course of the week and not on any set schedule.
- STO does not guarantee higher engagement. :::
Learn more
To learn more about Send Time Optimization, read the following guides:
-
Blast email and push notification campaigns
- Blast email campaigns can also use Send Time Optimization experiments
- Triggered email and push notification campaigns
- Workflow Send Email and Send Push nodes
NOTE
Triggered email and push notification campaigns, and Send Email and Send Push workflow nodes, cannot use Send Time Optimization experiments.
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