Here are five subject line options for the product update email, ranked by predicted open rate:

1. Workflows are live: automate your first task in 5 minutes
2. What your team can now run on autopilot
3. New: schedule agents like you schedule meetings
4. Product update: Workflows, audit logs and 12 fixes
5. See what shipped in October

Option 1 matches the pattern of our best performing sends, which pair a concrete benefit with a time frame.

Three variations of option 3 as a question:

1. Why not schedule your agents like meetings?
2. What if your agents ran on a calendar?
3. Ready to schedule your first agent?

Past sends favor option 1's pattern:

Option 4 matches the second row, so option 1 should win by about 17 points.