Primitive 09 / Send time optimizer

Send time optimizer

A 12-week heatmap of historical open rates by hour-of-week. The recommended window is highlighted as a chip, with an override row for picking a specific hour manually.

Production answer

Send time optimizer is a reusable Oak Flats Muffler Men UI primitive with documented states, accessibility expectations, theme behavior, and implementation evidence.

Primary CTAReview Send time optimizer states
Generative search brief

Send time optimizer: A 12-week heatmap of historical open rates by hour-of-week. The recommended window is highlighted as a chip, with an override row for picking a specific hour manually.

Live primitive
Send-time optimizer
Historical open rate by hour of weekHeatmap of 84 days across 12 weeks. Max value 78.MonWedFri2026-03-01: 262026-03-02: 632026-03-03: 302026-03-04: 552026-03-05: 222026-03-06: 232026-03-07: 282026-03-08: 292026-03-09: 652026-03-10: 282026-03-11: 512026-03-12: 222026-03-13: 262026-03-14: 302026-03-15: 312026-03-16: 642026-03-17: 242026-03-18: 512026-03-19: 242026-03-20: 292026-03-21: 312026-03-22: 312026-03-23: 602026-03-24: 222026-03-25: 542026-03-26: 272026-03-27: 312026-03-28: 302026-03-29: 282026-03-30: 562026-03-31: 222026-04-01: 602026-04-02: 302026-04-03: 312026-04-04: 272026-04-05: 252026-04-06: 552026-04-07: 242026-04-08: 672026-04-09: 312026-04-10: 282026-04-11: 232026-04-12: 222026-04-13: 582026-04-14: 272026-04-15: 722026-04-16: 302026-04-17: 252026-04-18: 222026-04-19: 222026-04-20: 642026-04-21: 302026-04-22: 732026-04-23: 272026-04-24: 222026-04-25: 222026-04-26: 232026-04-27: 702026-04-28: 312026-04-29: 712026-04-30: 242026-05-01: 222026-05-02: 252026-05-03: 262026-05-04: 762026-05-05: 302026-05-06: 672026-05-07: 222026-05-08: 232026-05-09: 282026-05-10: 302026-05-11: 782026-05-12: 272026-05-13: 642026-05-14: 222026-05-15: 262026-05-16: 312026-05-17: 312026-05-18: 762026-05-19: 242026-05-20: 632026-05-21: 242026-05-22: 292026-05-23: 31
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Open-rate lift+24% opens vs avg
Override hour