A quarterly ranking of how brands treat the inbox they were invited into. Every figure comes from email a Siftbox panel inbox actually received, never from scraping a website, and every claim traces to a specific message with its date and subject line. The grade is the Siftbox Score, out of 12.
51 brands scored on Restraint, Urgency and Sale permanence.
Read the edition →45 newsletters scored on Cadence, Volume and Sales pressure.
Read the edition →Four bands, one question: when this brand hits send, what is it putting first?
Siftbox sells a solution to the problem this index measures.
That sentence leads the methodology on purpose. The index is free, brands are never contacted before publication, and no brand is ever offered a way to change a score.
The panel. Siftbox operates a panel of subscriber inboxes that sign up to brand newsletters the way any customer would: an email form on the brand's own site, no account created, no terms assented to. Brands requiring a registered account are excluded.
The Siftbox Score. Three dimensions per edition, 0 to 4 each, out of 12, permanently. Always written with its scale. Scores compare within an edition, not across editions: the two editions measure different dimensions on the same scale. Past editions are never restated.
Auditable where it cannot be reproducible. Nobody can re-check a send rate without their own panel, so each edition publishes its receipts: counts, dates and subject lines beside the scores.