Engagement Decay Half-Life Calculator
Subscribers who haven't opened in N days are deliverability poison. This tool tells you when to suppress.
Suppress threshold (typical): below 10% engagement score, OR after 180 days with zero activity, whichever first.
Sending to cold/dead segments tanks sender reputation faster than the marginal revenue justifies. Re-engagement campaigns to dead segments are the most common reputation-killer.
Applies an exponential decay model to engagement over days-since-last-open. Suggests the suppression threshold (typically 90-180 days for B2B, 60-90 for B2C).
Quarterly list hygiene. Before scaling a re-engagement campaign that might tank your sender reputation.
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You ran the math. Outsolvi makes it real.
Calculators tell you what the number should be. Outsolvi tells you what your number actually is — confidence-scored opens, real reply sentiment, live deal-level signal across Outlook and Gmail. From $7/user/mo yearly, 14-day free trial.
See it on your own inboxNate built Outsolvi after watching every email-tracking tool he had ever used lie to him about opens. Outsolvi runs Tier 1 to 5 confidence scoring on every open, native in Outlook and Gmail, so the number on the dashboard is one a rep can actually act on.
We update these pages when the underlying mechanics change — new mailbox-provider rules, new tracker behavior, new measurement gaps. The dates above are real revisions, not auto-touches.