Every mailer, call, and text.
One source of truth.
Signalstack pulls email, phone, and SMS activity from every vendor you run, resolves duplicates into a single contact, and tells you exactly who to skip on the next drop.
One clean contact record, six ways it pays off.
Import from anywhere
Drop a CSV from your mailer, dialer, or SMS vendor. Signalstack maps columns once and remembers.
Identity resolution
Email lowercase, phone E.164, provider IDs — we merge duplicates deterministically and let you review the fuzzy ones.
Unified timeline
See every touch on one contact, in order, colored by channel.
Suppression that pays for itself
Positive responses, opt-outs, and conversions flow into your do-not-contact list automatically.
Channel effectiveness
Cost per response by channel and campaign. Know which vendor to renew.
Recommended next action
Rule-based, explainable, per contact. No black box.
From messy CSVs to a clean drop list in four steps.
Add your mailer, dialer, or SMS vendor as a data source.
Drag-and-drop mapping. Save the template so next time is one click.
Deterministic merges run automatically; you review only the fuzzy edges.
Export a suppression-aware drop list for your next campaign.
Ready to stop double-touching your list?
Import your first CSV in under five minutes. Free while you evaluate.