Your account is ready — the three things to do first
Welcome aboard. Your workspace is live. Three quick steps will get you to your first result: connect a sending domain, import a list, and run one test.
Pre-send email testing for marketers and agencies
Test before
you send,
not after.
Send two to five versions to readers you choose. See how they read, what they say, and whether the evidence supports sending one.
Variant comparison
Select a variant to inspect its evidence
Example 1 of 3. Sample study data. Variant A selected — Control. Subject line: “Your account is ready — the three things to do first”. Trust 4.7, Clarity 4.7, Action intent 4.3, CTA clicks 6, based on 6 responses. Release gate: Go — All conditions met. Recommendation: Send Variant A — A outperforms B on trust, clarity and action intent, with 3× the CTA clicks across the same number of responses.
You bring the reviewers
Teammates, customers, or anyone you share one link with. No account, no install. One recruitment link spreads readers evenly across your variants.
How it works
1
Create
Build two to five variants — subject, preview text, body and call to action — in one test.
2
Share
One tokenized link per variant. Reviewers open it and read. No account, no panel, no install.
3
Measure
Opens, scroll depth, clicks and completion as they read, then trust, clarity and intent once they finish.
4
Decide
The release gate returns Go, Conditional, Wait or Stop — and shows the evidence it used.
How it decides
How SigSent turns responses into a decision.
Behavioral signals
See how people actually engage, not only what they say afterward.
Opens, scroll depth at 25 / 50 / 75 / 100, CTA clicks, completion and abandon — recorded per session and attached to one variant.
See in sampleDirect feedback
Ask the right questions while the message is still fresh.
Trust, clarity and action intent on a five-point scale, plus a recall question and an optional comment. One response per session, no double-counting.
See in sampleRelease gates
Fixed thresholds. SigSent tells you plainly whether they were met.
Three responses before an early leader is named, five before the gate returns anything but Wait. When the gap is under threshold it says too close to call, not “winner”.
See in sampleAI
AI grounded in human evidence.
Evaluated assistance
AI drafts and refines. Reviewers decide. Every rewrite is tested the same way the original was.
Deterministic checks
Thresholds are fixed rules, not model judgment. The same evidence always returns the same decision.
Grounded recommendations
Suggestions cite the sessions, scores and quotes behind them — your reviewers, not a model’s taste.
Security
What we protect, and what we do not collect
Reviewer privacy
Reviewers are never asked for a name or email; we do not record IP location. There are no advertising or cross-site tracking cookies.
Protected secrets
Credentials and secrets are encrypted at rest with AES-256-GCM.
Access controls
Review links expire on the date set when they were created, up to 30 days. Named processors are listed in Privacy.
Connects to
Mailchimp
After Go, push the winner
Send the leading variant into Klaviyo, Mailchimp, or HubSpot as a draft. Your ESP still owns the send.
Pushed from Signal Lab · Go
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Send the version people actually respond to.
Real readers, fixed thresholds, and a decision you can show your client.