Subject Line Scorer that picks the winner
Paste up to 5 subject lines. Get transparent sub-scores, real Gmail and Outlook previews, and 5 frame rewrites grounded in what actually books meetings.
Deterministic engine plus Gemini reasoning
Score first. Email only to unlock rewrites.30 seconds. Send-ready output.
JD
AK
ML
RP
Trusted by leading revenue teams. Scores grounded in real spam triggers and inbox truncation, not vibes.
Live scoring
5 subjects · cold outbound
Grading
| Subject Line | Score |
|---|---|
| A Quick question about Acme's RevOps stack | 92 |
| I Saw your Series B — 3 ideas | 88 |
| A Free trial inside!! Limited time! | 28 |
Gmail mobile preview
Quick question about Acme's RevOps…
Noticed your team is hiring 3 SDRs — wanted to share what's working at…
Rewrites by frame
- Curiosity
- Specific
- #Trigger event
- Pattern interrupt
- Peer drop
Audience (optional)
Send context:
- Cold outbound
- Nurture
- Reply bump
- Event invite
Who are you writing to? Calibrates spam, specificity, curiosity, and formatting penalties.
Persona
- C-suite
- VP / Director
- Manager / IC
- Technical buyer
- Consumer / B2C
Industry
- SaaS / Tech
- Finance
- Healthcare
- Legal
- E-commerce / D2C
- Manufacturing
- Education
- Nonprofit
- Other
Subject lines (1 to 5)
Add another
Preheader (optional)
Scored together with the subject so they don't echo each other.
Subjects are the start. Pipeline is the finish.
AI Engage™ writes subject lines, opens, and follow-ups personalized to each account, then routes the replies to a human in the loop.