Paste a cold email subject line and get an instant, rules-based score in your browser. Built for outbound — spam-filter risk, merge-tag failures, personalization quality, and reply-oriented framing — not newsletter open-rate psychology.
Built from hundreds of live cold campaigns run through FinalOutreach + published industry benchmarks — calibrated for outbound, not newsletters.
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Mobile truncation
Quick question on your Q4 out…
Quick question on your Q4 outbound
Top fixes
Weighted across 15 deliverability and engagement factors.
Verdict
Solid for cold — a few tweaks could push it higher.
Deliverability factors
34 chars — within the mobile-safe cold range.
6 words — cold email sweet spot (2–7).
No common spam triggers detected.
1 ALL-CAPS word ("Q4") — use sparingly.
Punctuation looks restrained.
No emoji — safest default for B2B cold.
No broken merge-tag syntax.
Sentence case — reads like a personal email.
Engagement factors
First-name-only personalization is weak on cold — add a company or trigger detail.
Statement format — questions often pull more cold replies.
No number — concrete figures boost credibility on cold.
No curiosity hook — try why/how or a concrete teaser.
No urgency — fine for cold first-touch.
No tired follow-up phrasing.
Tone reads natural.
Aggregated public industry studies put average cold email open rates in the low-to-mid 20s% as of 2026. A genuinely strong subject line — paired with clean infrastructure — can push toward 45%+ on a warmed domain. Treat those as typical ranges, not guarantees.
Apple Mail Privacy Protection pre-loads tracking pixels for a large share of opens, which inflates reported rates. Reply rate and click-to-open are more reliable signals than raw open rate alone.
Personalized subject lines with real company-specific detail (not just a merge tag for first name) show materially higher open and reply rates than generic ones across recent studies. Subject lines in the 2–7 word range consistently outperform longer ones; all-lowercase / sentence case beats Title Case and especially ALL CAPS.
For the full outbound system behind these numbers — ICP, warmup, sequencing — see the Cold Email Playbook.
| Industry | Relative range |
|---|---|
| SaaS / software | Often highest among B2B cold |
| Professional services | Typically mid-range |
| Banking / financial services | Often lower (trust + filters) |
| Consumer goods / retail | Often among the lowest |
Newsletter testers score for opted-in lists. These factors are weighted for first-touch outbound — spam sensitivity, trust, and reply orientation.
Cold first-touch has low trust. Subjects past ~55 characters get truncated on mobile; past 7 words they start reading like newsletter marketing. Aim for 2–7 words when you can.
Words like “free,” “urgent,” and “limited time” are weighted harder when you are not on a permission list. For a full body scan, use the Spam Word Checker.
ALL CAPS and stacked exclamation marks are classic spam-filter signals and suppress cold opens. Sentence case wins.
Emoji raise filter risk more on cold than on newsletters. Unresolved {{first_name}} or [[Company]] tokens destroy trust instantly — a check newsletter testers rarely prioritize.
First name alone is weak. Company, role, or trigger-event detail is what lifts cold opens and replies in recent industry studies and live outbound practice.
Cold KPI is reply rate. Questions invite a response; numbers add credibility; a light curiosity gap earns the open without sounding like clickbait.
“Checking in” and “following up” get archived. Lowercase starts and conversational phrasing read like a real note. Domain reputation still matters — check Domain Health before you scale volume.
Steal the structure, not the words — swap in your prospect’s company, trigger, or metric.
noticed something on your pricing page
Specific observation without revealing the ask — invites an open.
your competitor's outbound angle
Peer comparison creates a curiosity gap without spam urgency.
cut SDR ramp time by 3 weeks
Concrete outcome + number — specificity over hype.
fewer no-shows on discovery calls
Names a pain operators already feel.
wrong person for outbound at Acme?
Easy yes/no reply — optimized for response rate, not vanity opens.
still owning pipeline at Series B?
Role + stage personalization baked into a short question.
32% lower CAC after list cleanup
Lead with the number; skip the marketing adjectives.
14 meetings from 1 sequence
Outcome-first framing that stays under the mobile cut.
not another demo request
Breaks the expected sales pattern without ALL CAPS or emoji.
permission to send one idea?
Low-pressure ask that feels human on first touch.
Generic email subject line testers (Omnisend, MailerLite, Mailmeteor-style tools) optimize for opted-in lists. Cold outbound fails differently: spam filters are less forgiving when you are not on a permission list, broken merge tags are catastrophic, and the real KPI is reply rate — not vanity opens. This grader weights those cold-specific risks on purpose.
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We weight 15 deliverability and engagement factors tuned for cold outbound, then surface what is hurting opens and replies.
Each failing check explains why it matters on cold email specifically, with a concrete rewrite direction.
Free outreach audit — infrastructure, copy, and targeting reviewed by the FinalOutreach team.
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Generate a 3-step cold email sequence built around your offer and persona.