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Five cold email subject lines, two words or fewer.

Paste prospect context. Get five short subject lines that hit the 1 to 4 word optimal length window backed by Gong's 85M-email dataset.

The context

The more specific your email body, the better the subject.

Describe what your email actually says, not what you wish it said.
Fill all required fields

The subjects

1 to 4 words is the optimal length window per Gong's 85M-email study.

Fill the form and click Generate. Output appears here.

Sources & methodology

Every number on this page links to a primary source

We cite original studies (Ehrenberg-Bass, RAIN Group, HubSpot, Bridge Group, Instantly, Belkins) rather than secondhand vendor blog posts. Where a stat has a known caveat, we say so.

  1. [1]Optimal subject length

    Gong x 30MPC Cold Email Data Report 2024 (85M+ emails, via Salesloft and Lavender data): 1 to 4 words performs best; 2 words is optimal; going from 2 to 4 words drops reply rate 17.5%; one-word subjects get 87% higher reply. Backlinko's 12M-email link-building study finds 36-50 char subjects win, but that dataset is link-building outreach, not B2B sales.

    Gong x 30MPC Cold Email Data Report 2024 · 2024Source
  2. [2]Subject anti-patterns

    Lavender dataset on subject-line anti-patterns: numbers in subject -46.33% open likelihood; punctuation -36%; questions -56%; first names in subject -12% replies; not using title case -30% opens.

    Lavender Cold Email Benchmark Report · 2024Source
  3. [3]Personalized subject

    Personalized cold email subject lines deliver 26 to 30.5% higher open rate across SalesHandy 2024, Snov.io 2026, and Lemlist data. Salesloft sentiment research finds neutral, descriptive tone gets the most replies.

    SalesHandy 2024; Snov.io 2026; Lemlist · 2024Source
  4. [4]Cold reply baseline

    Instantly Cold Email Benchmark Report 2026 (billions of emails sent Jan to Dec 2025): 3.43% platform-wide cold email reply rate. Top 25% of senders achieve 5.5%+; the elite top 10% reach 10.7%+.

    Instantly Cold Email Benchmark Report 2026 · 2026Source

Cold Email Subject Line Generator FAQ

Why are short subjects better for cold email?+
What about Backlinko's '36 to 50 character subjects win' finding?+
Why no numbers, punctuation, or questions in the output?+
Will this work for follow-up emails too?+
How does Satellyte change subject-line strategy?+

Stop testing subject lines. Test signals.

Subject A/B tests live in the noise floor. The biggest open-rate lever is whether you message during a buying signal at all.

FAQs

What signals does Satellyte actually track?+
Is this just another automated message blaster?+
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