The machine, in public
Grade my cold email.
Paste the email you are about to send. The rule-set we trained on 4,000,000 sends scores it and says exactly what would get it deleted. Free, instant, and nothing you paste is stored.
Questions
What it is, and what it is not.
What does the cold email checker actually check?
The same mechanical rules our own copy passes before a sequence ships: sentence count against the five-sentence ceiling, body length against the under-40-words band, subject line length and clichés, researched merge fields against the two-to-six plateau, reading grade against a 6.0 ceiling, machine-writing tells like the em dash, and the phrases that read as template — synergies, quick question, hope this finds you well, and their relatives.
Is my email stored or used for training?
No. The email is scored in memory and the response is computed and forgotten. Nothing you paste is stored, logged, or added to any corpus.
Where do the rules come from?
From more than 4,000,000 cold emails we sent over three years and what came back. Two findings carry measured effect sizes: emails over five sentences convert about 30% worse (measured across 32 client accounts), and first touches under 40 words converted at roughly double the rate of 40-to-69-word emails (across 44 clients). The rest is mechanical hygiene, labelled as such.
Is the score a prediction of my reply rate?
No, and anyone who tells you otherwise is selling something. Copy explains a small share of conversion variance; the offer, the list and the deliverability carry the rest. The score tells you what would get the email deleted before it was read. It cannot tell you your offer is good.
Does it test subject lines too?
Yes. The subject line is scored separately: word count against the three-to-five-word band, all-caps and fake-Re: detection, and the subject clichés every prospect has already deleted this week.